Skip to content
yararules.org
Menu

YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_Unknown_Discord_Characteristics_Jan22_1

Detects unknown malware with a few indicators also found in Wiper malware

MalwareSignature 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 unknown malware with a few indicators also found in Wiper malware

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
mal-unknown-discord-characteristics-jan22-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_Unknown_Discord_Characteristics_Jan22_1 : FILE
{
	meta:
		description = "Detects unknown malware with a few indicators also found in Wiper malware"
		author = "Florian Roth (Nextron Systems)"
		id = "23ee5319-6a72-517b-8ea0-55063b6b862c"
		date = "2022-01-16"
		modified = "2023-12-05"
		reference = "https://www.microsoft.com/security/blog/2022/01/15/destructive-malware-targeting-ukrainian-organizations/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_ua_wiper_whispergate.yar#L103-L119"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "dcbbae5a1c61dbbbb7dcd6dc5dd1eb1169f5329958d38b58c3fd9384081c9b78"
		logic_hash = "f9cf4a15be0ab35a0d0f0c9b1a191f623f905c8fc9da651872de7c025a27a806"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$x1 = "xownxloxadDxatxxax" wide
		$s2 = "https://cdn.discordapp.com/attachments/" wide

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 1000KB and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$x1text"xownxloxadDxatxxax"wide
$s2text"https://cdn.discordapp.com/attachments/"wide

Condition

uint16( 0 ) == 0x5a4d and filesize < 1000KB and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 1000KB (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

Sample hashes

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

  • dcbbae5a1c61dbbbb7dcd6dc5dd1eb1169f5329958d38b58c3fd9384081c9b78

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: 23ee5319-6a72-517b-8ea0-55063b6b862c

Tags:FILE

Related rules