APT_APT29_NOBELIUM_Malware_May21_2

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

Detects malware used by APT29 / NOBELIUM

rule APT_APT29_NOBELIUM_Malware_May21_2 {
   meta:
      description = "Detects malware used by APT29 / NOBELIUM"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://www.microsoft.com/security/blog/2021/05/28/breaking-down-nobeliums-latest-early-stage-toolset/"
      date = "2021-05-29"
      hash1 = "292e5b0a12fea4ff3fc02e1f98b7a370f88152ce71fe62670dd2f5edfaab2ff8"
      hash2 = "776014a63bf3cc7034bd5b6a9c36c75a930b59182fe232535bb7a305e539967b"
      id = "b1462b4b-227f-5aeb-92ea-bda6a86831c7"
   strings:
      $op1 = { 48 03 c8 42 0f b6 04 21 88 03 0f b6 43 01 8b c8 83 e0 0f 48 83 e1 f0 48 03 c8 }
      $op2 = { 48 03 c8 42 0f b6 04 21 88 43 01 41 0f b6 c7 8b c8 83 e0 0f 48 83 e1 f0 48 03 c8 }
      $op3 = { 45 0f b6 43 ff 41 8b c2 99 44 88 03 41 0f b6 2b 83 e2 03 03 c2 40 88 6b 01 }
   condition:
      filesize < 2200KB and
      all of them
}

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

d98b380d-3b99-40c6-a0f2-032d4e0e5f70

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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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