APT_MAL_Ke3chang_Ketrican_Jun20_1

rule APT_MAL_Ke3chang_Ketrican_Jun20_1 {
   meta:
      description = "Detects Ketrican malware"
      author = "Florian Roth (Nextron Systems)"
      reference = "BfV Cyber-Brief Nr. 01/2020"
      date = "2020-06-18"
      hash1 = "02ea0bc17875ab403c05b50205389065283c59e01de55e68cee4cf340ecea046"
      hash2 = "f3efa600b2fa1c3c85f904a300fec56104d2caaabbb39a50a28f60e0fdb1df39"
      id = "ccd8322e-c822-512a-9ac5-eabc9d09640b"
   strings:
      $xc1 = { 00 59 89 85 D4 FB FF FF 8B 85 D4 FB FF FF 89 45
               FC 68 E0 58 40 00 8F 45 FC E9 }

      $op1 = { 6a 53 58 66 89 85 24 ff ff ff 6a 79 58 66 89 85 }
      $op2 = { 8d 45 bc 50 53 53 6a 1c 8d 85 10 ff ff ff 50 ff }
   condition:
      uint16(0) == 0x5a4d and
      filesize < 300KB and
      1 of ($x*) or 2 of them
}