webshell_php_generic_callback_ren

YARA detection rule by Arnim Rupp · https://creativecommons.org/licenses/by-nc/4.0/

php webshell having some kind of input and using a callback to execute the payload. restricted to small files or would give lots of false positives

rule webshell_php_generic_callback_ren: WEBSHELL PROD {
  meta:
    description = "php webshell having some kind of input and using a callback to execute the payload. restricted to small files or would give lots of false positives"
    license     = "https://creativecommons.org/licenses/by-nc/4.0/"
    author      = "Arnim Rupp"
    date        = "2021/01/14"
    hash        = "e98889690101b59260e871c49263314526f2093f"

  condition:
    not php_false_positive and
    not php_false_positive_tiny and
    capa_php_input and
    capa_php_callback and
    (
      filesize < 1000 or
      capa_gen_sus
    )
}

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

81ea9b64-58e5-486d-ac28-c336d967b570

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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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