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Sysmon Timestamp Manipulator & Some Changes #785

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Sysmon Timestamp Manipulator & Some Changes #785

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62049d6
Added sysmon timestamp manipulation function and some changes on mani…
Jan 4, 2023
0a450ef
Update replay.py
krdmnbrk Jan 5, 2023
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100 changes: 96 additions & 4 deletions bin/replay.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,12 @@
class DataManipulation:

def manipulate_timestamp(self, file_path, sourcetype, source):
source = source.lower()
sourcetype = sourcetype.lower()

# check that we support the source or sourcetype sent for manipulation
SUPPORTED = ['WinEventLog:System', 'WinEventLog:Security', 'exchange', 'aws:cloudtrail']
SUPPORTED = ['XmlWinEventLog:Microsoft-Windows-Sysmon/Operational', 'WinEventLog:System', 'WinEventLog:Security', 'exchange', 'aws:cloudtrail']
SUPPORTED = list(map(lambda x: x.lower(), SUPPORTED))
if (sourcetype in SUPPORTED) or (source in SUPPORTED):
print("updating timestamps before replaying for file: {0}".format(file_path))
else:
Expand All @@ -25,8 +29,11 @@ def manipulate_timestamp(self, file_path, sourcetype, source):
if sourcetype == 'aws:cloudtrail':
self.manipulate_timestamp_cloudtrail(file_path)

if source == 'WinEventLog:System' or source == 'WinEventLog:Security':
if source == 'WinEventLog:System'.lower() or source == 'WinEventLog:Security'.lower():
self.manipulate_timestamp_windows_event_log_raw(file_path)

if source == 'XmlWinEventLog:Microsoft-Windows-Sysmon/Operational'.lower():
self.manipulate_timestamp_windows_sysmon_log_raw(file_path)

if source == 'exchange':
self.manipulate_timestamp_exchange_logs(file_path)
Expand Down Expand Up @@ -78,6 +85,93 @@ def manipulate_timestamp_windows_event_log_raw(self, file_path):
f.close()
return

def manipulate_timestamp_windows_sysmon_log_raw(self, file_path):
with open(file_path, "r", encoding="utf-8") as f:
content = f.read()

regex4systemTime = r'\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}' # <TimeCreated SystemTime="2021-04-05T14:11:22.091374000Z"/>
regex4utcTime = r'\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3}' # <Data Name="UtcTime">2021-04-05 14:11:22.089</Data>

format4systemTime = "%Y-%m-%dT%H:%M:%S"
format4utcTime = "%Y-%m-%d %H:%M:%S.%f"

systemTimes = re.findall(regex4systemTime, content)
utcTimes = re.findall(regex4utcTime, content)

systemTimes.sort()
utcTimes.sort()

# Difference for systemTime
now = datetime.now().strftime(format4systemTime)
now = datetime.strptime(now, format4systemTime)
last_event_time = datetime.strptime(systemTimes[-1],format4systemTime)
time_difference_4_systemTime = now - last_event_time

# Difference for utcTime
now = datetime.now().strftime(format4utcTime)
now = datetime.strptime(now, format4utcTime)
last_event_time = datetime.strptime(utcTimes[-1],format4utcTime)
time_difference_4_utcTime = now - last_event_time

# re.sub replacement function for systemTimes
def replacement_func_4_systemTime(m):
updated_systemTime = datetime.strptime(m.group(), format4systemTime) + time_difference_4_systemTime
updated_systemTime = updated_systemTime.strftime(format4systemTime)
return updated_systemTime

# re.sub replacement function for utcTimes
def replacement_func_4_utcTime(m):
updated_utcTime = datetime.strptime(m.group(), format4utcTime) + time_difference_4_utcTime
updated_utcTime = updated_utcTime.strftime(format4utcTime)
return updated_utcTime


content = re.sub(regex4systemTime, replacement_func_4_systemTime, content)
content = re.sub(regex4utcTime, replacement_func_4_utcTime, content)
with open('regex.log', 'w+', encoding='utf8') as write_file:
write_file.write(file_path)
print("Timestamps successfully updated.")

def manipulate_timestamp_cloudtrail(self, file_path):
f = io.open(file_path, "r", encoding="utf-8")

try:
first_line = f.readline()
d = json.loads(first_line)
latest_event = datetime.strptime(d["eventTime"],"%Y-%m-%dT%H:%M:%S.%fZ")

now = datetime.now()
now = now.strftime("%Y-%m-%dT%H:%M:%S.%fZ")
now = datetime.strptime(now,"%Y-%m-%dT%H:%M:%S.%fZ")
except ValueError:
first_line = f.readline()
d = json.loads(first_line)
latest_event = datetime.strptime(d["eventTime"],"%Y-%m-%dT%H:%M:%SZ")

now = datetime.now()
now = now.strftime("%Y-%m-%dT%H:%M:%SZ")
now = datetime.strptime(now,"%Y-%m-%dT%H:%M:%SZ")

difference = now - latest_event
f.close()

for line in fileinput.input(file_path, inplace=True):
try:
d = json.loads(line)
original_time = datetime.strptime(d["eventTime"],"%Y-%m-%dT%H:%M:%S.%fZ")
new_time = (difference + original_time)

original_time = original_time.strftime("%Y-%m-%dT%H:%M:%S.%fZ")
new_time = new_time.strftime("%Y-%m-%dT%H:%M:%S.%fZ")
print (line.replace(original_time, new_time),end ='')
except ValueError:
d = json.loads(line)
original_time = datetime.strptime(d["eventTime"],"%Y-%m-%dT%H:%M:%SZ")
new_time = (difference + original_time)

original_time = original_time.strftime("%Y-%m-%dT%H:%M:%SZ")
new_time = new_time.strftime("%Y-%m-%dT%H:%M:%SZ")
print (line.replace(original_time, new_time),end ='')

def replacement_function(self, match):
try:
Expand All @@ -88,8 +182,6 @@ def replacement_function(self, match):
print("ERROR - in timestamp replacement occured: " + str(e))
return match.group()


def manipulate_timestamp_cloudtrail(self, file_path):
f = io.open(file_path, "r", encoding="utf-8")

try:
Expand Down