APT15_Malware_Mar18_BS2005

rule APT15_Malware_Mar18_BS2005 {
   meta:
      description = "Detects malware from APT 15 report by NCC Group"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://goo.gl/HZ5XMN"
      date = "2018-03-10"
      hash1 = "750d9eecd533f89b8aa13aeab173a1cf813b021b6824bc30e60f5db6fa7b950b"
      id = "700bbe14-d79e-5a35-aab3-31eacd5bd950"
   strings:
      $x1 = "AAAAKQAASCMAABi+AABnhEBj8vep7VRoAEPRWLweGc0/eiDrXGajJXRxbXsTXAcZAABK4QAAPWwAACzWAAByrg==" fullword ascii
      $x2 = "AAAAKQAASCMAABi+AABnhKv3kXJJousn5YzkjGF46eE3G8ZGse4B9uoqJo8Q2oF0AABK4QAAPWwAACzWAAByrg==" fullword ascii

      $a1 = "http://%s/content.html?id=%s" fullword ascii
      $a2 = "http://%s/main.php?ssid=%s" fullword ascii
      $a3 = "http://%s/webmail.php?id=%s" fullword ascii
      $a9 = "http://%s/error.html?tab=%s" fullword ascii

      $s1 = "%s\\~tmp.txt" fullword ascii
      $s2 = "%s /C %s >>\"%s\" 2>&1" fullword ascii
      $s3 = "DisableFirstRunCustomize" fullword ascii
   condition:
      uint16(0) == 0x5a4d and filesize < 200KB and (
         1 of ($x*) or
         2 of them
      )
}