capa_hash_data_with_MD5

YARA detection rule by moritz.raabe@fireeye.com · Apache-2.0 License

hash data with MD5 (converted from capa rule)

rule capa_hash_data_with_MD5: CAPA {
  meta:
    description  = "hash data with MD5 (converted from capa rule)"
    namespace    = "data-manipulation/hashing/md5"
    author       = "moritz.raabe@fireeye.com"
    scope        = "function"
    reference    = "This YARA rule converted from capa rule: https://github.com/fireeye/capa-rules/blob/master/nursery/hash-data-with-md5.yml"
    capa_nursery = "True"
    comment      = "This rule is incomplete because a branch inside an Or-statement had an unsupported feature and was skipped => coverage is reduced compared to the original capa rule. "
    date         = "2021-05-17"
    minimum_yara = "3.8"
    license      = "Apache-2.0 License"

  strings:
    $num_ctr = { 01 23 45 67 }
    $num_cts = { 89 AB CD EF }
    $num_ctt = { FE DC BA 98 }
    $num_ctu = { 76 54 32 10 }
    $num_ctv = { F0 E1 D2 C3 }

  condition:
    capa_pe_file and
    (
      (
        $num_ctr
        and $num_cts
        and $num_ctt
        and $num_ctu
        and not $num_ctv
      )
    )
}

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

83d877f3-9e11-4a4f-9952-5a7099b541fd

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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 ]]

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 ]]

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