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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_Winnti_MAL_Dec19_2

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
2025-08-11
Score / Quality
75 / 85

What this rule detects

Detects Winnti malware

Associated malware family: Winnti.

It defines 12 patterns (9 text, 3 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-winnti-mal-dec19-2.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_Winnti_MAL_Dec19_2
{
	meta:
		description = "Detects Winnti malware"
		author = "Unknown"
		id = "77f2cb7d-90a6-5654-9d2e-6b525cd910a2"
		date = "2019-12-06"
		modified = "2025-08-11"
		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#L183-L206"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "216557999b7100f26556f9f7088b16ba125ac39b308cb77c997d620ce9591d24"
		score = 75
		quality = 85
		tags = ""

	strings:
		$a1 = "IPSecMiniPort" wide fullword
		$a2 = "ndis6fw" wide fullword
		$a3 = "TCPIP" wide fullword
		$a4 = "NDIS.SYS" ascii fullword
		$a5 = "ntoskrnl.exe" ascii fullword
		$a6 = "\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}" wide
		$a7 = "\\Device\\Null" wide
		$a8 = "\\Device" wide
		$a9 = "\\Driver" wide
		$b1 = { 66 81 7? ?? 70 17 }
		$b2 = { 81 7? ?? 07 E0 15 00 }
		$b3 = { 8B 46 18 3D 03 60 15 00 }

	condition:
		(6 of ( $a* ) ) and ( 2 of ( $b* ) )
}

Strings (12 patterns)

IdentifierTypeValueModifiers
$a1text"IPSecMiniPort"wide fullword
$a2text"ndis6fw"wide fullword
$a3text"TCPIP"wide fullword
$a4text"NDIS.SYS"ascii fullword
$a5text"ntoskrnl.exe"ascii fullword
$a6text"\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}"wide
$a7text"\\Device\\Null"wide
$a8text"\\Device"wide
$a9text"\\Driver"wide
$b1hex{ 66 81 7? ?? 70 17 }
$b2hex{ 81 7? ?? 07 E0 15 00 }
$b3hex{ 8B 46 18 3D 03 60 15 00 }

Condition

(6 of ( $a* ) ) and ( 2 of ( $b* ) )

In plain words (Heuristic)

  • At least 6 patterns in ( $a* ) must match.
  • At least 2 patterns in ( $b* ) 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: 77f2cb7d-90a6-5654-9d2e-6b525cd910a2

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