APT15_Malware_Mar18_MSExchangeTool

rule APT15_Malware_Mar18_MSExchangeTool {
   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 = "16b868d1bef6be39f69b4e976595e7bd46b6c0595cf6bc482229dbb9e64f1bce"
      id = "81b826b6-8c2e-5a8a-a626-9515d40dbbb0"
   strings:
      $s1 = "\\Release\\EWSTEW.pdb" ascii
      $s2 = "EWSTEW.exe" fullword wide
      $s3 = "Microsoft.Exchange.WebServices.Data" fullword ascii
      $s4 = "tmp.dat" fullword wide
      $s6 = "/v or /t is null" fullword wide
   condition:
      uint16(0) == 0x5a4d and filesize < 40KB and all of them
}