APT_NK_MAL_M_Hunting_VEILEDSIGNAL_1

YARA detection rule by Mandiant · NOASSERTION

Detects VEILEDSIGNAL malware

rule APT_NK_MAL_M_Hunting_VEILEDSIGNAL_1 {
   meta:
      description = "Detects VEILEDSIGNAL malware"
      author = "Mandiant"
      score = 75
      disclaimer = "This rule is meant for hunting and is not tested to run in a production environment"
      hash1 = "404b09def6054a281b41d309d809a428"
      hash2 = "c6441c961dcad0fe127514a918eaabd4"
      reference = "https://www.mandiant.com/resources/blog/3cx-software-supply-chain-compromise"
      date = "2023-04-20"
      id = "3e7c92fe-a7bd-5180-9935-4f98f2b64e2b"
   strings:
      $rh1 = { 68 5D 7A D2 2C 3C 14 81 2C 3C 14 81 2C 3C 14 81 77 54 10 80 26 3C 14 81 77 54 17 80 29 3C 14 81 77 54 11 80 AB 3C 14 81 D4 4C 11 80 33 3C 14 81 D4 4C 10 80 22 3C 14 81 D4 4C 17 80 25 3C 14 81 77 54 15 80 27 3C 14 81 2C 3C 15 81 4B 3C 14 81 94 4D 1D 80 28 3C 14 81 94 4D 14 80 2D 3C 14 81 94 4D 16 80 2D 3C 14 81 }
      $rh2 = { 00 E5 A0 2B 44 84 CE 78 44 84 CE 78 44 84 CE 78 1F EC CA 79 49 84 CE 78 1F EC CD 79 41 84 CE 78 1F EC CB 79 C8 84 CE 78 BC F4 CA 79 4A 84 CE 78 BC F4 CD 79 4D 84 CE 78 BC F4 CB 79 65 84 CE 78 1F EC CF 79 43 84 CE 78 44 84 CF 78 22 84 CE 78 FC F5 C7 79 42 84 CE 78 FC F5 CE 79 45 84 CE 78 FC F5 CC 79 45 84 CE 78}
      $rh3 = { DA D2 21 22 9E B3 4F 71 9E B3 4F 71 9E B3 4F 71 C5 DB 4C 70 94 B3 4F 71 C5 DB 4A 70 15 B3 4F 71 C5 DB 4B 70 8C B3 4F 71 66 C3 4B 70 8C B3 4F 71 66 C3 4C 70 8F B3 4F 71 C5 DB 49 70 9F B3 4F 71 66 C3 4A 70 B0 B3 4F 71 C5 DB 4E 70 97 B3 4F 71 9E B3 4E 71 F9 B3 4F 71 26 C2 46 70 9F B3 4F 71 26 C2 B0 71 9F B3 4F 71 9E B3 D8 71 9F B3 4F 71 26 C2 4D 70 9F B3 4F 71 }
      $rh4 = { CB 8A 35 66 8F EB 5B 35 8F EB 5B 35 8F EB 5B 35 D4 83 5F 34 85 EB 5B 35 D4 83 58 34 8A EB 5B 35 D4 83 5E 34 09 EB 5B 35 77 9B 5E 34 92 EB 5B 35 77 9B 5F 34 81 EB 5B 35 77 9B 58 34 86 EB 5B 35 D4 83 5A 34 8C EB 5B 35 8F EB 5A 35 D3 EB 5B 35 37 9A 52 34 8C EB 5B 35 37 9A 58 34 8E EB 5B 35 37 9A 5B 34 8E EB 5B 35 37 9A 59 34 8E EB 5B 35 }
   condition:
      uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550 and 1 of ($rh*)
}

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

9cd9d935-fde9-4dbd-9492-09c53c29a0c8

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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

[[ reason ]]

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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.

[[ reason ]]

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

[[ currentRule.title ]]

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