KR_Target_Malware_Aug17

rule KR_Target_Malware_Aug17 {
   meta:
      description = "Detects malware that targeted South Korea in Aug 2017 - file MRDqsbuEqGxrgqtbXU.exe"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://twitter.com/eyalsela/status/900250203097354240"
      date = "2017-08-23"
      hash1 = "82cada01643a42c8cd9600b8c33f3760d15e5eb6fabec2d531cf13cece095c78"
      id = "2a6a7921-953a-502c-9702-b27325b2c3b8"
   strings:
      $x1 = { 53 00 75 00 63 00 63 00 65 00 00 2F 53 00 6F 00
               6D 00 65 00 74 00 68 00 69 00 6E 00 67 00 20 00
               77 00 65 00 6E 00 74 00 20 00 77 00 72 00 6F 00
               6E 00 67 00 }

      $x2 = "lnVMODvjSfOQQnfiuFogghlL" fullword ascii
      $x3 = "E X I T  +R U N A S  /a P P d A T A " fullword ascii
      $x4 = "uSEsHELLeXECUTE gETeNTRYaSSEMBLY GET" fullword ascii
      $x5 = "ZahUKBXz" fullword wide
   condition:
      ( uint16(0) == 0x5a4d and
        filesize < 800KB and
        1 of them
      )
}