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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_Winnti_MAL_Dec19_1

Detects Winnti malware

APT / threat actorWinntiSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Unknown
Date
2019-12-06
Modified
2025-06-03
Score / Quality
75 / 85

What this rule detects

Detects Winnti malware

Associated malware family: Winnti.

Targets: Windows PE.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-winnti-mal-dec19-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_Winnti_MAL_Dec19_1 : FILE
{
	meta:
		description = "Detects Winnti malware"
		author = "Unknown"
		id = "322e9362-bfb6-55e3-9a93-d54246311d11"
		date = "2019-12-06"
		modified = "2025-06-03"
		reference = "https://www.verfassungsschutz.de/download/broschuere-2019-12-bfv-cyber-brief-2019-01.pdf"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_winnti.yar#L160-L181"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "2ffeb40b096e5112adbb9c07b27b954424d6ef11a0a9bd736b43df9aa1e9af3e"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$e1 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411015}" ascii nocase
		$e2 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411014}" ascii nocase
		$e3 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411016}" ascii nocase
		$e4 = "\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}" wide
		$e5 = "BFE_Notify_Event_{7D00FA3C-FBDC-4A8D-AEEB-3F55A4890D2A}" nocase
		$fp1 = "also increase possible memory usage of THOR."

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 3000KB and 1 of ( $e* ) and not 1 of ( $fp* )
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$e1text"Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411015}"ascii nocase
$e2text"Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411014}"ascii nocase
$e3text"Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411016}"ascii nocase
$e4text"\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}"wide
$e5text"BFE_Notify_Event_{7D00FA3C-FBDC-4A8D-AEEB-3F55A4890D2A}"nocase
$fp1text"also increase possible memory usage of THOR."

Condition

uint16( 0 ) == 0x5a4d and filesize < 3000KB and 1 of ( $e* ) and not 1 of ( $fp* )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 3000KB (a cheap guard that skips large files).
  • At least 1 patterns in ( $e* ) must match.
  • At least 1 patterns in ( $fp* ) must match.

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References

Licence & attribution

Author: Unknown

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: 322e9362-bfb6-55e3-9a93-d54246311d11

Tags:FILE

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