APT_UNC2447_BAT_Runner_May21_1

rule APT_UNC2447_BAT_Runner_May21_1 {
   meta:
      description = "Detects Batch script runners from UNC2447 campaign"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://www.fireeye.com/blog/threat-research/2021/04/unc2447-sombrat-and-fivehands-ransomware-sophisticated-financial-threat.html"
      date = "2021-05-01"
      modified = "2023-01-07"
      hash1 = "ccacf4658ae778d02e4e55cd161b5a0772eb8b8eee62fed34e2d8f11db2cc4bc"
      id = "0bacd4f7-421a-570f-9f74-5a19ab806dd0"
   strings:
      $x1 = "powershell.exe -c \"[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String([IO.File]::" ascii
      $x2 = "wwansvc.txt')))\" | powershell.exe -" ascii
   condition:
      filesize < 5000KB and 1 of them
}