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https://github.com/mgeeky/decode-spam-headers.git
synced 2024-11-21 10:01:38 +01:00
Updates
This commit is contained in:
mgeeky
parent
9fa37bcfe5
commit
e895038e3b
@ -11,10 +11,14 @@ import glob
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import base64
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rules = {}
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files_and_their_rules = {}
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scanned = set()
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FILES_PREFIX='analysis-'
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def walk(path):
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global rules
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global files_and_their_rules
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global scanned
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print(f'Walking {path}...')
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@ -23,7 +27,14 @@ def walk(path):
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if not file.lower().endswith('.txt'):
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continue
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if file in scanned: continue
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if file in scanned:
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continue
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base = os.path.basename(file)
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if len(FILES_PREFIX) > 0:
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if not base.lower().startswith(FILES_PREFIX.lower()):
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continue
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scanned.add(file)
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data = ''
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@ -33,6 +44,11 @@ def walk(path):
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for m in re.finditer(r'(\(\d{4,}\))', data, re.I):
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rule = m.group(1)
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if file not in files_and_their_rules.keys():
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files_and_their_rules[file] = set()
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files_and_their_rules[file].add(rule)
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if rule in rules.keys():
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if file not in rules[rule]['files']:
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rules[rule]['count'] += 1
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@ -57,7 +73,6 @@ def main(argv):
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print(f'[.] Found {len(rules)} unique rules.:')
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candidates = []
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for k, v in rules.items():
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if v['count'] > 1:
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print(f'\n\t- {k: <15}: occurences: {v["count"]} - files: {len(v["files"])}')
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@ -66,5 +81,38 @@ def main(argv):
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for f in v['files']:
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print('\t\t- ' + str(f))
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output = ' # | file1 | file2 |\n'
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output+= '----+----------------------------------------------------+----------------------------------------------------+\n'
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checked = set()
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for k, v in files_and_their_rules.items():
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for k1, v1 in files_and_their_rules.items():
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if k == k1:
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continue
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n = max(len(v.difference(v1)), len(v1.difference(v)))
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if n <= 3 and n > 0:
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if k not in checked and k1 not in checked:
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output += f' {n: <2} | {k[-50:]: <50} | {k1[-50:]: <50} |\n'
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checked.add(k)
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checked.add(k1)
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output+= '----+----------------------------------------------------+----------------------------------------------------+\n'
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print('\nCross-File rules differences:\n')
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print(output)
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print('\n\nFiles and rules matched:\n')
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num = 0
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s = {k: v for k, v in sorted(files_and_their_rules.items(), key=lambda item: len(item[1]))}
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for k, v in s.items():
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num += 1
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print(f'{num: <3}. Rules: {len(v): <2}, File: {k}')
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print()
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if __name__ == '__main__':
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main(sys.argv)
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@ -77,6 +77,8 @@
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# - X-microsoft-antispam-untrusted
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# - X-sophos-senderhistory
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# - X-sophos-rescan
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# - X-MS-Exchange-CrossTenant-Id
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# - X-OriginatorOrg
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#
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# Usage:
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# ./decode-spam-headers [options] <smtp-headers.txt>
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@ -91,6 +93,7 @@
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# Requirements:
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# - packaging
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# - dnspython
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# - requests
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#
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# Mariusz Banach / mgeeky, '21
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# <mb [at] binary-offensive.com>
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@ -121,6 +124,16 @@ except ImportError:
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''')
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sys.exit(1)
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try:
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import requests
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except ImportError:
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print('''
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[!] You need to install requests:
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# pip3 install requests
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''')
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sys.exit(1)
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try:
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import dns.resolver
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@ -360,7 +373,7 @@ class SMTPHeadersAnalysis:
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'yandex', 'yandexbot', 'zillya', 'zonealarm', 'zscaler', '-sea-', 'perlmx', 'trustwave',
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'mailmarshal', 'tmase', 'startscan', 'fe-etp', 'jemd', 'suspicious', 'grey', 'infected', 'unscannable',
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'dlp-', 'sanitize', 'mailscan', 'barracuda', 'clearswift', 'messagelabs', 'msw-jemd', 'fe-etp', 'symc-ess',
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'starscan', 'mailcontrol',
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'starscan', 'mailcontrol'
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)
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Interesting_Headers = (
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@ -372,7 +385,35 @@ class SMTPHeadersAnalysis:
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'X-ICPINFO', 'x-locaweb-id', 'X-MC-User', 'mailersend', 'MailiGen', 'Mandrill', 'MarketoID', 'X-Messagebus-Info',
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'Mixmax', 'X-PM-Message-Id', 'postmark', 'X-rext', 'responsys', 'X-SFDC-User', 'salesforce', 'x-sg-', 'x-sendgrid-',
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'silverpop', '.mkt', 'X-SMTPCOM-Tracking-Number', 'X-vrfbldomain', 'verticalresponse',
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'yesmail',
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'yesmail', 'logon', 'safelink', 'safeattach',
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)
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Security_Appliances_And_Their_Headers = \
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(
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('Exchange Online Protection' , 'X-EOP'),
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('MS Defender For Office365' , '-Safelinks'),
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('Proofpoint Email Protection' , 'X-Proofpoint'),
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('Trend Micro Anti-Spam' , 'X-TMASE-'),
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('Trend Micro Anti-Spam' , 'X-TM-AS-'),
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('Trend Micro InterScan Messaging Security' , 'X-IMSS-'),
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('Barracuda Email Security' , 'X-Barracuda-'),
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('Mimecast' , 'X-Mimecast-'),
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('FireEye Email Security Solution' , 'X-FireEye'),
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('FireEye Email Security Solution' , 'X-FE-'),
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('Cisco IronPort' , 'X-IronPort-'),
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('Cisco IronPort / Email Security Appliance (ESA)' , 'X-Policy'),
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('Cisco IronPort / Email Security Appliance (ESA)' , 'X-SBRS'),
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('Sophos Email Appliance (PureMessage)' , 'X-SEA-'),
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('Exchange Server 2016 Anti-Spam' , 'SpamDiagnostic'),
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('SpamAssassin' , 'X-Spam-'),
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('SpamAssassin' , 'X-IP-Spam-'),
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('OVH Anti-Spam' , 'X-VR-'),
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('OVH Anti-Spam' , 'X-Ovh-'),
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('MS Defender Advanced Threat Protection' , 'X-MS.+-Atp'),
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('MS Defender Advanced Threat Protection - Safe Links' , '-ATPSafeLinks'),
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('Cisco Advanced Malware Protection (AMP)' , 'X-Amp-'),
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('MS ForeFront Anti-Spam' , 'X-Microsoft-Antispam'),
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('MS ForeFront Anti-Spam' , 'X-Forefront-Antispam'),
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)
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Headers_Known_For_Breaking_Line = (
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@ -694,7 +735,7 @@ class SMTPHeadersAnalysis:
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# Message contained <a href="https://something.com/file.html?parameter=https://another.com/website"
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# - GET parameter with value, being a URL to another website
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'45080400002' : 'Mail body contained <a> tag with URL containing GET parameter with value of another URL: ex. href="https://foo.bar/file?aaa=https://baz.xyz/"',
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'45080400002' : 'Something about <a> tag\'s URL. Possibly it contained GET parameter with value of another URL: ex. href="https://foo.bar/file?aaa=https://baz.xyz/"',
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# Message contained <a> with href pointing to a file with dangerous extension, such as file.exe
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'460985005' : 'Mail body contained HTML <a> tag with href URL pointing to a file with dangerous extension (such as .exe)',
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@ -709,6 +750,29 @@ class SMTPHeadersAnalysis:
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#
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'121216002' : 'First Hop MTA SMTP Server used as a SMTP Relay. It\'s known to originate e-mails, but here it acted as a Relay. Or maybe due to use of "with ESMTPSA" instead of ESMTPS?',
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# Triggered on message with <a> added to HTML: <a href="https://support.spotify.com/is-en/">https://www.reddit.com/</a>
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'966005' : 'Mail body contained link tag with potentially masqueraded URL: <a href="https://attacker.com">https://example.com</a>',
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#
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# Message1: GoPhish EC2 -> another EC2 with socat to smtp.gmail.com:587 (authenticated) -> Target
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# Message2: GoPhish EC2 -> Gsuite -> Target
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#
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# Subject, mail body were exactly the same.
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#
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# Below two rules were added to the second message. My understanding is that they're somehow referring
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# to the reputation of the first-hop server, maybe reverse-DNS resolution.
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#
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'5002400100002' : "(GUESSING) Somehow related to First Hop server reputation, it's reverse-PTR resolution or domain impersonation",
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'58800400005' : "(GUESSING) Somehow related to First Hop server reputation, it's reverse-PTR resolution or domain impersonation",
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'19625305002' : '(GUESSING) Something to do with the HTML code and used tags/structures',
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'43540500002' : '(GUESSING) Something to do with the HTML code and used tags/structures',
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'460985005' : '(GUESSING) Something to do with either more-complex HTML code or with the <a> tag and its URL.',
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# Triggered on an empty text message, subject "test" - that was marked with "Domain Impersonation", however
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# ForeFront Anti-Spam headers did not support that Domain Impersonation. Weird.
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'22186003' : '(GUESSING) Something to do with either Text message (non-HTML) or probable Domain Impersonation'
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}
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ForeFront_Spam_Confidence_Levels = {
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@ -733,9 +797,9 @@ class SMTPHeadersAnalysis:
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ForeFront_Bulk_Confidence_Levels = {
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0 : logger.colored('The message isn\'t from a bulk sender.', 'green'),
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1 : logger.colored('The message is from a bulk sender that generates few complaints.', 'magenta'),
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2 : logger.colored('The message is from a bulk sender that generates few complaints.', 'magenta'),
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3 : logger.colored('The message is from a bulk sender that generates few complaints.', 'magenta'),
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1 : logger.colored('The message is from a bulk sender that generates few complaints.', 'yellow'),
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2 : logger.colored('The message is from a bulk sender that generates few complaints.', 'yellow'),
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3 : logger.colored('The message is from a bulk sender that generates few complaints.', 'yellow'),
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4 : logger.colored('The message is from a bulk sender that generates a mixed number of complaints.', 'red'),
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5 : logger.colored('The message is from a bulk sender that generates a mixed number of complaints.', 'red'),
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6 : logger.colored('The message is from a bulk sender that generates a mixed number of complaints.', 'red'),
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@ -791,6 +855,7 @@ class SMTPHeadersAnalysis:
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{
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'I' : logger.colored('Inbox directory', 'green'),
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'J' : logger.colored('JUNK directory', 'red'),
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'C' : logger.colored('Custom directory', 'yellow'),
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}
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),
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@ -1128,13 +1193,16 @@ class SMTPHeadersAnalysis:
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('66', 'X-Proofpoint-Spam-Details', self.testXProofpointSpamDetails),
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('67', 'X-Proofpoint-Virus-Version', self.testXProofpointVirusVersion),
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('68', 'SPFCheck', self.testSPFCheck),
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('69', 'X-Barracuda-Spam-Score', self.testXBarracudaSpamScore),
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('70', 'X-Barracuda-Spam-Status', self.testXBarracudaSpamStatus),
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('71', 'X-Barracuda-Spam-Report', self.testXBarracudaSpamReport),
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('72', 'X-Barracuda-Bayes', self.testXBarracudaBayes),
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('73', 'X-Barracuda-Start-Time', self.testXBarracudaStartTime),
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('83', 'Office365 Tenant ID', self.testO365TenantID),
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('84', 'Organization Name', self.testOrganizationIsO365Tenant),
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('85', 'MS Defender For Office365 Safe Links Version',self.testSafeLinksKeyVer),
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#
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# These tests shall be the last ones.
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#
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@ -1155,6 +1223,12 @@ class SMTPHeadersAnalysis:
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('82', 'Header Containing Client IP', self.testAnyOtherIP),
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)
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ids = set()
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for test in (tests + testsDecodeAll + testsReturningArray):
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assert test[0] not in ids, f"Test ID already taken: ({test[0]} - '{test[1]}')! IDs must be unique!"
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ids.add(test[0])
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return (tests, testsDecodeAll, testsReturningArray)
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@staticmethod
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@ -1372,10 +1446,10 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
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idsOfDecodeAll = [int(x[0]) for x in testsDecodeAll]
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for a in self.testsToRun:
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if a in idsOfDecodeAll:
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self.decode_all = True
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break
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#for a in self.testsToRun:
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# if a in idsOfDecodeAll:
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# self.decode_all = True
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# break
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if self.decode_all:
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for testId, testName, testFunc in testsDecodeAll:
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@ -1672,6 +1746,21 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
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'description' : '',
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}
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def testSafeLinksKeyVer(self):
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(num, header, value) = self.getHeader('X-MS-Exchange-Safelinks-Url-KeyVer')
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if num == -1: return []
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value = value.strip()
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self.securityAppliances.add('MS Defender For Office365 - Safe Links')
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result = f'- Microsoft Defender For Office365 (MDO) Safe Links was used in key version: {self.logger.colored(value, "green")}\n'
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return {
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'header': header,
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'value' : value,
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'analysis' : result,
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'description' : '',
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}
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def testSecurityAppliances(self):
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result = ''
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@ -1679,6 +1768,11 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
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self.logger.dbg('Spotted clues about security appliances:')
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for (num, header, value) in self.headers:
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for product, hdr in SMTPHeadersAnalysis.Security_Appliances_And_Their_Headers:
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if re.search(re.escape(hdr), header, re.I):
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self.securityAppliances.add(product)
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for a in self.securityAppliances:
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parts = a.split(' ')
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skip = True
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@ -1703,6 +1797,174 @@ Results will be unsound. Make sure you have pasted your headers with correct spa
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'description' : '',
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}
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def testO365TenantID(self):
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(num, header, value) = self.getHeader('X-MS-Exchange-CrossTenant-Id')
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if num == -1: return []
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value = SMTPHeadersAnalysis.flattenLine(value).strip().replace(' ', '')
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result = f'- Office365 Tenant ID: {self.logger.colored(value, "green")}\n'
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try:
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r = requests.get(f'https://login.microsoftonline.com/{value}/.well-known/openid-configuration')
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out = r.json()
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#
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# Sample response for "microsoft.com":
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# https://login.microsoftonline.com/microsoft.com/.well-known/openid-configuration
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#
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# RESPONSE:
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# {
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# "token_endpoint": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/oauth2/token",
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# "token_endpoint_auth_methods_supported": [
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# "client_secret_post",
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# "private_key_jwt",
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# "client_secret_basic"
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# ],
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# "jwks_uri": "https://login.microsoftonline.com/common/discovery/keys",
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# "response_modes_supported": [
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# "query",
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# "fragment",
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# "form_post"
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# ],
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# "subject_types_supported": [
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# "pairwise"
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# ],
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# "id_token_signing_alg_values_supported": [
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# "RS256"
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# ],
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# "response_types_supported": [
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# "code",
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# "id_token",
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# "code id_token",
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# "token id_token",
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# "token"
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# ],
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# "scopes_supported": [
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# "openid"
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# ],
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# "issuer": "https://sts.windows.net/72f988bf-86f1-41af-91ab-2d7cd011db47/",
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# "microsoft_multi_refresh_token": true,
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# "authorization_endpoint": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/oauth2/authorize",
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# "device_authorization_endpoint": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/oauth2/devicecode",
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# "http_logout_supported": true,
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# "frontchannel_logout_supported": true,
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# "end_session_endpoint": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/oauth2/logout",
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# "claims_supported": [
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# "sub",
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# "iss",
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# "cloud_instance_name",
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# "cloud_instance_host_name",
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# "cloud_graph_host_name",
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# "msgraph_host",
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# "aud",
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# "exp",
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# "iat",
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# "auth_time",
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# "acr",
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# "amr",
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# "nonce",
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# "email",
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# "given_name",
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# "family_name",
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# "nickname"
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# ],
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# "check_session_iframe": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/oauth2/checksession",
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# "userinfo_endpoint": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/openid/userinfo",
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# "kerberos_endpoint": "https://login.microsoftonline.com/72f988bf-86f1-41af-91ab-2d7cd011db47/kerberos",
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# "tenant_region_scope": "WW",
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# "cloud_instance_name": "microsoftonline.com",
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# "cloud_graph_host_name": "graph.windows.net",
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# "msgraph_host": "graph.microsoft.com",
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# "rbac_url": "https://pas.windows.net"
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# }
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if 'error' in out.keys() and out['error'] != '':
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m = out['error']
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result += '\t- Office365 Tenant ' + self.logger.colored(f'does not exist: {m}\n', 'red')
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else:
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result += '\t- Office365 Tenant ' + self.logger.colored(f'exists.\n', 'green')
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tmp = ''
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num0 = 0
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for (num1, header1, value1) in self.headers:
|
||||
value1 = SMTPHeadersAnalysis.flattenLine(value1).strip()
|
||||
if value.lower() in value1.lower() and header1.lower() != header.lower():
|
||||
num0 += 1
|
||||
pos = value1.lower().find(value.lower())
|
||||
val = value1
|
||||
if pos != -1:
|
||||
val = value1[:pos] + self.logger.colored(value1[pos:pos+len(value)], 'yellow') + value1[pos+len(value):]
|
||||
|
||||
tmp += f'\t- ({num0:02}) Header: {header1}\n'
|
||||
tmp += f'\t Value: {val}\n\n'
|
||||
|
||||
if len(tmp) > 0:
|
||||
result += '\n - Tenant ID found in following headers:\n'
|
||||
result += '\n' + tmp + '\n'
|
||||
|
||||
except:
|
||||
self.logger.err(f'Could not fetch Office365 tenant OpenID configuration.')
|
||||
result += self.logger.colored('\t- Error: Could not fetch information about Office365 Tenant.\n', 'red')
|
||||
|
||||
return {
|
||||
'header': header,
|
||||
'value' : value,
|
||||
'analysis' : result,
|
||||
'description' : '',
|
||||
}
|
||||
|
||||
|
||||
def testOrganizationIsO365Tenant(self):
|
||||
(num, header, value) = self.getHeader('X-OriginatorOrg')
|
||||
if num == -1: return []
|
||||
|
||||
value = SMTPHeadersAnalysis.flattenLine(value).strip()
|
||||
|
||||
result = f'- Organization name disclosed: {self.logger.colored(value, "green")}\n'
|
||||
|
||||
try:
|
||||
r = requests.get(f'https://login.microsoftonline.com/{value}/.well-known/openid-configuration')
|
||||
out = r.json()
|
||||
|
||||
if 'error' in out.keys() and out['error'] != '':
|
||||
m = out['error']
|
||||
return []
|
||||
|
||||
result += '\n - Organization disclosed in "X-OriginatorOrg" is a valid Office 365 Tenant:\n'
|
||||
tid = out['token_endpoint'].replace('https://login.microsoftonline.com/', '')
|
||||
tid = tid.replace('/oauth2/token', '')
|
||||
|
||||
result += '\t- Office365 Tenant ID: ' + self.logger.colored(tid, 'green') + '\n'
|
||||
tmp = ''
|
||||
|
||||
num0 = 0
|
||||
for (num1, header1, value1) in self.headers:
|
||||
value1 = SMTPHeadersAnalysis.flattenLine(value1).strip()
|
||||
if value.lower() in value1.lower() and header1.lower() != header.lower():
|
||||
num0 += 1
|
||||
pos = value1.lower().find(value.lower())
|
||||
val = value1
|
||||
if pos != -1:
|
||||
val = value1[:pos] + self.logger.colored(value1[pos:pos+len(value)], 'yellow') + value1[pos+len(value):]
|
||||
|
||||
tmp += f'\t- ({num0:02}) Header: {header1}\n'
|
||||
tmp += f'\t Value: {val}\n\n'
|
||||
|
||||
if len(tmp) > 0:
|
||||
result += '\n - Organization name was also found in following headers:\n'
|
||||
result += '\n' + tmp + '\n'
|
||||
|
||||
except:
|
||||
self.logger.err(f'Could not fetch Office365 tenant OpenID configuration.')
|
||||
|
||||
return {
|
||||
'header': header,
|
||||
'value' : value,
|
||||
'analysis' : result,
|
||||
'description' : '',
|
||||
}
|
||||
|
||||
def testXProofpointSpamDetails(self):
|
||||
(num, header, value) = self.getHeader('X-Proofpoint-Spam-Details')
|
||||
if num == -1: return []
|
||||
@ -3314,6 +3576,7 @@ Src: https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA
|
||||
for prop in props:
|
||||
if prop in SMTPHeadersAnalysis.ATP_Message_Properties.keys():
|
||||
result += f'\t- ' + self.logger.colored(SMTPHeadersAnalysis.ATP_Message_Properties[prop], 'magenta') + '\n'
|
||||
self.securityAppliances.add('MS Defender For Office365 - ' + SMTPHeadersAnalysis.ATP_Message_Properties[prop])
|
||||
|
||||
return {
|
||||
'header' : header,
|
||||
@ -3721,12 +3984,12 @@ Src: https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA
|
||||
|
||||
result = ''
|
||||
|
||||
obj1 = self._parseBulk(num, header, value)
|
||||
result += obj1['analysis']
|
||||
|
||||
obj2 = self._parseAntiSpamReport(num, header, value)
|
||||
result += obj2['analysis']
|
||||
|
||||
obj1 = self._parseBulk(num, header, value)
|
||||
result += '\n' + obj1['analysis']
|
||||
|
||||
self.securityAppliances.add('MS ForeFront Anti-Spam')
|
||||
|
||||
obj['analysis'] = result
|
||||
@ -4113,14 +4376,17 @@ Src: https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA
|
||||
if num == -1: return []
|
||||
|
||||
parsed = {}
|
||||
self.securityAppliances.add('MS ForeFront Anti-Spam')
|
||||
result = '- This header denotes what to do with received message, where to put it.\n\n'
|
||||
self.securityAppliances.add('MS ForeFront Anti-Spam')
|
||||
result = '- This header denotes where to move received message. Informs about applied Mail Rules, target directory in user\'s Inbox.\n\n'
|
||||
|
||||
for entry in value.split(';'):
|
||||
if len(entry.strip()) == 0: continue
|
||||
k, v = entry.split(':')
|
||||
if k not in parsed.keys():
|
||||
parsed[k] = v
|
||||
parsed[k.lower()] = v
|
||||
|
||||
if 'ucf' in parsed.keys() and 'dest' in parsed.keys() and parsed['ucf'] == '1' and parsed['dest'] == 'J':
|
||||
result += self.logger.colored(f'- WARNING: User created a custom mail rule that moved this message to JUNK folder!\n', "red")
|
||||
|
||||
for k, v in parsed.items():
|
||||
elem = None
|
||||
@ -4155,9 +4421,9 @@ Src: https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA
|
||||
result += tmp + '\n'
|
||||
|
||||
for k in ['SFS', 'RULEID', 'ENG']:
|
||||
if k in parsed.keys():
|
||||
if k.lower() in parsed.keys():
|
||||
res = ''
|
||||
rules = [x.replace('(', '') for x in parsed[k].split(')')]
|
||||
rules = [x.replace('(', '') for x in parsed[k.lower()].split(')')]
|
||||
|
||||
if len(rules) == 1 and len(rules[0].strip()) == 0:
|
||||
rules = []
|
||||
@ -4590,6 +4856,7 @@ def printOutput(out):
|
||||
value = v['value']
|
||||
|
||||
analysis = analysis.strip()
|
||||
if analysis.startswith('\n'): analysis[1:]
|
||||
|
||||
value = str(textwrap.fill(
|
||||
v['value'],
|
||||
@ -4628,7 +4895,8 @@ def printOutput(out):
|
||||
{value}
|
||||
|
||||
{logger.colored("ANALYSIS", "yellow")}:
|
||||
{analysis}
|
||||
|
||||
{analysis}
|
||||
'''
|
||||
else:
|
||||
output += f'''
|
||||
@ -4636,7 +4904,8 @@ def printOutput(out):
|
||||
({num}) Test: {logger.colored(k, "cyan")}
|
||||
|
||||
{logger.colored("ANALYSIS", "yellow")}:
|
||||
{analysis}
|
||||
|
||||
{analysis}
|
||||
'''
|
||||
|
||||
if options['format'] == 'html':
|
||||
|
||||
Loading…
Reference in New Issue
Block a user