Skip to content

YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_EXPL_SUSP_JS_POC_RSC_Detector_Payloads_Dec25

Detects RCE indicators related to the proof-of-concept code for the React Server Remote Code Execution Vulnerability (CVE-2025-55182) as used in the RSC Detector browser extension but could be used in other JavaScript based PoC code as well

ExploitSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2025-12-06
Modified
2026-05-15
Score / Quality
70 / 85

What this rule detects

Detects RCE indicators related to the proof-of-concept code for the React Server Remote Code Execution Vulnerability (CVE-2025-55182) as used in the RSC Detector browser extension but could be used in other JavaScript based PoC code as well

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

expl-susp-js-poc-rsc-detector-payloads-dec25.yarDetection Rule License 1.1
rule SIGNATURE_BASE_EXPL_SUSP_JS_POC_RSC_Detector_Payloads_Dec25 : CVE_2025_55182
{
	meta:
		description = "Detects RCE indicators related to the proof-of-concept code for the React Server Remote Code Execution Vulnerability (CVE-2025-55182) as used in the RSC Detector browser extension but could be used in other JavaScript based PoC code as well"
		author = "Florian Roth"
		id = "98887e97-2dd4-5777-9fab-02805035de14"
		date = "2025-12-06"
		modified = "2026-05-15"
		reference = "https://github.com/mrknow001/RSC_Detector"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/react_pocs_indicators_dec25.yar#L106-L123"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "b51f4028662795ffcbf4c17c1b2cbad35a8fa64104aa5cfdaf24b13e9663eb09"
		score = 70
		quality = 85
		tags = "CVE-2025-55182"

	strings:
		$s1 = "process.mainModule.require('child_process').execSync("
		$s2 = ").toString('base64');"
		$f1 = "echo vulnerability_test"

	condition:
		all of ( $s* ) and not 1 of ( $f* )
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"process.mainModule.require('child_process').execSync("
$s2text").toString('base64');"
$f1text"echo vulnerability_test"

Condition

all of ( $s* ) and not 1 of ( $f* )

In plain words (Heuristic)

  • All patterns in ( $s* ) must match.
  • At least 1 patterns in ( $f* ) must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

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

Open in editor

References

Licence & attribution

Author: Florian Roth

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: 98887e97-2dd4-5777-9fab-02805035de14

Tags:CVE_2025_55182