Quasar_RAT_1

rule Quasar_RAT_1 {
   meta:
      description = "Detects Quasar RAT"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://www.pwc.co.uk/cyber-security/pdf/cloud-hopper-annex-b-final.pdf"
      date = "2017-04-07"
      hash1 = "0774d25e33ca2b1e2ee2fafe3fdbebecefbf1d4dd99e6460f0bc8713dd0fd740"
      hash2 = "1ce40a89ef9d56fd32c00db729beecc17d54f4f7c27ff22f708a957cd3f9a4ec"
      hash3 = "515c1a68995557035af11d818192f7866ef6a2018aa13112fefbe08395732e89"
      hash4 = "f08db220df716de3d4f63f3007a03f902601b9b32099d6a882da87312f263f34"
      id = "36220de3-aa1a-5c34-adae-432d939c811e"
   strings:
      $s1 = "DoUploadAndExecute" fullword ascii
      $s2 = "DoDownloadAndExecute" fullword ascii
      $s3 = "DoShellExecute" fullword ascii
      $s4 = "set_Processname" fullword ascii

      $op1 = { 04 1e fe 02 04 16 fe 01 60 }
      $op2 = { 00 17 03 1f 20 17 19 15 28 }
      $op3 = { 00 04 03 69 91 1b 40 }
   condition:
      ( uint16(0) == 0x5a4d and filesize < 5000KB and all of ($s*) or all of ($op*) )
}