YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_APT29_NOBELIUM_LNK_NV_Link_May21_2

Detects NV Link as used by NOBELIUM group

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

Author: Florian Roth (Nextron Systems)
Date: 2021-05-29
Modified: 2025-03-21
Score / Quality: 75 / 85

What this rule detects

Detects NV Link as used by NOBELIUM group

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-apt29-nobelium-lnk-nv-link-may21-2.yarDetection Rule License 1.1

rule SIGNATURE_BASE_APT_APT29_NOBELIUM_LNK_NV_Link_May21_2 : FILE
{
	meta:
		description = "Detects NV Link as used by NOBELIUM group"
		author = "Florian Roth (Nextron Systems)"
		id = "52c2caf9-13df-5614-9c9e-afcd76ec77f9"
		date = "2021-05-29"
		modified = "2025-03-21"
		reference = "https://www.microsoft.com/security/blog/2021/05/28/breaking-down-nobeliums-latest-early-stage-toolset/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_apt29_nobelium_may21.yar#L85-L97"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "5eee9df368da3fc98c00a0f8c65a7f3bd5b812342082be58054b272b5bb03455"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$s1 = "RegisterOCX BOOM" ascii wide
		$s2 = "cmd.exe /c start BOOM.exe" ascii wide

	condition:
		filesize < 5000KB and 1 of them
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$s1	text	"RegisterOCX BOOM"	ascii wide
$s2	text	"cmd.exe /c start BOOM.exe"	ascii wide

Condition

filesize < 5000KB and 1 of them

In plain words (Heuristic)

The file must be smaller than 5000KB (a cheap guard that skips large files).
At least 1 patterns in the rule must match.

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References

https://www.microsoft.com/security/blog/2021/05/28/breaking-down-nobeliums-latest-early-stage-toolset/

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: 52c2caf9-13df-5614-9c9e-afcd76ec77f9

Tags:FILE

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