YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_VULN_PUA_GIGABYTE_Driver_Jul22_1

Detects a vulnerable GIGABYTE driver sometimes used by malicious actors to escalate privileges

Potentially unwantedSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X

Author: Florian Roth (Nextron Systems)
Date: 2022-07-25
Modified: 2023-12-05
Score / Quality: 65 / 85

What this rule detects

Detects a vulnerable GIGABYTE driver sometimes used by malicious actors to escalate privileges

It defines 4 patterns (3 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

vuln-pua-gigabyte-driver-jul22-1.yarDetection Rule License 1.1

rule SIGNATURE_BASE_VULN_PUA_GIGABYTE_Driver_Jul22_1 : FILE
{
	meta:
		description = "Detects a vulnerable GIGABYTE driver sometimes used by malicious actors to escalate privileges"
		author = "Florian Roth (Nextron Systems)"
		id = "c66b858f-a034-53e1-b0fd-e48693fc6913"
		date = "2022-07-25"
		modified = "2023-12-05"
		reference = "https://twitter.com/malmoeb/status/1551449425842786306"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/vuln_gigabyte_driver.yar#L2-L28"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "31f4cfb4c71da44120752721103a16512444c13c2ac2d857a7e6f13cb679b427"
		logic_hash = "8aeae559b52b8e01ceab8caba24653b949b3bec694a14b36c819b0a7c9f8b7c6"
		score = 65
		quality = 85
		tags = "FILE"

	strings:
		$xc1 = { 00 46 00 69 00 6C 00 65 00 56 00 65 00 72 00 73
               00 69 00 6F 00 6E 00 00 00 00 00 35 00 2E 00 32
               00 2E 00 33 00 37 00 39 00 30 00 2E 00 31 00 38
               00 33 00 30 00 20 00 62 00 75 00 69 00 6C 00 74
               00 20 00 62 00 79 00 3A 00 20 00 57 00 69 00 6E
               00 44 00 44 00 4B 00 00 00 00 00 32 00 09 00 01
               00 49 00 6E 00 74 00 65 00 72 00 6E 00 61 00 6C
               00 4E 00 61 00 6D 00 65 00 00 00 67 00 64 00 72
               00 76 00 2E 00 73 00 79 00 73 }
		$x1 = "AEYAaQBsAGUAVgBlAHIAcwBpAG8AbgAAAAAANQAuADIALgAzADcAOQAwAC4AMQA4ADMAMAAgAGIAdQBpAGwAdAAgAGIAeQA6ACAAVwBpAG4ARABEAEsAAAAAADIACQABAEkAbgB0AGUAcgBuAGEAbABOAGEAbQBlAAAAZwBkAHIAdgAuAHMAeQBz"
		$x2 = "BGAGkAbABlAFYAZQByAHMAaQBvAG4AAAAAADUALgAyAC4AMwA3ADkAMAAuADEAOAAzADAAIABiAHUAaQBsAHQAIABiAHkAOgAgAFcAaQBuAEQARABLAAAAAAAyAAkAAQBJAG4AdABlAHIAbgBhAGwATgBhAG0AZQAAAGcAZAByAHYALgBzAHkAc"
		$x3 = "ARgBpAGwAZQBWAGUAcgBzAGkAbwBuAAAAAAA1AC4AMgAuADMANwA5ADAALgAxADgAMwAwACAAYgB1AGkAbAB0ACAAYgB5ADoAIABXAGkAbgBEAEQASwAAAAAAMgAJAAEASQBuAHQAZQByAG4AYQBsAE4AYQBtAGUAAABnAGQAcgB2AC4AcwB5AH"

	condition:
		filesize < 4000KB and 1 of them
}

Strings (4 patterns)

Identifier	Type	Value
$xc1	hex	{ 00 46 00 69 00 6C 00 65 00 56 00 65 00 72 00 73 00 69 00 6F 00 6E 00 00 00 00 00 35 00 2E 00 32 00 2E 00 33 00 37 00 39 00 30 00 …
$x1	text	"AEYAaQBsAGUAVgBlAHIAcwBpAG8AbgAAAAAANQAuADIALgAzADcAOQAwAC4AMQA4ADMAMAAgAGIAdQBpAGwAdAAgAGIAeQA6ACAAVwBpAG4ARABEAEsAAAAAADIACQABAEkAbgB0AGUAcgBuAGEAbABOAGEAbQB …
$x2	text	"BGAGkAbABlAFYAZQByAHMAaQBvAG4AAAAAADUALgAyAC4AMwA3ADkAMAAuADEAOAAzADAAIABiAHUAaQBsAHQAIABiAHkAOgAgAFcAaQBuAEQARABLAAAAAAAyAAkAAQBJAG4AdABlAHIAbgBhAGwATgBhAG0AZ …
$x3	text	"ARgBpAGwAZQBWAGUAcgBzAGkAbwBuAAAAAAA1AC4AMgAuADMANwA5ADAALgAxADgAMwAwACAAYgB1AGkAbAB0ACAAYgB5ADoAIABXAGkAbgBEAEQASwAAAAAAMgAJAAEASQBuAHQAZQByAG4AYQBsAE4AYQBtAG …

Condition

filesize < 4000KB and 1 of them

In plain words (Heuristic)

The file must be smaller than 4000KB (a cheap guard that skips large files).
At least 1 patterns in the rule must match.

Test this rule in your browser

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References

https://twitter.com/malmoeb/status/1551449425842786306

Sample hashes

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

31f4cfb4c71da44120752721103a16512444c13c2ac2d857a7e6f13cb679b427

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: c66b858f-a034-53e1-b0fd-e48693fc6913

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