webshell_php_strings_susp_ren

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

typical webshell strings, suspicious

rule webshell_php_strings_susp_ren: WEBSHELL PROD {
  meta:
    description = "typical webshell strings, suspicious"
    license     = "https://creativecommons.org/licenses/by-nc/4.0/"
    author      = "Arnim Rupp"
    date        = "2021/01/12"
    hash        = "0dd568dbe946b5aa4e1d33eab1decbd71903ea04"
    score       = 50

  strings:
    $sstring1 = "eval(\"?>\"" nocase wide ascii

  condition:
    filesize < 700KB and
    capa_php_old_safe and
    not php_false_positive and
    (2 of ($sstring*) or (1 of ($sstring*) and capa_php_input))
}

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

82b2d74b-2638-48d0-b30a-8e6e7c6d9d29

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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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