WiltedTulip_Matryoshka_RAT

rule WiltedTulip_Matryoshka_RAT {
   meta:
      description = "Detects Matryoshka RAT used in Operation Wilted Tulip"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "http://www.clearskysec.com/tulip"
      date = "2017-07-23"
      hash1 = "6f208473df0d31987a4999eeea04d24b069fdb6a8245150aa91dfdc063cd64ab"
      hash2 = "6cc1f4ecd28b833c978c8e21a20a002459b4a6c21a4fbaad637111aa9d5b1a32"
      id = "e851e212-bb71-55c9-9bc1-0041bb04bef5"
   strings:
      $s1 = "%S:\\Users\\public" fullword wide
      $s2 = "ntuser.dat.swp" fullword wide
      $s3 = "Job Save / Load Config" fullword wide
      $s4 = ".?AVPSCL_CLASS_JOB_SAVE_CONFIG@@" fullword ascii
      $s5 = "winupdate64.com" fullword ascii
      $s6 = "Job Save KeyLogger" fullword wide
   condition:
      ( uint16(0) == 0x5a4d and filesize < 1000KB and 3 of them )
}