YARA · SEKOIA.IO Community

SEKOIA_Apt_Gamaredon_Lnk_Spreader

Detects LNK generated by Gamaredon LNK spreader

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X

Author: Sekoia.io
Date: 2023-06-19
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects LNK generated by Gamaredon LNK spreader

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-gamaredon-lnk-spreader.yarDetection Rule License 1.1

rule SEKOIA_Apt_Gamaredon_Lnk_Spreader : FILE
{
	meta:
		description = "Detects LNK generated by Gamaredon LNK spreader"
		author = "Sekoia.io"
		id = "2866ca1d-c094-49ba-b1de-ff9a60680e28"
		date = "2023-06-19"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_gamaredon_lnk_spreader.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "7d6264ce74e298c6d58803f9ebdb4a40b4ce909d02fd62f54a1f8d682d73519a"
		logic_hash = "e8a82fd4cdce7bc888184ccf8d182ab5bb53e30de04b02b7c63379bae5d21b1f"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "windoWSTYLE hiDdEn -NOlOgo iEX" wide nocase
		$ = "(IeX (geT-coNtEnT" wide nocase

	condition:
		uint32be( 0 ) == 0x4C000000 and filesize < 3KB and all of them
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$	text	"windoWSTYLE hiDdEn -NOlOgo iEX"	wide nocase
$	text	"(IeX (geT-coNtEnT"	wide nocase

Condition

uint32be( 0 ) == 0x4C000000 and filesize < 3KB and all of them

In plain words (Heuristic)

The file must start with the Windows shortcut (LNK) header.
The file must be smaller than 3KB (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

https://github.com/SEKOIA-IO/Community

Sample hashes

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

7d6264ce74e298c6d58803f9ebdb4a40b4ce909d02fd62f54a1f8d682d73519a

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

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: 2866ca1d-c094-49ba-b1de-ff9a60680e28

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

SEKOIA_Apt_Gobrat_2
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-09-10
SEKOIA_Apt_Icepeony_Icecache
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-10-21
SEKOIA_Apt_Icepeony_Iceevent
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-10-21
SEKOIA_Apt_Kimsuky_Fpspy
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-09-27
SEKOIA_Apt_Kimsuky_Klogexe
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-09-27
SEKOIA_Apt_Kimsuky_Powershell
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-09-23
SEKOIA_Apt_Kimsuky_Powershell_Dropper_Strings
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-06-11
SEKOIA_Apt_Kimsuky_Toddlershark_Obfuscated
APT / threat actorSEKOIA.IO Community· Sekoia.io· 2024-03-06