MAL_Emotet_Jan20_1

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

Detects Emotet malware

import "pe"
rule MAL_Emotet_Jan20_1 {
   meta:
      description = "Detects Emotet malware"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://app.any.run/tasks/5e81638e-df2e-4a5b-9e45-b07c38d53929/"
      date = "2020-01-29"
      hash1 = "e7c22ccdb1103ee6bd15c528270f56913bb2f47345b360802b74084563f1b73d"
      id = "334ae7e5-0a46-5e95-bf53-0f343db4e4de"
   strings:
      $op0 = { 74 60 8d 34 18 eb 54 03 c3 50 ff 15 18 08 41 00 }
      $op1 = { 03 fe 66 39 07 0f 85 2a ff ff ff 8b 4d f0 6a 20 }
      $op2 = { 8b 7d fc 0f 85 49 ff ff ff 85 db 0f 84 d1 }
   condition:
      uint16(0) == 0x5a4d and filesize <= 200KB and (
         pe.imphash() == "009889c73bd2e55113bf6dfa5f395e0d" or
         1 of them
      )
}

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

f6395103-0f86-463a-a2ba-0bd565d72e29

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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 ]]

What do these messages mean?

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

[[ currentRule.title ]]

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