APT_UA_Hermetic_Wiper_Artefacts_Feb22_1

rule APT_UA_Hermetic_Wiper_Artefacts_Feb22_1 {
   meta:
      description = "Detects artefacts found in Hermetic Wiper malware related intrusions"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/ukraine-wiper-malware-russia"
      date = "2022-02-25"
      score = 75
      id = "77f793c1-b02c-59c3-b3e4-75758f5b3b8d"
   strings:
      $sx1 = "/c powershell -c \"rundll32 C:\\windows\\system32\\comsvcs.dll MiniDump" ascii wide
      $sx2 = "appdata\\local\\microsoft\\windows\\winupd.log" ascii wide
      $sx3 = "AppData\\Local\\Microsoft\\Windows\\Winupd.log" ascii wide
      $sx4 = "CSIDL_SYSTEM_DRIVE\\temp\\sys.tmp1" ascii wide
      $sx5 = "\\policydefinitions\\postgresql.exe" ascii wide

      $sx6 = "powershell -v 2 -exec bypass -File text.ps1" ascii wide
      $sx7 = "powershell -exec bypass gp.ps1" ascii wide
      $sx8 = "powershell -exec bypass -File link.ps1" ascii wide

      /* 16 is the prefix of an epoch timestamp that shouldn't change until the 14th of November 2023 */
      $sx9 = " 1> \\\\127.0.0.1\\ADMIN$\\__16" ascii wide
      
      $sa1 = "(New-Object System.Net.WebClient).DownloadFile(" ascii wide
      $sa2 = "CSIDL_SYSTEM_DRIVE\\temp\\" ascii wide
      $sa3 = "1> \\\\127.0.0.1\\ADMIN$" ascii wide

      $fp1 = "<html" ascii
   condition:
      1 of ($sx*) or all of ($sa*)
      and not 1 of ($fp*)
}