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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_NVIDIA_LAPSUS_Leak_Compromised_Cert_Mar22_1

Detects a binary signed with the leaked NVIDIA certifcate and compiled after March 1st 2022

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X (with warnings)
Author
Florian Roth (Nextron Systems)
Date
2022-03-03
Modified
2022-03-04
Score / Quality
70 / 85

What this rule detects

Detects a binary signed with the leaked NVIDIA certifcate and compiled after March 1st 2022

Targets: Windows PE.

It has no patterns: the condition alone decides (modules, file properties or other rules). YARA modules used: pe.

YARA-X says: warning[deprecated_field]: field `number_of_signatures` is deprecated

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

susp-nvidia-lapsus-leak-compromised-cert-mar22-1.yarDetection Rule License 1.1
import "pe"

rule SIGNATURE_BASE_SUSP_NVIDIA_LAPSUS_Leak_Compromised_Cert_Mar22_1 : FILE
{
	meta:
		description = "Detects a binary signed with the leaked NVIDIA certifcate and compiled after March 1st 2022"
		author = "Florian Roth (Nextron Systems)"
		id = "8bc7460f-a1c4-5157-8c2d-34d3a6c9c7e9"
		date = "2022-03-03"
		modified = "2022-03-04"
		reference = "https://twitter.com/cyb3rops/status/1499514240008437762"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_nvidia_leaked_cert.yar#L4-L22"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "e7e9e58ec1e3922471ad3ffd4ad9fbb3ac4b3c3841c35d1cd8886607f3cf1ab9"
		score = 70
		quality = 85
		tags = "FILE"

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 100MB and pe.timestamp > 1646092800 and for any i in ( 0 .. pe.number_of_signatures ) : ( pe.signatures [ i ] . issuer contains "VeriSign Class 3 Code Signing 2010 CA" and ( pe.signatures [ i ] . serial == "43:bb:43:7d:60:98:66:28:6d:d8:39:e1:d0:03:09:f5" or pe.signatures [ i ] . serial == "14:78:1b:c8:62:e8:dc:50:3a:55:93:46:f5:dc:c5:18" ) )
}

Condition

uint16( 0 ) == 0x5a4d and filesize < 100MB and pe.timestamp > 1646092800 and for any i in ( 0 .. pe.number_of_signatures ) : ( pe.signatures [ i ] . issuer contains "VeriSign Class 3 Code Signing 2010 CA" and ( pe.signatures [ i ] . serial == "43:bb:43:7d:60:98:66:28:6d:d8:39:e1:d0:03:09:f5" or pe.signatures [ i ] . serial == "14:78:1b:c8:62:e8:dc:50:3a:55:93:46:f5:dc:c5:18" ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 100MB (a cheap guard that skips large files).
  • A for-loop checks a property over several matches or items.
  • Uses the pe module.
  • Checks the Authenticode signature.

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References

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: 8bc7460f-a1c4-5157-8c2d-34d3a6c9c7e9

Tags:FILE

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