YARA · SEKOIA.IO Community

SEKOIA_Apt_Kimsuky_Vbs

VBS files used by Kimsuky

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

Author: Sekoia.io
Date: 2024-09-23
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

VBS files used by Kimsuky

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

apt-kimsuky-vbs.yarDetection Rule License 1.1

rule SEKOIA_Apt_Kimsuky_Vbs : FILE
{
	meta:
		description = "VBS files used by Kimsuky"
		author = "Sekoia.io"
		id = "3f92dbda-2ddb-4fa3-a587-743f65ced9e4"
		date = "2024-09-23"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_kimsuky_vbs.yar#L1-L23"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "12386be22ca82fce98a83a5a19e632bc"
		hash = "7b5783d42240651af78ebf7e01b31fe8"
		hash = "ff7d68e5fb253664ce64c85457b28041"
		hash = "622358469e5e24114dd0eb03da815576"
		hash = "edbb2aa40408e2a7936067ace38b445b"
		hash = "73ed9b012785dc3b3ee33aa52700cfe4"
		logic_hash = "b4a05a50c8223198082f6f6aa7309cc19b019738fb99e37c6f2140b8ef7cecc9"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = ")):Next:Execute " ascii
		$ = "=\"\":" ascii
		$ = "\":for "

	condition:
		all of them and filesize < 10KB
}

Strings (3 patterns)

Identifier	Type	Value	Modifiers
$	text	")):Next:Execute "	ascii
$	text	"=\"\":"	ascii
$	text	"\":for "

Condition

all of them and filesize < 10KB

In plain words (Heuristic)

The file must be smaller than 10KB (a cheap guard that skips large files).
All patterns in the rule must match.

Test this rule in your browser

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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).

12386be22ca82fce98a83a5a19e632bc
7b5783d42240651af78ebf7e01b31fe8
ff7d68e5fb253664ce64c85457b28041
622358469e5e24114dd0eb03da815576
edbb2aa40408e2a7936067ace38b445b
73ed9b012785dc3b3ee33aa52700cfe4

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: 3f92dbda-2ddb-4fa3-a587-743f65ced9e4

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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