APT User Agent

 1title: APT User Agent
 2id: 6ec820f2-e963-4801-9127-d8b2dce4d31b
 3status: test
 4description: Detects suspicious user agent strings used in APT malware in proxy logs
 5references:
 6    - Internal Research
 7author: Florian Roth (Nextron Systems), Markus Neis
 8date: 2019-11-12
 9modified: 2024-02-15
10tags:
11    - attack.command-and-control
12    - attack.t1071.001
13logsource:
14    category: proxy
15detection:
16    selection:
17        c-useragent:
18         # APT Related
19            - 'SJZJ (compatible; MSIE 6.0; Win32)' # APT Backspace
20            - 'Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0' # APT GrizzlySteppe - ChopStick - US CERT https://www.cisa.gov/news-events/alerts/2017/02/10/enhanced-analysis-grizzly-steppe
21            - 'User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC' # Comment Crew Miniasp
22            - 'Mozilla/4.0 (compatible; MSIE 7.4; Win32;32-bit)' # Comment Crew Miniasp
23            - 'webclient' # Naikon APT
24            - 'Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/200' # Naikon APT
25            - 'Mozilla/4.0 (compatible; MSI 6.0;' # SnowGlobe Babar - yes, it is cut
26            - 'Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0' # Sofacy - Xtunnel
27            - 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:20.0) Gecko/20100101 Firefox/' # Sofacy - Xtunnel
28            - 'Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/2' # Sofacy - Xtunnel
29            - 'Mozilla/4.0' # Derusbi backdoor ELF https://github.com/fideliscyber/indicators/tree/master/FTA-1021
30            - 'Netscape' # Unit78020 Malware
31            - 'Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/20100719 Firefox/1.0.7' # Unit78020 Malware
32            - 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Firefox/3.6.13 GTB7.1' # Winnti related
33            - 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)' # Winnti related
34            - 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NETCLR 2.0.50727)' # APT17
35            - 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; SV1)' # Bronze Butler - Daserf
36            - 'Mozilla/4.0 (compatible; MSIE 11.0; Windows NT 6.1; SV1)' # Bronze Butler - Daserf
37            - 'Mozilla/4.0 (compatible; MSIE 8.0; Win32)' # TSCookie https://app.any.run/tasks/0996b314-5133-491b-8d23-d431ffdec597
38            - '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/
39            - 'Mozilla/6.1 (compatible; MSIE 9.0; Windows NT 5.3; Trident/5.0)' # VPNFilter https://blog.talosintelligence.com/2018/05/VPNFilter.html
40            - '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/
41            - '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/
42            - 'Mozilla v5.1 *' # Sofacy Zebrocy samples
43            - 'MSIE 8.0' # Sofacy Azzy Backdoor  from https://www.hybrid-analysis.com/sample/a80e29c0757bee05338fd5c22a542d852ad86c477068e3eb4aacc1c3e59e2eef?environmentId=100
44            - '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
45            - 'Mozilla/4.0 (compatible; RMS)' # Attacks on industrial enterprises using RMS and TeamViewer - https://securelist.com/attacks-on-industrial-enterprises-using-rms-and-teamviewer/87104/
46            - 'Mozilla/4.0 (compatible; MSIE 6.0; DynGate)' # Attacks on industrial enterprises using RMS and TeamViewer - https://securelist.com/attacks-on-industrial-enterprises-using-rms-and-teamviewer/87104/
47            - 'O/9.27 (W; U; Z)' # Cmstar https://www.virustotal.com/#/file/e4328011bb2b04abc856ccd04404c9f95d67167f6c291d343e8ffa8aa2aa2099/details
48            - 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0;  Trident/5.0*' # KerrDown UA
49            - 'Mozilla/5.0 (Windows NT 9; *' # Suspicious 'Windows NT 9' user agent - used by APT33 malware in 2018
50            - 'hots scot' # Unknown iOS zero-day implant https://twitter.com/craiu/status/1176437994288484352?s=20
51            - 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT)' # https://blog.telsy.com/meeting-powerband-the-apt33-net-powerton-variant/
52            - 'Mozilla/5.0 (Windows NT 6.1; WOW64) Chrome/28.0.1500.95 Safari/537.36' # Hidden Cobra malware
53            - 'Mozilla/5.0 (Windows NT 6.2; Win32; rv:47.0)' # Strong Pity loader https://twitter.com/VK_Intel/status/1264185981118406657
54            - 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1;' # Mustang Panda https://insights.oem.avira.com/new-wave-of-plugx-targets-hong-kong/
55            - 'Mozilla/5.0 (X11; Linux i686; rv:22.0) Firefox/22.0' # BackdoorDiplomacy https://www.welivesecurity.com/2021/06/10/backdoordiplomacy-upgrading-quarian-turian/
56            - 'Mozilla/5.0 Chrome/72.0.3626.109 Safari/537.36' # SideWalk malware used by Sparkling Goblin
57            - 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:FTS_06) Gecko/22.36.35.06 Firefox/2.0' # LitePower stager used by WRITE https://securelist.com/wirtes-campaign-in-the-middle-east-living-off-the-land-since-at-least-2019/105044/
58            - 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36 Edg/100.0.1185.39' # https://www.microsoft.com/security/blog/2022/09/29/zinc-weaponizing-open-source-software/
59            - 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3; .NET4.0C; .NET4.0E)' # https://www.microsoft.com/security/blog/2022/09/29/zinc-weaponizing-open-source-software/
60            - 'Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 10.0; .NET4.0C; .NET4.0E; Tablet PC 2.0)' # PlugX backdoor https://unit42.paloaltonetworks.com/thor-plugx-variant/
61            - 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246001'  # RedCurl Downloader APT https://www.facct.ru/blog/redcurl-2024
62    condition: selection
63fields:
64    - ClientIP
65    - c-uri
66    - c-useragent
67falsepositives:
68    - Old browsers
69level: high