/*
   Yara Rule Set
   Author: Florian Roth
   Date: 2018-03-06
   Identifier: CrimsonRAT
   Reference: Internal Research
*/

/* Rule Set ----------------------------------------------------------------- */

rule CrimsonRAT_Mar18_1 {
   meta:
      description = "Detects CrimsonRAT malware"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "Internal Research"
      date = "2018-03-06"
      hash1 = "acf2e8013b6fafcf436d5a05049896504ffa2e982bca05155d19981d1931c611"
      hash2 = "7ca6e5ef1d346ec35993c910128a3526b098a07445131784a9358bf5679e3975"
      hash3 = "be4264973de9886caedae1cb707586588d0da85ac7a2ad277db4258033ea12a8"
      hash4 = "acf2e8013b6fafcf436d5a05049896504ffa2e982bca05155d19981d1931c611"
      hash5 = "ff52b4a64ed7caeab00350e493968dbdb159aeb545fcba67d83ab9b158464de4"
      id = "af21876c-f99d-5307-abba-02c57ee93df0"
   strings:
      $x1 = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run|" wide
      $x2 = "\\Release\\RTLBot.pdb" ascii
      $x3 = "cmd.exe/c systeminfo >> 1.txt" fullword wide
      $x4 = "/online >> Get online target with important info" fullword wide
      $x5 = "/screen >> ScreenShot from target PC" fullword wide
      $x6 = "/restart >> Restart Target PC" fullword wide
      $x7 = "/log_key >> Get log key file" fullword wide

      $a1 = "get_ShiftKey" fullword ascii
      $a2 = "get_ControlKey" fullword ascii
      $a3 = "get_AltKey" fullword ascii
      $a4 = "get_MineInterval" fullword ascii

      $fp1 = "Copyright Software Secure" wide
   condition:
      uint16(0) == 0x5a4d and filesize < 400KB and ( 1 of ($x*) or all of ($a*) )
      and not 1 of ($fp*)
}