APT_MAL_Ke3chang_Ketrican_Jun20_1

YARA detection rule by Florian Roth (Nextron Systems) · NOASSERTION

Detects Ketrican malware

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
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

0fe17e4c-6fa2-462f-941e-35e9a7dae3d2

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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