YARA · SEKOIA.IO Community

SEKOIA_Downloader_Kimsuky_Lnk

Detect Kimsuky LNK

MalwareKimsukySEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X

Author: Sekoia.io
Date: 2024-07-16
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detect Kimsuky LNK

Associated malware family: Kimsuky.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

downloader-kimsuky-lnk.yarDetection Rule License 1.1

rule SEKOIA_Downloader_Kimsuky_Lnk
{
	meta:
		description = "Detect Kimsuky LNK"
		author = "Sekoia.io"
		id = "3831d115-7874-4bc9-aeb4-d2cb9bc2b5c9"
		date = "2024-07-16"
		modified = "2024-12-19"
		reference = "https://blogs.jpcert.or.jp/en/2024/07/attack-activities-by-kimsuky-targeting-japanese-organizations.html"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/downloader_kimsuky_lnk.yar#L1-L22"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "3065b8e4bb91b4229d1cea671e8959da8be2e7482067e1dd03519c882738045e"
		hash = "d912f49d24792aa7197509f76e2097ac3858cde23199e1b40f2516948d39c589"
		hash = "e936445935c4a636614f7113e4121695a5f3e4a6c137b7cdcceb6f629aa957c4"
		hash = "fe156159a26f8b7c140db61dd8b136e1c8103a800748fe9b70a3a3fdf179d3c3"
		logic_hash = "3512c8c21203a015b316c2a993db1a8c10420df06ea97d84a6e350550a628230"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "AType: Text Document" wide
		$ = "Size: 5.23 KB" wide
		$ = "Date modified: 01/02/2020 11:23" wide

	condition:
		all of them
}

Strings (3 patterns)

Identifier	Type	Value	Modifiers
$	text	"AType: Text Document"	wide
$	text	"Size: 5.23 KB"	wide
$	text	"Date modified: 01/02/2020 11:23"	wide

Condition

all of them

In plain words (Heuristic)

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://blogs.jpcert.or.jp/en/2024/07/attack-activities-by-kimsuky-targeting-japanese-organizations.html

Sample hashes

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

3065b8e4bb91b4229d1cea671e8959da8be2e7482067e1dd03519c882738045e
d912f49d24792aa7197509f76e2097ac3858cde23199e1b40f2516948d39c589
e936445935c4a636614f7113e4121695a5f3e4a6c137b7cdcceb6f629aa957c4
fe156159a26f8b7c140db61dd8b136e1c8103a800748fe9b70a3a3fdf179d3c3

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: 3831d115-7874-4bc9-aeb4-d2cb9bc2b5c9

Metadata

version	1.0
classification	TLP:CLEAR

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