-
Notifications
You must be signed in to change notification settings - Fork 42
/
droidsample.py
1075 lines (926 loc) · 52.7 KB
/
droidsample.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/usr/bin/env python
"""
__author__ = "Axelle Apvrille"
__license__ = "MIT License"
"""
import hashlib
import base64
import os
import re
import sys
import string
import struct
import zlib
import shutil
import subprocess
import xml.dom.minidom
import droidutil
import droidlysis3
import droidconfig
import droidcountry
import droidproperties
import droidziprar
import droidurl
import xml.parsers.expat as expat
import logging
logging.basicConfig(format='%(levelname)s:%(filename)s:%(message)s',
level=logging.INFO)
class droidsample:
# Base class for an Android sample to analyze
def __init__(self,
config,
filename,
output='/tmp/analysis',
verbose=False,
clear=False,
disable_description=False,
silent=False,
no_kit_exception=False,
import_exodus=False):
# Setup analysis of a given sample.
# This does not perform the analysis in itself
assert filename is not None, "Filename is invalid"
self.config = config
self.absolute_filename = filename
self.clear = clear
# we need those for recursive calls to process_file
self.disable_description = disable_description
self.silent = silent
self.no_kit_exception = no_kit_exception
self.ziprar = None # zip file or rar file file handle
self.verbose = verbose
if verbose:
logging.getLogger().setLevel(logging.DEBUG)
sanitized_basename = droidutil.sanitize_filename(
os.path.basename(filename))
self.properties = droidproperties.droidproperties(
config=self.config,
samplename=sanitized_basename,
sha256=droidutil.sha256sum(filename),
verbose=verbose,
import_exodus=import_exodus)
logging.debug("SHA256: %s" % (self.properties.sha256))
"""Computing the SHA1 of a file is only useful to help out the analyst.
The digest is written to the automatic analysis/description
of the sample. That description is located in the output analysis
directory, so obviously, if the end-user specifies he wants
the output analysis directory erased, he obviously
does not want to know about the SHA1 digest, and
thus it's useless to compute it."""
if not clear:
sha1 = droidutil.sha1sum(filename)
logging.debug("SHA1: %s" % (sha1))
# Creating the output analysis directory
self.outdir = os.path.join(output, '{filename}-{hash}'.format(
filename=sanitized_basename,
hash=self.properties.sha256))
logging.debug("Output dir: " + self.outdir)
if os.path.exists(self.outdir):
try:
shutil.rmtree(self.outdir,
ignore_errors=droidutil.on_rm_tree_error)
os.makedirs(self.outdir)
except RuntimeError:
logging.debug("Failed to remove directory RuntimeError")
else:
os.makedirs(self.outdir)
# standard output for shell commands
if self.verbose:
self.process_output = None
else:
self.process_output = open("/dev/null", 'w')
def close(self):
if self.process_output is not None:
self.process_output.close()
def unzip(self):
"""
This method will unzip/unrar the sample,
and recursively unzip/unrar inner zips/rars.
If we are not removing the analysis directory
(clearoutput option), then we also
unzip the sample in outdir/unzipped subdirectory.
If the sample is password protected,
we try 'infected' as password.
Returns the file type of the sample: droidutil
<FILE CONSTANT> (UNKNOWN, APK, DEX, ...)
"""
logging.debug("------------- Unzipping %s" % (self.absolute_filename))
self.properties.filetype = droidutil.get_filetype(
self.absolute_filename)
if self.properties.filetype == droidutil.ARM or \
self.properties.filetype == droidutil.UNKNOWN or \
self.properties.filetype == droidutil.DEX:
logging.debug("This is a %s. Nothing to unzip for %s"
% (droidutil.str_filetype(self.properties.filetype),
self.absolute_filename))
return self.properties.filetype
if self.properties.filetype == droidutil.ZIP or \
self.properties.filetype == droidutil.RAR:
if self.properties.filetype == droidutil.ZIP:
self.ziprar = droidziprar.droidziprar(
self.absolute_filename,
zipmode=True, verbose=self.verbose)
else:
self.ziprar = droidziprar.droidziprar(
self.absolute_filename,
zipmode=False, verbose=self.verbose)
if self.ziprar.handle is None:
self.properties.filetype = droidutil.UNKNOWN # damaged zip/rar
logging.debug("Unable to unzip/unrar %s because of errors"
% self.absolute_filename)
return droidutil.UNKNOWN
# Now, we know self.ziprar is valid and open.
self.properties.filetype, innerzips = self.ziprar.get_type()
if innerzips:
self.properties.file_innerzips = True
logging.debug("There are inner zips/rars in "
+ self.absolute_filename)
for element in innerzips:
# extract the inner zip/rar
logging.debug("Extracting " + element
+ " inside " + self.absolute_filename)
try:
self.ziprar.extract_one_file(element, self.outdir)
logging.debug("Recursively processing "
+ os.path.join(self.outdir, element))
# TODO: this is probably buggy: we
# should be providing enable_sql too etc.
droidlysis3.process_file(
os.path.join(self.outdir, element),
self.outdir, self.verbose, self.clear,
self.disable_description,
self.no_kit_exception)
except:
logging.warning("Cannot extract %s : %s"
% (element, sys.exc_info()[0]))
if self.properties.filetype == droidutil.APK:
# our zip actually is an APK
if not self.clear:
# let's unzip
logging.debug("Unzipping " +
self.absolute_filename
+ " to " + os.path.join(self.outdir, 'unzipped'))
try:
self.ziprar.extract_all(
outdir=os.path.join(self.outdir, 'unzipped'))
except:
logging.warning("Unzipping failed (catching exception): %s"
% (sys.exc_info()[0]))
return self.properties.filetype
def disassemble(self):
"""
Disassembles the sample (as much as possible),
and if the end-user is interested in output (clear unset)
also decompiles it (as much as possible).
APK:
java -jar apktool.jar [-q] d file.apk outdir/apktool
if apktool failed
java -jar baksmali.jar -o outdir/smali classes.dex in file.apk
if clear unset,
unzip file.apk -d outdir/unzipped
else
just unzip META-INF/
DEX:
java -jar baksmali.jar -o outdir/smali classes.dex
if clear unset,
make sure classes.dex is readable
dex2jar classes.dex -o classes-dex2jar.jar
unzip -qq classes-dex2jar.jar -d outdir/unjarred
What we'll find:
APK, clear unset: ./smali AndroidManifest.xml ./unzipped classes.dex classes-dex2jar.jar ./unjarred
APK, clear set : ./smali AndroidManifest.xml classes.dex
DEX, clear unset: classes.dex ./smali
DEX, clear set : classes.dex ./smali classes-dex2jar.jar ./unjarred
"""
logging.debug("------------- Disassembling")
if self.properties.filetype == droidutil.ARM or \
self.properties.filetype == droidutil.RAR or \
self.properties.filetype == droidutil.CLASS or \
self.properties.filetype == droidutil.UNKNOWN:
logging.debug("Nothing to disassemble for "
+ self.absolute_filename)
return
if self.properties.filetype == droidutil.APK:
# APKTOOL won't output to an existing
# dir unless you use the -f switch. But then, -f erases the contents
# of the output dir... So we can't do this directly on self.outdir
apktool_outdir = os.path.join(self.outdir, "apktool")
logging.debug("Running apktool on inputfile="
+ self.absolute_filename)
if self.verbose:
logging.debug("Apktool command: java -jar %s d -f %s %s"
% (self.config.APKTOOL_JAR,
self.absolute_filename, apktool_outdir))
subprocess.call(["java", "-jar", self.config.APKTOOL_JAR,
"d", "-f", self.absolute_filename,
"-o", apktool_outdir])
else:
# with quiet option
subprocess.call(["java", "-jar", self.config.APKTOOL_JAR,
"-q", "d", "-f", self.absolute_filename,
"-o", apktool_outdir],
stdout=self.process_output,
stderr=self.process_output)
if os.path.isdir(apktool_outdir):
droidutil.move_dir(apktool_outdir, self.outdir)
# we want all smali_classes? dir in smali
if os.path.exists(os.path.join(self.outdir, "smali_classes2")):
# we have multidex - we are going to move
# all smali classes in the same directory
logging.debug("Moving multidex smali classes to ./smali")
os.system("cp -R "
+ os.path.join(self.outdir, "./smali_classes*/*")
+ " " + os.path.join(self.outdir, "./smali"))
os.system("rm -r "
+ os.path.join(self.outdir, "./smali_classes*"))
if self.verbose:
logging.debug("Apktool finished")
# extract classes.dex whatever happens, we'll use it
logging.debug("Extracting classes*.dex")
try:
self.ziprar.extract_one_file('classes.dex', self.outdir)
for i in range(2, 1000):
self.ziprar.extract_one_file('classes{}.dex'.format(i), self.outdir)
if not os.path.exists(os.path.join(self.outdir, 'classes{}.dex'.format(i))):
break
self.properties.smali['multidex'].append('classes{}.dex'.format(i))
except:
logging.debug("Extracting classes.dex failed: %s" % (sys.exc_info()[0]))
logging.warning("Extracting classes.dex failed")
# Disassemble the DEX(es)
dex_files = []
if self.properties.filetype == droidutil.DEX:
dex_files.append(self.absolute_filename)
else:
if len(self.properties.smali['multidex']) > 0:
for d in self.properties.smali['multidex']:
dex_files.append(os.path.join(self.outdir, d))
else:
dex_files.append(os.path.join(self.outdir, 'classes.dex'))
smali_dir = os.path.join(self.outdir, 'smali')
if (not os.access(smali_dir, os.R_OK) or
(os.access(smali_dir, os.R_OK) and not os.listdir(smali_dir))):
# we only do this if apktool didn't baksmali correctly
for d in dex_files:
if os.access(d, os.R_OK):
logging.debug("Baksmali on {} -> {}".format(d, smali_dir))
try:
subprocess.call(["java", "-jar", self.config.BAKSMALI_JAR,
"d", "-o", smali_dir, d],
stdout=self.process_output, stderr=self.process_output)
except:
logging.warning("[-] Baksmali failed for {}".format(d))
# Decompile the DEX(es)
logging.debug("------------- Decompiling")
if not self.clear:
for d in dex_files:
if os.access(d, os.R_OK):
jar_file = os.path.join(self.outdir, '{}-dex2jar.jar'.format(
os.path.splitext(os.path.basename(d))[0]))
if os.access(self.config.DEX2JAR_CMD, os.X_OK):
if self.verbose:
logging.debug("Dex2jar on " + d)
try:
subprocess.call([self.config.DEX2JAR_CMD, "--force", d, "-o", jar_file],
stdout=self.process_output, stderr=self.process_output)
except:
logging.warning("[-] Dex2jar failed on {}".format(d))
else:
logging.warning("Dex2jar software is not executable, skipping (file: {0})".format(self.config.DEX2JAR_CMD))
if os.access(jar_file, os.R_OK):
logging.debug("Unjarring " + jar_file)
jarziprar = droidziprar.droidziprar(jar_file, zipmode=True, verbose=self.verbose)
if jarziprar.handle is None:
logging.debug("Bad Jar / Failed to unjar " + jar_file)
else:
try:
jarziprar.extract_all(os.path.join(self.outdir, 'unjarred'))
except:
logging.warning("Failed to unjar: %s" % (sys.exc_info()[0]))
jarziprar.close()
# Convert binary Manifest
if self.properties.filetype == droidutil.APK:
manifest = os.path.join(self.outdir, 'AndroidManifest.xml')
if not os.access(manifest, os.R_OK) or os.path.getsize(manifest) == 0:
try:
logging.debug( "Extracting binary AndroidManifest.xml")
self.ziprar.extract_one_file('AndroidManifest.xml', self.outdir)
if os.access( manifest, os.R_OK) and os.path.getsize(manifest) > 0:
textmanifest = os.path.join( self.outdir, 'AndroidManifest.text.xml')
subprocess.call( [ "androaxml.py", "--input", manifest, \
"--output", textmanifest ], \
stdout=self.process_output, stderr=self.process_output)
if os.access( textmanifest, os.R_OK ):
# overwrite the binary manifest with the converted text one
os.rename(textmanifest, manifest)
except AssertionError:
logging.warning("Failed to extract binary manifest: %s" % (sys.exc_info()[0]))
except FileNotFoundError:
logging.warning("Error while unzipping or Androguard not installed (no androaxml.py)")
def extract_file_properties(self):
"""Extracts file size,
nb of dirs and classes in smali dir"""
logging.debug("------------- Extracting file properties")
self.properties.file_size = os.stat(self.absolute_filename).st_size
if self.properties.file_size < 70000:
self.properties.file_small = True
smali_dir = os.path.join(self.outdir, "smali")
if os.access(smali_dir, os.R_OK):
self.properties.file_nb_dir, self.properties.file_nb_classes = droidutil.count_filedirs(smali_dir)
logging.debug("Filesize: %d" % (self.properties.file_size))
logging.debug("Is Small: %d" % (self.properties.file_small))
logging.debug("Nb Class: %d" % (self.properties.file_nb_classes))
logging.debug("Nb Dir : %d" % (self.properties.file_nb_dir))
def extract_meta_properties(self):
"""Extracting meta-data related to APK's signature timestamp and signing certificate"""
if self.properties.filetype == droidutil.APK:
self.properties.certificate['timestamp'] = self.ziprar.get_date('META-INF/MANIFEST.MF')
if self.properties.certificate['timestamp'] != None:
self.properties.certificate['year'] = self.properties.certificate['timestamp'][0]
logging.debug("APK timestamp: %d" % (self.properties.certificate['timestamp'][0]))
# extract properties from the certificate
logging.debug("------------- Extracting properties from certificate")
list = []
try:
list = self.ziprar.extract_pattern(self.outdir, 'META-INF/.*\.RSA')
if not list:
list = self.ziprar.extract_pattern(self.outdir, 'META-INF/.*\.DSA')
except:
logging.debug("Error at extraction: %s" % (sys.exc_info()[0]))
if list:
try:
keyout = subprocess.check_output([self.config.KEYTOOL, "-printcert", "-file",
os.path.join(self.outdir, list[0])],
stderr=self.process_output).decode('utf-8')
keyout = re.sub(': ', '#', keyout)
keyout = re.sub('\t| ', '', keyout)
keyout = re.sub('until#', '\nUntil#', keyout)
keysplit = re.split('#|\n', keyout)
try:
index = keysplit.index("Owner")
self.properties.certificate['owner'] = keysplit[index+1]
logging.debug("Certificate Owner: "+self.properties.certificate['owner'])
self.extract_certificate_owner_properties(self.properties.certificate['owner'])
except ValueError:
logging.debug("Certificate Owner not present")
try:
index = keysplit.index("Serialnumber")
self.properties.certificate['serialno'] = keysplit[index+1]
logging.debug("Certificate Serial no: "+self.properties.certificate['serialno'])
# detect typical dev certificate
if re.search('936eacbe07f201df', self.properties.certificate['serialno'], re.IGNORECASE):
self.properties.certificate['dev'] = True
logging.debug("Dev certificate detected")
except ValueError:
logging.debug("Serial number not present")
try:
index = keysplit.index("Signaturealgorithmname")
self.properties.certificate['algo'] = keysplit[index+1]
logging.debug("Algo: "+self.properties.certificate['algo'])
except ValueError:
logging.debug("Signature algorithm name not present")
except subprocess.CalledProcessError as e:
logging.debug("Caught CalledProcessError: ", e.output)
logging.debug("Probably an invalid certificate")
else:
logging.debug("No certificate found")
def extract_certificate_owner_properties(self, owner):
# owner should not be null
m = re.search('C=(\w*)', owner, re.IGNORECASE)
if m is not None:
cert_country = m.group(0)[2:]
if re.search('Unknown', cert_country, re.IGNORECASE):
self.properties.certificate['unknown_country'] = True
else:
self.properties.certificate['country'] = droidcountry.to_int(cert_country)
logging.debug("Certificate Country = %s (%d)" % (cert_country, self.properties.certificate['country']))
# Debug certificate
m = re.search('OU=Android O=Android L=Mountain View', owner, re.IGNORECASE)
if m is not None:
self.properties.certificate['debug'] = True
# AV owner
av_list = ('O=www.netqin.com',
'OU=Symantec',
'CN=Fortinet Android OU=Android O=Fortinet L=Burnaby ST=British Columbia C=BC',
'OU=Engineering O=Webroot Software Inc L=Boulder ST=Colorado C=US|CN=James Burgess',
'OU=Mobile Security, O=Flexilis, L=Los Angeles, ST=CA, C=US|O=Sophos Ltd. L=Abingdon C=UK',
'OU=Application Development O=G Data Software AG L=Bochum ST=NRW C=DE',
'CN=VIRUSTOTAL OU=VIRUSTOTAL O=VIRUSTOTAL L=Malaga ST=Malaga C=ES',
'CN=Qihoo OU=Qihoo 360 Technology Co Ltd O=Qihoo 360 Technology Co Ltd L=Chaoyang ST=Beijing C=CN',
'CN=KAIDI,OU=KAIDI,O=KAIDI,L=Beijing,ST=Beijing,C=86',
'EMAILADDRESS=android\@avast.com CN=avast! Android O=AVAST Software a.s. L=Prague ST=Prague C=CZ')
for av in av_list:
m = re.search(av, owner, re.IGNORECASE)
if m is not None:
if self.verbose:
print("Certificate owner matches AV : "+m.group(0))
self.properties.certificate['av'] = True
# Companies
famous_list = ('CN=Android OU=Android O=Google Inc\. L=Moutain View ST=California C=US',
'O=Rovio Mobile Ltd L=Helsinki C=FI',
'CN=Facebook Corporation OU=Facebook O=Facebook Mobile L=Palo Alto ST=CA C=US')
for f in famous_list:
m = re.search(f, owner, re.IGNORECASE)
if m is not None:
logging.debug("Certificate owner matches Famous : "+m.group(0))
self.properties.certificate['famous'] = True
def is_packed(self):
"""
We assume a sample is packed if the main activity its manifest references cannot be found in the DEX
+ DexClassLoader or Dex File
This test is far from perfect
"""
smali_dir = os.path.join(self.outdir, 'smali')
missing = False
if self.properties.manifest['main_activity'] is not None:
filename = os.path.join(smali_dir, self.properties.manifest['main_activity'].replace('.', os.path.sep)
.replace('\'', '') + '.smali')
if not os.access(filename, os.R_OK):
logging.debug("Unable to find Main Activitity: {} filename={}".format(self.properties.manifest['main_activity'],
filename))
missing = True
if missing and (self.properties.smali['dex_class_loader'] or self.properties.smali['dex_file'] or self.properties.smali['load_library'] or self.properties.smali['class_loader']):
self.properties.smali['packed'] = True
def extract_manifest_properties(self):
"""Extracting services, receivers, activities etc from manifest"""
manifest = os.path.join(self.outdir, 'AndroidManifest.xml')
if self.properties.filetype == droidutil.APK and os.access(manifest, os.R_OK) and os.path.getsize(manifest)>0:
try:
xmldoc = xml.dom.minidom.parse(manifest)
except expat.ExpatError:
logging.debug("XML parsing error")
return
# getting package's name
self.properties.manifest['package_name'] = xmldoc.documentElement.getAttribute('package')
tab = droidutil.get_elements(xmldoc, 'service', 'android:name')
tab.extend(droidutil.get_elements(xmldoc, 'service', 'obfuscation:name'))
for t in tab:
name = re.sub(r"u'(?P<name>.*)'", r"\g<name>", t)
if name != "''":
self.properties.manifest['services'].append(name)
tab = droidutil.get_elements(xmldoc, 'receiver', 'android:name')
tab.extend(droidutil.get_elements(xmldoc, 'receiver', 'obfuscation:name'))
for t in tab:
name = re.sub(r"u'(?P<name>.*)'", r"\g<name>", t)
if name != "''":
self.properties.manifest['receivers'].append(name)
tab = droidutil.get_elements(xmldoc, 'activity', 'android:name')
tab.extend(droidutil.get_elements(xmldoc, 'activity', 'obfuscation:name'))
for t in tab:
name = re.sub(r"u'(?P<name>.*)'", r"\g<name>", t)
if name != "''":
self.properties.manifest['activities'].append(name)
tab = droidutil.get_elements(xmldoc, 'provider', 'android:name')
tab.extend(droidutil.get_elements(xmldoc, 'provider', 'obfuscation:name'))
for t in tab:
name = re.sub(r"u'(?P<name>.*)'", r"\g<name>", t)
if name != "''":
self.properties.manifest['providers'].append(name)
tab = droidutil.get_elements(xmldoc, 'uses-library', 'android:name')
for t in tab:
self.properties.manifest['libraries'].append(re.sub(r"u'(?P<nom>.*)'", r"\g<nom>", t))
tab = droidutil.get_elements(xmldoc, 'uses-permission', 'android:name')
tab.extend(droidutil.get_elements(xmldoc, 'uses-permission', 'obfuscation:name'))
for t in tab:
name = t.replace('android.permission.','').replace("u'", '').replace("'", '')
if name != '':
self.properties.manifest['permissions'].append(name)
tab = droidutil.get_elements(xmldoc, 'application', 'obfuscation:name')
tab.extend(droidutil.get_elements(xmldoc, 'application', 'android:name'))
for t in tab:
if 'multidex' in t:
self.properties.manifest['multidex'] = True
break
self.properties.manifest['maxSDK'] = droidutil.get_element(xmldoc, 'uses-sdk', 'android:maxSdkVersion')
self.properties.manifest['minSDK'] = droidutil.get_element(xmldoc, 'uses-sdk', 'android:minSdkVersion')
self.properties.manifest['targetSDK'] = droidutil.get_element(xmldoc, 'uses-sdk', 'android:targetSdkVersion')
tab = droidutil.get_elements(xmldoc, 'meta-data', 'android:name')
if self.verbose:
logging.debug('meta-data: ' + ''.join(tab))
for t in tab:
if 'android.content.ContactDirectory' in t:
self.properties.manifest['auto_load'] = True
if self.verbose:
logging.debug('Suspicious ContactDirectory meta-data trick')
break
if self.verbose:
logging.debug("MinSDK=%s MaxSDK=%s TargetSDK=%s" % (self.properties.manifest['minSDK'],
self.properties.manifest['maxSDK'],
self.properties.manifest['targetSDK']))
for perm in self.properties.manifest['permissions']:
logging.debug("Requires permission " + perm)
# get main activity
for actitem in xmldoc.getElementsByTagName('activity'):
for a in actitem.getElementsByTagName('action'):
if a.getAttribute( 'android:name') == 'android.intent.action.MAIN' \
or a.getAttribute('obfuscation:name') == 'android.intent.action.MAIN':
for b in actitem.getElementsByTagName('category'):
if b.getAttribute('android:name') == 'android.intent.category.LAUNCHER'\
or b.getAttribute('obfuscation:name') == 'android.intent.category.LAUNCHER':
if actitem.getAttribute('android:name') != '':
self.properties.manifest['main_activity'] = actitem.getAttribute('android:name')
else:
self.properties.manifest['main_activity'] = actitem.getAttribute('obfuscation:name')
if self.verbose and self.properties.manifest['main_activity'] is not None:
logging.debug("Main activity: " + self.properties.manifest['main_activity'])
# search for swf
metalist = droidutil.get_elements(xmldoc, 'meta-data', 'android:value')
for item in metalist:
if re.search('\.swf', item):
self.properties.manifest['swf'] = True
# get sms listener
for r in xmldoc.getElementsByTagName('receiver'):
for i in r.getElementsByTagName('intent-filter'):
for a in i.getElementsByTagName('action'):
if a.getAttribute('android:name') == 'android.provider.Telephony.SMS_RECEIVED':
self.properties.manifest['listens_incoming_sms'] = True
if a.getAttribute('android:name') == 'android.intent.action.NEW_OUTGOING_CALL':
self.properties.manifest['listens_outgoing_call'] = True
logging.debug("Listens to incoming SMS : %d" % (self.properties.manifest['listens_incoming_sms']))
logging.debug("Listens to outgoing calls: %d" % (self.properties.manifest['listens_outgoing_call']))
def extract_kit_properties(self):
"""
Detects which kits are present in the sample currently analyzed
Returns something like: ['apperhand', 'jackson', 'applovin', 'leadbolt', 'airpush']
"""
list = []
if self.properties.filetype == droidutil.APK or self.properties.filetype == droidutil.DEX:
smali_dir = os.path.join(self.outdir, "smali")
if os.access(smali_dir, os.R_OK):
for section in self.properties.kitsconfig.get_sections():
pattern_list = self.properties.kitsconfig.get_pattern(section).split('|')
for pattern in pattern_list:
for root, dirs, fname in os.walk(smali_dir):
if pattern in root:
logging.debug("kits[%s] = True (detected pattern: %s)" % (section, pattern))
list.append(section)
self.properties.kits[section] = True
break # break one level
if self.properties.kits[section] is True:
break # break another level
return list
def extract_dex_properties(self):
"""Extracts information at DEX level. Requires read access to the DEX file. """
if self.properties.filetype == droidutil.APK or self.properties.filetype == droidutil.DEX:
if self.properties.filetype == droidutil.DEX:
dex_file = self.absolute_filename
else:
dex_file = os.path.join(self.outdir, 'classes.dex')
if os.access(dex_file, os.R_OK) and os.stat(dex_file).st_size > 0:
file = open(dex_file, 'rb')
magic = file.read(8)
self.properties.dex['magic_unknown'] = True
if magic[0:3] == 'dey':
self.properties.dex['odex'] = True
for i in range(35, 39):
if magic[4:7] == (b'0%d' % i):
self.properties.dex['magic'] = i
self.properties.dex['magic_unknown'] = False
logging.debug("DEX Magic: %s" % (repr(magic)))
checksum = file.read(4)
sha1 = file.read(20)
# check sha1 of file
if sha1 != '':
computed_sha1 = hashlib.sha1(file.read()).hexdigest()
if sha1.hex() != computed_sha1:
self.properties.dex['bad_sha1'] = True
logging.debug("DEX SHA1 read : %s" % sha1.hex())
logging.debug("DEX SHA1 computed: %s" % computed_sha1)
else:
logging.debug("Impossible to read file's SHA1 => impossible to check")
# check checksum
if checksum != '':
file.seek(8+4, 0) # 0 = from beginning, skip magic and checksum
computed_adler32 = zlib.adler32(file.read()) & 0xffffffff # beware, adler32 returns an INTEGER
if computed_adler32 != struct.unpack("<I", checksum)[0]: # converting both numbers to integers
self.properties.dex['bad_adler32'] = True
logging.debug("DEX checksum read : %s (reverse order)" % (checksum.hex()))
logging.debug("DEX checksum computed: %s" % (hex(computed_adler32)))
else:
logging.debug("Impossible to read file's checksum => impossible to check")
# check header size
file.seek(8+4+20+4, 0)
header_size = struct.unpack("<I", file.read(4))[0]
if header_size > 0x70:
logging.debug("DEX header is bigger than expected: %d (HoseDex2Jar?)" % header_size)
self.properties.dex['big_header'] = True
# look for 0 0x0 if-eq v0, v0, +9
# 1 0x4 fill-array-data v0, +3 (0x7)
# 2 0xa fill-array-data-payload
# See http://www.dexlabs.org/blog/bytecode-obfuscation
file.seek(0x68, 0)
data_size = struct.unpack("<I", file.read(4))[0]
data_offset = struct.unpack("<I", file.read(4))[0]
file.seek(data_offset, 0)
buffer = file.read(data_size)
fill_array_pattern = re.compile(b"\x32\x00\x09\x00\x26\x00\x03\x00\x00\x00")
match = fill_array_pattern.search(buffer)
if match is not None:
logging.debug("fill-array-data trick located at offset=%d" % (data_offset + match.start()))
# to print the matching string: ''.join( [ "%02X " % ord( x ) for x in buffer[match.start():match.end() ] ).strip()
self.properties.dex['thuxnder'] = True
file.close()
else:
logging.debug("Dex file %s is missing or empty" % dex_file)
def extract_smali_properties(self, list_of_kits):
if self.properties.filetype != droidutil.APK and\
self.properties.filetype != droidutil.DEX:
# no smali properties to extract in that type of file
return
logging.debug("------------- Extracting Smali properties")
smali_dir = os.path.join(self.outdir, 'smali')
if os.access(smali_dir, os.R_OK) and os.listdir(smali_dir) != []:
exceptions = []
for kit in list_of_kits:
pattern_list = self.properties.kitsconfig.get_pattern(kit).split('|')
for pattern in pattern_list:
if pattern is not None and pattern != '':
exceptions.append(pattern) # pattern may be part of a path so do not prefix with smali_dir
else:
logging.debug("WARNING: configuration file error: empty pattern for %s" % kit)
smali_regexp = self.properties.smaliconfig.get_all_regexp()
match = droidutil.recursive_search(smali_regexp, smali_dir, exceptions, False)
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
analysis_file.write('# Smali keywords\n')
analysis_file.close()
self.properties.smaliconfig.match_properties(match, self.properties.smali)
for mykey in match.keys():
'''if self.verbose:
for element in match[mykey]:
print("- keyword=%s detected: %s" % (mykey, str(element)))'''
if mykey.find('android_id') >= 0 and match[mykey]:
# this matches const-string v[0-9]*, "android_id"/'
self.properties.smali['android_id'] = True
if mykey.find('scp') >= 0 and mykey.find('const-string') >= 0 and match[mykey]:
# const-string v[0-9]*, ".*scp.*"
self.properties.smali['scp'] = True
if mykey.find('ssh') >= 0 and mykey.find('const-string') >= 0 and match[mykey]:
# const-string v[0-9]*, ".*ssh.*'
self.properties.smali['ssh'] = True
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
# let's not dump for nops
if not (mykey == ' nop'):
if match[mykey]:
analysis_file.write("## %s\n" % mykey)
for element in match[mykey]:
append = self.extract_method_name(str(element))
analysis_file.write("- "+append+str(element)+"\n")
analysis_file.write('\n')
analysis_file.close()
# test if sample is likely to be packed
self.is_packed()
else:
logging.debug("Cannot extract smali properties, because directory %s not found" % smali_dir)
# all smali properties should then be set to unknown
for key in sorted(self.properties.smali.keys()):
self.properties.smali[key] = 'unknown'
def extract_method_name(self, element):
m = re.findall(r'file=(.*?)\s+no=\s*(\d+)', element)
if m:
file_path, line_no = m[0]
with open(file_path, 'r') as f:
lines = f.readlines()
for i in range(int(line_no), 0, -1):
line = lines[i]
if line.startswith('.method'):
clazz = (lines[0].split(' ')[-1]).strip()
method = (line.split(' ')[-1]).strip()
return f'path={clazz}->{method} '
return ''
def extract_wide_properties(self, list_of_kits):
"""Will look for given properties (e.g GPS usage, presence of executables
in all subdirectories (smali, assets, resources, library...)"""
logging.debug("------------- Extracting Wide properties")
# detecting presence of ijiami packer
ijiami = os.path.join(self.outdir, 'unzipped/assets/ijiami.dat')
if os.access(ijiami, os.R_OK):
self.properties.wide['ijiami'] = True
# detecting Flutter debug mode
flutter_debug = os.path.join(self.outdir, 'unzipped/assets/flutter_assets/kernel_blob.bin')
if os.access(flutter_debug, os.R_OK):
self.properties.kits['flutter'] = True
# detecting react native framework using index.android.bundle
react_assets = os.path.join(self.outdir, 'unzipped/assets/index.android.bundle')
if os.access(react_assets, os.R_OK):
self.properties.wide['react_asset'] = True
# Run "file" to detect hermes bytecode version
proc = subprocess.Popen(['file', react_assets], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output = proc.communicate()[0]
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
analysis_file.write('# Hermes Bytecode version\n')
analysis_file.write(output.decode() + '\n')
analysis_file.close()
# detect executables in resources
self.find_exec_in_resources()
# other properties
if self.properties.filetype == droidutil.APK or self.properties.filetype == droidutil.DEX:
exceptions = []
for kit in list_of_kits:
pattern_list = self.properties.kitsconfig.get_pattern(kit).split('|')
for pattern in pattern_list:
exceptions.append(pattern)
exceptions.append("/unjarred")
exceptions.append("/unzipped")
exceptions.append("/unknown")
exceptions.append("classes.dex")
exceptions.append('details.md')
wide_regexp = self.properties.wideconfig.get_all_regexp()
match = droidutil.recursive_search(wide_regexp, self.outdir, exceptions, False)
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
analysis_file.write('# Keywords in resources, assets, lib\n\n')
analysis_file.close()
self.properties.wideconfig.match_properties(match, self.properties.wide)
for mykey in match.keys(): # remember mykey is the matched value not the pattern
if match[mykey]:
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
analysis_file.write("- "+str(mykey)+"\n")
analysis_file.close()
# put here keywords for which you need to do some processing on each match
# keep a list of phonenumbers we detect
# mykey will be the phonenumber
# International phone number detector
# actually, it should be \+[0-9]{1,3}[0-9]{1,14} but that
# generates too many false positives (numbers for other reasons)
# so I'm being conservative
if mykey.startswith('+') and self.properties.wide['has_phonenumbers']: # mykey.startswith('+') and
if re.search(b"\+[0-9]{1,3}[0-9]{10,14}", mykey):
self.properties.wide['phonenumbers'].append(mykey)
logging.debug("Phone number spotted: " + mykey)
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
analysis_file.write("- "+str(mykey)+"\n")
analysis_file.close()
# we want to process each potential URL and IP address
ip_pattern = re.compile("\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")
if ip_pattern.match(mykey):
logging.debug("IP address to check: {}".format(mykey))
self.interesting_url(mykey)
if mykey.find('http') >= 0 and match[mykey]:
self.interesting_url(mykey)
analysis_file = open(os.path.join(self.outdir, droidlysis3.property_dump_file), 'a')
analysis_file.write('\n\n')
analysis_file.close()
# detect base64 encoded string in resources
self.find_base64_strings(self.outdir, exceptions, self.properties.wide['base64_strings'])
# trying to grab the application's name
if not self.clear:
strings_file = os.path.join(self.outdir, "res/values/strings.xml")
if os.access(strings_file, os.R_OK):
xmldoc = xml.dom.minidom.parse(strings_file)
sitems = xmldoc.getElementsByTagName('string')
if sitems is None:
for item in sitems:
if item.hasAttributes():
if item.getAttribute('name') == 'app_name':
if item.hasChildNodes():
self.properties.app_name = item.childNodes[0].data
# rule out chinese characters: TODO: convert chinese characters to printable
self.properties.app_name = re.sub('[^:print:]', '', self.properties.app_name)
break
def extract_arm_properties(self, arm_filename=''):
"""Extracts properties from an ARM executable
Either call this on a sample which is an ARM file.
Or from within an embedded ARM file inside an APK.
"""
if self.properties.filetype == droidutil.ARM or arm_filename != '':
if arm_filename == '':
arm_filename = self.absolute_filename
logging.debug("Extracting properties from " + arm_filename)
# Run "strings" on the executable
proc = subprocess.Popen(['strings', arm_filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output = proc.communicate()
for section in self.properties.armconfig.get_sections():
matches = re.findall(self.properties.armconfig.get_pattern(section), output[0].decode('utf-8'))
if matches is not None and len(matches) > 0:
self.properties.arm[section] = True
logging.debug("Setting arm[%s] = True" % section)
if section == 'url_in_exec':
for m in matches:
self.interesting_url(m)
def find_executables(self, dir):
"""Finds executables in a given directory. Does not parse recursively.
Returns two lists:
- ARM executables list (absolute filename)
- APK executables list (absolute filename)
"""
assert os.path.isdir(dir), "argument should be a directory"
found_apk = []
found_arm = []
listing = os.listdir(dir)
for file in listing:
absolute_file = os.path.join(dir, file)
if os.path.isfile(absolute_file):
filetype = droidutil.get_filetype(absolute_file)
# Special case to detect Flutter apps compiled in release mode
if file == 'libapp.so':
self.properties.kits['flutter'] = True
if filetype == droidutil.ARM:
logging.debug("%s is an ARM executable" % absolute_file)
found_arm.append(absolute_file)
else:
if filetype == droidutil.ZIP:
innerzip = droidziprar.droidziprar(absolute_file, True, self.verbose)
if innerzip.handle is None:
logging.debug("%s is not a valid zip" % absolute_file)
return found_apk, found_arm
filetype = innerzip.get_type()
innerzip.close()
if filetype == droidutil.APK:
logging.debug("%s contains an APK" % absolute_file)
found_apk.append(absolute_file)
else:
if filetype == droidutil.RAR:
innerzip = droidziprar.droidziprar(absolute_file, False, self.verbose)
if innerzip.handle is None:
logging.debug("%s is not a valid rar" % absolute_file)
return found_apk, found_arm
filetype = innerzip.get_type()
innerzip.close()
if filetype == droidutil.APK:
logging.debug("%s contains an APK" % absolute_file)
found_apk.append(absolute_file)
return found_arm, found_apk
def find_exec_in_resources(self):
"""Will detect embedded executables or zips in assets, raw resources and lib dir"""
asset_dir = os.path.join(self.outdir, "assets")
raw_dir = os.path.join(self.outdir, "res/raw")
lib_dir = os.path.join(self.outdir, "lib/armeabi")
lib2_dir = os.path.join(self.outdir, "lib/arm64-v8a")
list_dir = [asset_dir, raw_dir, lib_dir, lib2_dir]
for dir in list_dir:
if os.access(dir, os.R_OK) and os.path.isdir(dir):
logging.debug("Parsing %s for embedded executables or zips... " % dir)
found_arm, found_apk = self.find_executables(dir)
if found_arm or found_apk:
self.properties.wide['embed_exec'] = True
logging.debug("Embedded executables/zip found in " + dir)
if found_arm:
for arm in found_arm:
logging.debug("Recursively processing " + arm)
self.extract_arm_properties(arm)
if found_apk:
for apk in found_apk:
logging.debug("Recursively processing " + apk)
droidlysis3.process_file(apk, self.outdir, self.verbose, self.clear,
disable_report=self.disable_description,
no_kit_exception=self.no_kit_exception)
def interesting_url(self, url):