SUSP_PE_Discord_Attachment_Oct21_1

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

Detects suspicious executable with reference to a Discord attachment (often used for malware hosting on a legitimate FQDN)

rule SUSP_PE_Discord_Attachment_Oct21_1 {
   meta:
      description = "Detects suspicious executable with reference to a Discord attachment (often used for malware hosting on a legitimate FQDN)"
      author = "Florian Roth (Nextron Systems)"
      reference = "Internal Research"
      date = "2021-10-12"
      score = 70
      id = "7c217350-4a35-505d-950d-1bc989c14bc2"
   strings:
      $x1 = "https://cdn.discordapp.com/attachments/" ascii wide
   condition:
      uint16(0) == 0x5a4d
      and filesize < 5000KB 
      and 1 of them
}

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

4ea23b5e-1737-4efe-afef-d8883f3fe7de

Propose edits, view related rules, and engage with the community through comments.

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 ]]

What does this mean?

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 ]]

What do these messages mean?

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

[[ currentRule.title ]]

Community Discussion