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53 lines
4.2 KiB
YAML
53 lines
4.2 KiB
YAML
title: APT User Agent
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status: experimental
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description: Detects suspicious user agent strings used in APT malware in proxy logs
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references:
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- Internal Research
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author: Florian Roth, Markus Neis
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logsource:
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category: proxy
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detection:
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selection:
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UserAgent:
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# APT Related
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- 'SJZJ (compatible; MSIE 6.0; Win32)' # APT Backspace
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- 'Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0' # APT GrizzlySteppe - ChopStick - US CERT https://goo.gl/1DTHwi
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- 'User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC' # Comment Crew Miniasp
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- 'Mozilla/4.0 (compatible; MSIE 7.4; Win32;32-bit)' # Comment Crew Miniasp
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- 'webclient' # Naikon APT
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- 'Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/200' # Naikon APT
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- 'Mozilla/4.0 (compatible; MSI 6.0;' # SnowGlobe Babar - yes, it is cut
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- 'Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0' # Sofacy - Xtunnel
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- 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:20.0) Gecko/20100101 Firefox/' # Sofacy - Xtunnel
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- 'Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/2' # Sofacy - Xtunnel
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- 'Mozilla/4.0' # Derusbi backdoor ELF https://github.com/fideliscyber/indicators/tree/master/FTA-1021
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- 'Netscape' # Unit78020 Malware
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- 'Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/20100719 Firefox/1.0.7' # Unit78020 Malware
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- 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Firefox/3.6.13 GTB7.1' # Winnti related
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- 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)' # Winnti related
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- 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NETCLR 2.0.50727)' # APT17
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- 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; SV1)' # Bronze Butler - Daserf
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- 'Mozilla/4.0 (compatible; MSIE 11.0; Windows NT 6.1; SV1)' # Bronze Butler - Daserf
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- 'Mozilla/4.0 (compatible; MSIE 8.0; Win32)' # TSCookie https://app.any.run/tasks/0996b314-5133-491b-8d23-d431ffdec597
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- 'Mozilla v5.1 (Windows NT 6.1; rv:6.0.1) Gecko/20100101 Firefox/6.0.1' # Delphi downloader https://www.welivesecurity.com/2018/04/24/sednit-update-analysis-zebrocy/
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- 'Mozilla/6.1 (compatible; MSIE 9.0; Windows NT 5.3; Trident/5.0)' # VPNFilter https://blog.talosintelligence.com/2018/05/VPNFilter.html
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- 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; InfoPath.1)' # Sofacy User-Agent https://researchcenter.paloaltonetworks.com/2018/06/unit42-sofacy-groups-parallel-attacks/
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- 'Mozilla/5.0 (Windows NT 6.1; WOW64) WinHttp/1.6.3.8 (WinHTTP/5.1) like Gecko' # Sofacy User-Agent https://researchcenter.paloaltonetworks.com/2018/06/unit42-sofacy-groups-parallel-attacks/
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- 'Mozilla v5.1 *' # Sofacy Zebrocy samples
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- 'MSIE 8.0' # Sofacy Azzy Backdoor from https://www.hybrid-analysis.com/sample/a80e29c0757bee05338fd5c22a542d852ad86c477068e3eb4aacc1c3e59e2eef?environmentId=100
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- 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.2)' # https://www.fireeye.com/blog/threat-research/2018/07/microsoft-office-vulnerabilities-used-to-distribute-felixroot-backdoor.html
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- 'Mozilla/4.0 (compatible; RMS)' # Attacks on industrial enterprises using RMS and TeamViewer https://goo.gl/GthvTw
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- 'Mozilla/4.0 (compatible; MSIE 6.0; DynGate)' # Attacks on industrial enterprises using RMS and TeamViewer https://goo.gl/GthvTw
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- 'O/9.27 (W; U; Z)' # Cmstar https://www.virustotal.com/#/file/e4328011bb2b04abc856ccd04404c9f95d67167f6c291d343e8ffa8aa2aa2099/details
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- 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0; Trident/5.0*' # KerrDown UA https://goo.gl/s2WU6o
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- 'Mozilla/5.0 (Windows NT 9; *' # Suspicious 'Windows NT 9' user agent - used by APT33 malware in 2018
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condition: selection
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fields:
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- ClientIP
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- URL
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- UserAgent
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falsepositives:
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- Old browsers
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level: high
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