YARA · SEKOIA.IO Community

SEKOIA_Apt_Kimsuky_Sharptongue_Vbslauncher_Strings

Detects VBS Launchers used by SharpTongue

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

Author: Sekoia.io
Date: 2022-07-29
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects VBS Launchers used by SharpTongue

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-sharptongue-vbslauncher-strings.yarDetection Rule License 1.1

rule SEKOIA_Apt_Kimsuky_Sharptongue_Vbslauncher_Strings : FILE
{
	meta:
		description = "Detects VBS Launchers used by SharpTongue"
		author = "Sekoia.io"
		id = "82bd648c-2961-4945-950e-8fb1e4650338"
		date = "2022-07-29"
		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_sharptongue_vbslauncher_strings.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "9e1383a71b4ab5ca1de5016061f0e9c83e6f3e1a41eef25dae15cd1aab8b581f"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "powershell" ascii wide
		$ = "On Error Resume Next" ascii wide
		$ = "oShell.run(tmp0,0" ascii wide

	condition:
		all of them and filesize < 10KB
}

Strings (3 patterns)

Identifier	Type	Value	Modifiers
$	text	"powershell"	ascii wide
$	text	"On Error Resume Next"	ascii wide
$	text	"oShell.run(tmp0,0"	ascii wide

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.

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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: 82bd648c-2961-4945-950e-8fb1e4650338

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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