Skip to content
yararules.org
Menu

YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_EXPL_LIBCUE_CVE_2023_43641_Oct23_1

Detects a suspicious .cue file that could be an exploitation attempt of libcue vulnerability CVE-2023-43641

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2023-10-27
Modified
2023-12-05
Score / Quality
70 / 85

What this rule detects

Detects a suspicious .cue file that could be an exploitation attempt of libcue vulnerability CVE-2023-43641

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
susp-expl-libcue-cve-2023-43641-oct23-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_EXPL_LIBCUE_CVE_2023_43641_Oct23_1 : CVE_2023_43641 FILE
{
	meta:
		description = "Detects a suspicious .cue file that could be an exploitation attempt of libcue vulnerability CVE-2023-43641"
		author = "Florian Roth"
		id = "34fcf80c-adcd-55c0-9fb4-261d20f61fa6"
		date = "2023-10-27"
		modified = "2023-12-05"
		reference = "https://github.com/github/securitylab/blob/main/SecurityExploits/libcue/track_set_index_CVE-2023-43641/README.md"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_libcue_cve_2023_43641.yar#L2-L17"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "a2cd3c1b0b3551ffb24bf7704c37c1be6c1a9655c74447d2f7f94540dd0ab188"
		score = 70
		quality = 85
		tags = "CVE-2023-43641, FILE"

	strings:
		$a1 = "TRACK "
		$a2 = "FILE "
		$s1 = "INDEX 4294"

	condition:
		filesize < 100KB and all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$a1text"TRACK "
$a2text"FILE "
$s1text"INDEX 4294"

Condition

filesize < 100KB and all of them

In plain words (Heuristic)

  • The file must be smaller than 100KB (a cheap guard that skips large files).
  • All patterns in the rule 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: 34fcf80c-adcd-55c0-9fb4-261d20f61fa6

Tags:CVE_2023_43641FILE

Related rules