YARA · SEKOIA.IO Community

SEKOIA_Apt_Kimsuky_Validator_Strings

Detects Kimsuky validator

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

Author: Sekoia.io
Date: 2024-06-11
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects Kimsuky validator

Associated malware family: Kimsuky.

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-kimsuky-validator-strings.yarDetection Rule License 1.1

rule SEKOIA_Apt_Kimsuky_Validator_Strings : FILE
{
	meta:
		description = "Detects Kimsuky validator"
		author = "Sekoia.io"
		id = "e055f2d4-8318-4342-812e-0f621d7886b4"
		date = "2024-06-11"
		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_validator_strings.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "a627dae8c12f0f6f8472bc12b8e1a85137f92f6e389f817ab9023c90720a42b0"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "%s%sc %s >%s 2>&1" wide
		$ = "%s%sc %s 2>%s" wide

	condition:
		uint16be( 0 ) == 0x4d5a and all of them
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$	text	"%s%sc %s >%s 2>&1"	wide
$	text	"%s%sc %s 2>%s"	wide

Condition

uint16be( 0 ) == 0x4d5a and all of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
All patterns in the rule must match.

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References

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

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: e055f2d4-8318-4342-812e-0f621d7886b4

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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