YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_HKTL_Wiper_Whispergate_Stage3_Jan22

Detects reversed stage3 related to Ukrainian wiper malware

APT / threat actorWhispergateSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X

Author: Florian Roth (Nextron Systems)
Date: 2022-01-16
Modified: 2023-12-05
Score / Quality: 75 / 85

What this rule detects

Detects reversed stage3 related to Ukrainian wiper malware

Associated malware family: Whispergate.

It defines 2 patterns (1 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-hktl-wiper-whispergate-stage3-jan22.yarDetection Rule License 1.1

rule SIGNATURE_BASE_APT_HKTL_Wiper_Whispergate_Stage3_Jan22 : FILE
{
	meta:
		description = "Detects reversed stage3 related to Ukrainian wiper malware"
		author = "Florian Roth (Nextron Systems)"
		id = "d5d562cd-03ef-5450-8044-3f538cea32d0"
		date = "2022-01-16"
		modified = "2023-12-05"
		reference = "https://twitter.com/juanandres_gs/status/1482827018404257792"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_ua_wiper_whispergate.yar#L59-L74"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "9ef7dbd3da51332a78eff19146d21c82957821e464e8133e9594a07d716d892d"
		logic_hash = "b06536b6a6eebd5fb398ba2617bf68a5b2c4b0035766b3cd0fc03d95019891ec"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$xc1 = { 65 31 63 70 00 31 79 72 61 72 62 69 4c 73 73 61 6c 43 00 6e 69 61 4d }
		$s1 = "lld." wide

	condition:
		uint16( filesize -2 ) == 0x4d5a and filesize < 5000KB and all of them
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$xc1	hex	{ 65 31 63 70 00 31 79 72 61 72 62 69 4c 73 73 61 6c 43 00 6e 69 61 4d }
$s1	text	"lld."	wide

Condition

uint16( filesize -2 ) == 0x4d5a and filesize < 5000KB and all of them

In plain words (Heuristic)

The file must be smaller than 5000KB (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://twitter.com/juanandres_gs/status/1482827018404257792

Sample hashes

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

9ef7dbd3da51332a78eff19146d21c82957821e464e8133e9594a07d716d892d

Licence & attribution

Author: Florian Roth (Nextron Systems)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

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: d5d562cd-03ef-5450-8044-3f538cea32d0

Tags:FILE

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