MAL_Unknown_Discord_Characteristics_Jan22_1_RID3748

YARA detection rule by Florian Roth · CC-BY-NC https://creativecommons.org/licenses/by-nc/4.0/

Detects unknown malware with a few indicators also found in Wiper malware

rule MAL_Unknown_Discord_Characteristics_Jan22_1_RID3748 : DEMO EXE FILE MAL {
   meta:
      description = "Detects unknown malware with a few indicators also found in Wiper malware"
      author = "Florian Roth"
      reference = "https://www.microsoft.com/security/blog/2022/01/15/destructive-malware-targeting-ukrainian-organizations/"
      date = "2022-01-16 17:31:51"
      score = 75
      customer = "demo"
      license = "CC-BY-NC https://creativecommons.org/licenses/by-nc/4.0/"
      hash1 = "dcbbae5a1c61dbbbb7dcd6dc5dd1eb1169f5329958d38b58c3fd9384081c9b78"
      tags = "DEMO, EXE, FILE, MAL"
      minimum_yara = "3.5.0"
      
   strings:
      $x1 = "xownxloxadDxatxxax" wide
      $s2 = "https://cdn.discordapp.com/attachments/" wide
   condition: 
      uint16 ( 0 ) == 0x5a4d and filesize < 1000KB and all of them
}

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

ee6ccfc6-ab7a-4c4a-8a3f-a8b590a8d784

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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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