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ELCEEF_Winrar_CVE_2025_8088_Exploit

Detects RAR archives exploiting CVE-2025-8088 in WinRAR

Exploitelceef yara-rulzMIT LicenseCompiles with YARA-X
Author
marcin@ulikowski.pl
Date
2025-08-18
Score / Quality
75 / 75

What this rule detects

Detects RAR archives exploiting CVE-2025-8088 in WinRAR

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
winrar-cve-2025-8088-exploit.yarMIT License
rule ELCEEF_Winrar_CVE_2025_8088_Exploit : CVE_2025_8088 FILE
{
	meta:
		description = "Detects RAR archives exploiting CVE-2025-8088 in WinRAR"
		author = "marcin@ulikowski.pl"
		id = "546e2858-c04a-5f3c-94b9-54d5b7f364b5"
		date = "2025-08-18"
		modified = "2025-08-18"
		reference = "https://www.welivesecurity.com/en/eset-research/update-winrar-tools-now-romcom-and-others-exploiting-zero-day-vulnerability/"
		source_url = "https://github.com/elceef/yara-rulz/blob/5683b294a12cf0c875b624933586029ae43a852f/rules/WinRAR_CVE_2025_8088.yara#L1-L17"
		license_url = "https://github.com/elceef/yara-rulz/blob/5683b294a12cf0c875b624933586029ae43a852f/LICENSE"
		hash = "2a8fafa01f6d3863c87f20905736ebab28d6a5753ab708760c0b6cf3970828c3"
		logic_hash = "f3181b92294ad68467b6ce121170a91b423604fd152f27899a2f34879266e9d8"
		score = 75
		quality = 75
		tags = "CVE-2025-8088, FILE"

	strings:
		$ = { 00 03 53 54 4d [2-3] 3a ( 5c | 2e ) ( 5c | 2e ) ( 5c | 2e ) ( 5c | 2e ) }

	condition:
		uint32be( 0 ) == 0x52617221 and all of them
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$hex{ 00 03 53 54 4d [2-3] 3a ( 5c | 2e ) ( 5c | 2e ) ( 5c | 2e ) ( 5c | 2e ) }

Condition

uint32be( 0 ) == 0x52617221 and all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

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References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 2a8fafa01f6d3863c87f20905736ebab28d6a5753ab708760c0b6cf3970828c3

Licence & attribution

Author: marcin@ulikowski.pl

Source repository: elceef yara-rulz @ 5683b294a1

Licence: MIT License (repository licence)

Copyright notice: Copyright (c) 2022 Marcin Ulikowski

Original rule

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

Rule id: 546e2858-c04a-5f3c-94b9-54d5b7f364b5

Tags:CVE_2025_8088FILE

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