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Mariusz B. / mgeeky 2021-10-17 21:24:20 +02:00
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8
phishing/README.md
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@ -1,13 +1,13 @@
## Phishing and Social-Engineering related scripts, tools and CheatSheets
- **`decode-spam-headers.py`** - This tool accepts on input an `*.EML` or `*.txt` file with all the SMTP headers. It will then extract a subset of interesting headers and will attempt to parse them.
- **`decode-spam-headers.py`** - This tool accepts on input an `*.EML` or `*.txt` file with all the SMTP headers. It will then extract a subset of interesting headers and using **35+** tests will attempt to decode them as much as possible.
This script also extracts all IPv4 addresses and domain names and performs full DNS resolution of them.
Resulting output will contain useful information on why this e-mail might have been blocked.
Processed headers:
Processed headers (more than **30+** headers are parsed):
- `Authentication-Results`
- `From`
@ -35,6 +35,10 @@
- `X-VR-SPAMCAUSE`
- `X-VR-SPAMSCORE`
- `X-Virus-Scanned`
- `X-Spam-Checker-Version`
- `X-IronPort-AV`
- `X-Mimecast-Spam-Score`
- `User-Agent`
- and more...
Most of these headers are not fully documented, therefore the script is unable to pinpoint all the details, but at least it collects all I could find on them.

337
phishing/decode-spam-headers.py
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@ -32,6 +32,10 @@
# - X-VR-SPAMCAUSE
# - X-VR-SPAMSCORE
# - X-Virus-Scanned
# - X-Spam-Checker-Version
# - X-IronPort-AV
# - X-Mimecast-Spam-Score
# - User-Agent
#
# Usage:
# ./decode-spam-headers [options] <smtp-headers.txt>
@ -241,16 +245,26 @@ class SMTPHeadersAnalysis:
)
Header_Keywords_That_May_Contain_Spam_Info = (
'spam',
'phishing',
'bulk',
'attack',
'spm',
'atp',
'defend',
'assassin',
'virus',
'scan'
'spam', 'phishing', 'bulk', 'attack', 'defend', 'assassin', 'virus', 'scan', 'mimecast',
'ironport', 'forefront', '360totalsecurity', 'acronis', 'adaware', 'adsbot-google',
'aegislab', 'ahnlab', 'altavista', 'anti-virus', 'antivirus', 'antiy', 'apexone',
'appengine-google', 'arcabit', 'avast', 'avg', 'avira', 'baidu', 'baiduspider',
'barracuda', 'bingbot', 'bitdefender', 'bitdefender', 'bluvector', 'carbon',
'carbonblack', 'check point', 'checkpoint', 'clamav', 'code42', 'comodo', 'countercept',
'countertack', 'crowdstrike', 'crowdstrike', 'curl', 'cybereason', 'cybereason',
'cylance', 'cylance', 'cynet360', 'cyren', 'defender', 'druva', 'drweb', 'duckduckbot',
'egambit', 'emsisoft', 'emsisoft', 'encase', 'endgame', 'endgame', 'ensilo', 'escan',
'eset', 'exabot', 'f-secure', 'facebookexternalhit', 'falcon', 'fidelis', 'fireeye',
'forcepoint', 'fortigate', 'fortil', 'fortinet', 'gdata', 'gdata', 'googlebot',
'gravityzone', 'huntress', 'ia_archiver', 'ikarussecurity', 'ivanti', 'juniper',
'k7antivirus', 'k7computing', 'kaspersky', 'kingsoft', 'lightcyber', 'lynx',
'malwarebytes', 'mcafee', 'mj12bot', 'msnbot', 'nanoav', 'netwitness', 'paloalto',
'paloaltonetworks', 'panda', 'proofpoint', 'python-urllib', 'scanner', 'scanning',
'secureage', 'secureworks', 'security', 'sentinelone', 'sentinelone', 'simplepie',
'slackbot-linkexpanding', 'slurp', 'sogou', 'sonicwall', 'sophos', 'superantispyware',
'symantec', 'tachyon', 'tencent', 'totaldefense', 'trapmine', 'trend micro', 'trendmicro',
'trusteer', 'trustlook', 'virusblokada', 'virustotal', 'virustotalcloud', 'webroot',
'wget', 'yandex', 'yandexbot', 'zillya', 'zonealarm', 'zscaler',
)
Interesting_Headers = (
@ -258,6 +272,19 @@ class SMTPHeadersAnalysis:
'sendgrid',
'mailchimp',
'x-ses',
'x-avas',
'X-Gmail-Labels',
'X-Originating-IP',
'X-vrfbldomain',
'mandrill',
'bulk',
'sendinblue',
'amazonses',
'mailjet',
'postmark',
'postfix',
'dovecot',
'roundcube',
)
Headers_Known_For_Breaking_Line = (
@ -297,6 +324,9 @@ class SMTPHeadersAnalysis:
'X-VR-SPAMSCORE',
'X-VR-SPAMCAUSE',
'X-Virus-Scanned',
'X-Spam-Checker-Version',
'X-IronPort-AV',
'X-Mimecast-Spam-Score',
)
auth_result = {
@ -309,6 +339,86 @@ class SMTPHeadersAnalysis:
'permerror': logger.colored('The message could not be verified due to some error that is unrecoverable, such as a required header field being absent.', 'red'),
}
IronPort_AV = {
'i' : (
'Version Information',
(
'Product Version',
'Number of IDEs',
'IDE Serial '
)
),
'E' : (
'AV scanning engine',
''
),
'e' : (
'Errors',
{
"i" : 'ignored',
"u" : logger.colored('unscannable', 'red'),
"e" : 'encrypted',
"t" : 'timeout',
"f" : 'fatal',
"j" : 'savi-bug (ignored)',
"s" : 'savi-bug (unscannable)',
"z" : 'unknown',
}
),
'v' : (
'Virus List',
(
'extension',
'type code list'
)
),
'd' : (
'File details',
(
'extension',
'type code list'
)
),
'a' : (
'Message actions',
{
'_map' : {
'N' : 'notification',
'H' : 'headers',
'T' : 'time',
':' : 'action'
},
'action' : {
"a" : 'archived ?',
"s" : logger.colored('sent', 'green'),
"d" : logger.colored('dropped', 'red'),
"f" : 'forwarded',
"x" : 'certain errors (timed-out, rpc conn fails, etc)',
},
'notification' : {
"s" : 'sender',
"r" : 'recipient',
"o" : 'other',
},
'headers' : {
"s" : 'subject modified',
"h" : 'custom header modified',
},
'time' : {
},
}
)
}
Forefront_Antispam_Report = {
'ARC' : (
'ARC Protocol',
@ -419,6 +529,11 @@ class SMTPHeadersAnalysis:
),
}
Spam_Diagnostics_Metadata = {
'NSPM' : logger.colored('Not Spam', 'green'),
'SPAM' : logger.colored('SPAM', 'red'),
}
Anti_Spam_Rules_ReverseEngineered = {
'35100500006' : logger.colored('(SPAM) Message contained embedded image. Score +4', 'red'),
}
@ -882,30 +997,35 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
self.results['ARC-Authentication-Results'] = self.testARCAuthenticationResults()
self.results['Received-SPF'] = self.testReceivedSPF()
self.results['Mail Client Version'] = self.testXMailer()
self.results['User-Agent Version'] = self.testUserAgent()
self.results['X-Forefront-Antispam-Report'] = self.testForefrontAntiSpamReport()
self.results['X-Microsoft-Antispam-Mailbox-Delivery'] = self.testAntispamMailboxDelivery()
self.results['X-Microsoft-Antispam Bulk Mail'] = self.testMicrosoftAntiSpam()
if self.decode_all:
self.results['X-Microsoft-Antispam-Message-Info'] = self.testMicrosoftAntiSpamMessageInfo()
self.results['Decoded Mail-encoded header values'] = self.testDecodeEncodedHeaders()
self.results['End-to-End Latency - Message Delivery Time'] = self.testTransportEndToEndLatency()
self.results['X-MS-Oob-TLC-OOBClassifiers'] = self.testTLCOObClasifiers()
self.results['MS Defender ATP Message Properties'] = self.testATPMessageProperties()
self.results['Domain Impersonation'] = self.testDomainImpersonation()
self.results['Other unrecognized Spam Related Headers'] = self.testSpamRelatedHeaders()
self.results['X-Exchange-Antispam-Report-CFA-Test'] = self.testAntispamReportCFA()
self.results['Spam Diagnostics Metadata'] = self.testSpamDiagnosticMetadata()
self.results['SpamAssassin Spam Status'] = self.testSpamAssassinSpamStatus()
self.results['SpamAssassin Spam Level'] = self.testSpamAssassinSpamLevel()
self.results['SpamAssassin Spam Flag'] = self.testSpamAssassinSpamFlag()
self.results['SpamAssassin Spam Report'] = self.testSpamAssassinSpamReport()
self.results['Message Feedback Loop'] = self.testMSFBL()
self.results['Other interesting headers'] = self.testInterestingHeaders()
self.results['OVH\'s X-VR-SPAMCAUSE'] = self.testSpamCause()
self.results['OVH\'s X-Ovh-Spam-Reason'] = self.testOvhSpamReason()
self.results['OVH\'s X-Ovh-Spam-Score'] = self.testOvhSpamScore()
self.results['X-Virus-Scan'] = self.testXVirusScan()
self.results['X-Spam-Checker-Version'] = self.testXSpamCheckerVersion()
self.results['X-IronPort-AV'] = self.testXIronPortAV()
self.results['X-Mimecast-Spam-Score'] = self.testXMimecastSpamScore()
if self.decode_all:
self.results['X-Microsoft-Antispam-Message-Info'] = self.testMicrosoftAntiSpamMessageInfo()
self.results['Decoded Mail-encoded header values'] = self.testDecodeEncodedHeaders()
self.results['Other unrecognized Spam Related Headers'] = self.testSpamRelatedHeaders()
self.results['Other interesting headers'] = self.testInterestingHeaders()
return {k: v for k, v in self.results.items() if v}
@ -986,6 +1106,142 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
'analysis' : result
}
def testSpamDiagnosticMetadata(self):
(num, header, value) = self.getHeader('SpamDiagnosticMetadata')
if num == -1: return []
result = f'- SpamDiagnosticMetadata: Antispam stamps in Exchange Server 2016.\n'
if value.strip() in SMTPHeadersAnalysis.Spam_Diagnostics_Metadata.keys():
result += f' {value}: ' + SMTPHeadersAnalysis.Spam_Diagnostics_Metadata[value.strip()] + '\n'
else:
result += f' {value}\n'
if len(result) == 0:
return []
return {
'header' : header,
'value': value,
'analysis' : result
}
def testXIronPortAV(self):
(num, header, value) = self.getHeader('X-IronPort-AV')
if num == -1: return []
result = f'- Cisco IronPort Anti-Virus interface.\n'
value = SMTPHeadersAnalysis.flattenLine(value)
parsed = {}
for a in value.split(';'):
k, v = a.split('=')
k = k.strip()
v = v.strip()
if v[0] == '"' and v[-1] == '"':
v = v[1:-1].replace(' ', '')
parsed[k] = v
for k, v in parsed.items():
result += f'\n\t- ' + SMTPHeadersAnalysis.IronPort_AV[k][0] + ':\n'
elem = SMTPHeadersAnalysis.IronPort_AV[k][1]
if k == 'i':
vs = v.split(',')
for i in range(len(elem)):
result += f'\t\t- {elem[i]}:\t{vs[i]}\n'
elif k == 'E':
v0 = self.logger.colored(v, 'red')
result += f'\t\t- {v0}\n'
elif k == 'e':
vs = v.split("'")
err = 'error'
if vs[1] in elem.keys():
err = elem[vs[1]]
result += f'\t\t- {err}: {vs[0]}\n'
elif k == 'v':
result += f'\t\t- {v}\n'
elif k == 'd':
result += f'\t\t- {v}\n'
elif k == 'a':
if ':' not in v:
result += f'\t\t- {v}\n'
continue
pos = 0
vs = v.split(':')
result += f'\t\t- {vs[0]}\n\n'
_map = SMTPHeadersAnalysis.IronPort_AV[k][1]['_map']
action = _map[':']
result += f'\t\t- {action} section:\n'
while pos < len(vs[1]):
c = vs[1][pos]
if c in _map.keys():
action = _map[c]
result += f'\n\t\t- {action} section:\n'
pos += 1
if action == 'time':
ts = vs[1][pos:]
ts2 = ''
try:
ts2 = datetime.utcfromtimestamp(int(ts)).strftime('%Y-%m-%d %H:%M:%S')
except:
pass
result += f'\t\t\t\t{ts}, {ts2}\n'
break
continue
if c in SMTPHeadersAnalysis.IronPort_AV[k][1][action].keys():
h = SMTPHeadersAnalysis.IronPort_AV[k][1][action][c]
result += f'\t\t\t- {c}: {h}\n'
else:
result += f'\t\t\t- {c}\n'
pos += 1
if len(result) == 0:
return []
return {
'header' : header,
'value': value,
'analysis' : result
}
def testXSpamCheckerVersion(self):
(num, header, value) = self.getHeader('X-Spam-Checker-Version')
if num == -1: return []
result = f'- SpamAssassin version.'
if len(result) == 0:
return []
return {
'header' : header,
'value': value,
'analysis' : result
}
def testOvhSpamScore(self):
(num, header, value) = self.getHeader('X-VR-SPAMSCORE')
if num == -1: return []
@ -1095,6 +1351,8 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
num0 = 0
shown = set()
handled = [x.lower() for x in SMTPHeadersAnalysis.Handled_Spam_Headers]
for num, header, value in self.headers:
value = SMTPHeadersAnalysis.flattenLine(value)
@ -1105,7 +1363,7 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
if header in shown:
break
if dodgy in header.lower() and header not in SMTPHeadersAnalysis.Handled_Spam_Headers:
if dodgy in header.lower() and header.lower() not in handled:
num0 += 1
hhh = re.sub(r'(' + re.escape(dodgy) + r')', self.logger.colored(r'\1', 'red'), header, flags=re.I)
@ -1115,7 +1373,7 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
shown.add(header)
break
elif dodgy in value.lower() and header not in SMTPHeadersAnalysis.Handled_Spam_Headers:
elif dodgy in value.lower() and header.lower() not in handled:
num0 += 1
hhh = header
tmp += f'\t({num0:02}) Header: {hhh}\n'
@ -1166,6 +1424,7 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
parsed['_result'] = self.logger.colored(value.strip().split(',')[0], col)
pos = len(parsed['_result'])+2
stop = False
while pos < len(value):
pose = value.find('=', pos)
@ -1179,7 +1438,16 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
pos += l
if k == 'tests':
v = value[pose+1:].replace(' ', '').replace('\n', '').split(',')
v0 = value[pose+1:].replace('\t', ' ').replace('\n', ' ')
m = re.search(r'\s+([a-z_]+\=)', v0)
if m:
pos0 = value.find(m.group(1), pose+1)
v = value[pose+1:pos0].replace(' ', '').replace('\n', '').split(',')
pos = pos0
else:
v = v0.replace(' ', '').replace('\n', '').split(',')
stop = True
else:
sp = value.find(' ', pose)
if sp == -1: break
@ -1188,7 +1456,7 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
pos = sp + 1
parsed[k] = v
if k == 'tests':
if stop:
break
for k, v in parsed.items():
@ -1929,6 +2197,33 @@ More information:
'analysis' : result
}
def testUserAgent(self):
(num, header, value) = self.getHeader('User-Agent')
if num == -1: return []
vvv = self.logger.colored(value, 'magenta')
result = f'- User-Agent header was present and contained value: {vvv}\n'
result + ' This header typically indicates sending client\'s name (similar to X-Mailer).'
return {
'header' : header,
'value': value,
'analysis' : result
}
def testXMimecastSpamScore(self):
(num, header, value) = self.getHeader('X-Mimecast-Spam-Score')
if num == -1: return []
vvv = self.logger.colored(value, 'magenta')
result = f'- Mimecast attached following Spam score: {vvv}\n'
return {
'header' : header,
'value': value,
'analysis' : result
}
def testTLCOObClasifiers(self):
(num, header, value) = self.getHeader('X-MS-Oob-TLC-OOBClassifiers')
if num == -1: return []