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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_VULN_PHP_Hack_Backdoored_Phpass_May21

Detects backdoored PHP phpass version

GenericSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Christian Burkard
Date
2022-05-24
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects backdoored PHP phpass version

It defines 1 patterns (1 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
vuln-php-hack-backdoored-phpass-may21.yarDetection Rule License 1.1
rule SIGNATURE_BASE_VULN_PHP_Hack_Backdoored_Phpass_May21 : FILE
{
	meta:
		description = "Detects backdoored PHP phpass version"
		author = "Christian Burkard"
		id = "da13924c-0448-589c-bb2a-ee09736a5602"
		date = "2022-05-24"
		modified = "2023-12-05"
		reference = "https://twitter.com/s0md3v/status/1529005758540808192"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/vul_backdoor_antitheftweb.yar#L2-L14"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "d9669dadc698c6fa63d61857f9ada16a9303aa8bf4139bec75104f2e9f00a36a"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$x1 = "file_get_contents(\"http://anti-theft-web.herokuapp.com/hacked/$access/$secret\")" ascii

	condition:
		filesize < 30KB and $x1
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$x1text"file_get_contents(\"http://anti-theft-web.herokuapp.com/hacked/$access/$secret\")"ascii

Condition

filesize < 30KB and $x1

In plain words (Heuristic)

  • The file must be smaller than 30KB (a cheap guard that skips large files).
  • Pattern $x1 must be present.

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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References

Licence & attribution

Author: Christian Burkard

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: da13924c-0448-589c-bb2a-ee09736a5602

Tags:FILE

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