APT User Agent

 Original Source: [Sigma source]
Title: APT User Agent
Status: test
Description:Detects suspicious user agent strings used in APT malware in proxy logs
References:
  -Internal Research
Author: Florian Roth (Nextron Systems), Markus Neis
Date: 2019-11-12
modified:2024-02-15
Tags:
  • -'attack.command-and-control'
  • -'attack.t1071.001'
Logsource:
  • category: proxy
Detection:
  selection:
    c-useragent:
      -'SJZJ (compatible; MSIE 6.0; Win32)'
      -'Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0'
      -'User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC'
      -'Mozilla/4.0 (compatible; MSIE 7.4; Win32;32-bit)'
      -'webclient'
      -'Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/200'
      -'Mozilla/4.0 (compatible; MSI 6.0;'
      -'Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0'
      -'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:20.0) Gecko/20100101 Firefox/'
      -'Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/2'
      -'Mozilla/4.0'
      -'Netscape'
      -'Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/20100719 Firefox/1.0.7'
      -'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Firefox/3.6.13 GTB7.1'
      -'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)'
      -'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NETCLR 2.0.50727)'
      -'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; SV1)'
      -'Mozilla/4.0 (compatible; MSIE 11.0; Windows NT 6.1; SV1)'
      -'Mozilla/4.0 (compatible; MSIE 8.0; Win32)'
      -'Mozilla v5.1 (Windows NT 6.1; rv:6.0.1) Gecko/20100101 Firefox/6.0.1'
      -'Mozilla/6.1 (compatible; MSIE 9.0; Windows NT 5.3; Trident/5.0)'
      -'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)'
      -'Mozilla/5.0 (Windows NT 6.1; WOW64) WinHttp/1.6.3.8 (WinHTTP/5.1) like Gecko'
      -'Mozilla v5.1 *'
      -'MSIE 8.0'
      -'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)'
      -'Mozilla/4.0 (compatible; RMS)'
      -'Mozilla/4.0 (compatible; MSIE 6.0; DynGate)'
      -'O/9.27 (W; U; Z)'
      -'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.0; Trident/5.0; Trident/5.0*'
      -'Mozilla/5.0 (Windows NT 9; *'
      -'hots scot'
      -'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT)'
      -'Mozilla/5.0 (Windows NT 6.1; WOW64) Chrome/28.0.1500.95 Safari/537.36'
      -'Mozilla/5.0 (Windows NT 6.2; Win32; rv:47.0)'
      -'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1;'
      -'Mozilla/5.0 (X11; Linux i686; rv:22.0) Firefox/22.0'
      -'Mozilla/5.0 Chrome/72.0.3626.109 Safari/537.36'
      -'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:FTS_06) Gecko/22.36.35.06 Firefox/2.0'
      -'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'
      -'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)'
      -'Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 10.0; .NET4.0C; .NET4.0E; Tablet PC 2.0)'
      -'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'

  condition:selection
Falsepositives:
  -Old browsers
Level: high