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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_APT29_NOBELIUM_Malware_May21_3

Detects malware used by APT29 / NOBELIUM

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 malware used by APT29 / NOBELIUM

It defines 5 patterns (1 text, 4 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-apt29-nobelium-malware-may21-3.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_APT29_NOBELIUM_Malware_May21_3 : FILE
{
	meta:
		description = "Detects malware used by APT29 / NOBELIUM"
		author = "Florian Roth (Nextron Systems)"
		id = "89cb6884-4242-5b5a-b0ac-b31041dd261c"
		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#L278-L300"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "2a352380d61e89c89f03f4008044241a38751284995d000c73acf9cad38b989e"
		logic_hash = "472acd1d6daf3480de59ecd3fa038d644e339dcc979cf7e56617eadc6cb32dc5"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$s1 = "Win32Project1.dll" ascii fullword
		$op1 = { 59 c3 6a 08 68 70 5e 01 10 e8 d2 8c ff ff 8b 7d 08 8b c7 c1 f8 05 }
		$op2 = { 8d 4d f0 e8 c4 12 00 00 68 64 5b 01 10 8d 45 f0 c7 45 f0 6c 01 01 10 50 e8 ea 13 00 00 cc }
		$op4 = { 40 c3 8b 65 e8 e8 a6 86 ff ff cc 6a 0c 68 88 60 01 10 e8 b0 4d ff ff }
		$xc1 = { 25 73 25 73 00 00 00 00 2F 65 2C 20 00 00 00 00
               43 00 3A 00 5C 00 77 00 69 00 6E 00 64 00 6F 00
               77 00 73 00 5C 00 65 00 78 00 70 00 6C 00 6F 00
               72 00 65 00 72 00 2E 00 65 00 78 00 65 }

	condition:
		filesize < 3000KB and ( $xc1 or 3 of them )
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$s1text"Win32Project1.dll"ascii fullword
$op1hex{ 59 c3 6a 08 68 70 5e 01 10 e8 d2 8c ff ff 8b 7d 08 8b c7 c1 f8 05 }
$op2hex{ 8d 4d f0 e8 c4 12 00 00 68 64 5b 01 10 8d 45 f0 c7 45 f0 6c 01 01 10 50 e8 ea 13 00 00 cc }
$op4hex{ 40 c3 8b 65 e8 e8 a6 86 ff ff cc 6a 0c 68 88 60 01 10 e8 b0 4d ff ff }
$xc1hex{ 25 73 25 73 00 00 00 00 2F 65 2C 20 00 00 00 00 43 00 3A 00 5C 00 77 00 69 00 6E 00 64 00 6F 00 77 00 73 00 5C 00 65 00 78 00 70 …

Condition

filesize < 3000KB and ( $xc1 or 3 of them )

In plain words (Heuristic)

  • The file must be smaller than 3000KB (a cheap guard that skips large files).
  • At least 3 patterns in the rule must match.
  • Pattern $xc1 must be present.

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References

Sample hashes

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

  • 2a352380d61e89c89f03f4008044241a38751284995d000c73acf9cad38b989e

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: 89cb6884-4242-5b5a-b0ac-b31041dd261c

Tags:FILE

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