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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_6

Detects VEILEDSIGNAL malware

APT / threat actorVeiledsignalSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Mandiant
Date
2023-04-20
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects VEILEDSIGNAL malware

Associated malware family: Veiledsignal.

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-nk-mal-m-hunting-veiledsignal-6.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_6 : FILE
{
	meta:
		description = "Detects VEILEDSIGNAL malware"
		author = "Mandiant"
		id = "2cbedbc0-d465-5674-bf9c-9362003eb8d2"
		date = "2023-04-20"
		modified = "2023-12-05"
		reference = "https://www.mandiant.com/resources/blog/3cx-software-supply-chain-compromise"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_nk_tradingtech_apr23.yar#L145-L164"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "00a43d64f9b5187a1e1f922b99b09b77"
		logic_hash = "d3b1e5f7a6b73fc4cdc5abe19a412130cde33c2d52c0ad78256b865e018e3794"
		score = 75
		quality = 85
		tags = "FILE"
		disclaimer = "This rule is meant for hunting and is not tested to run in a production environment"

	strings:
		$ss1 = "C:\\Programdata\\" wide
		$ss2 = "devobj.dll" wide fullword
		$ss3 = "msvcr100.dll" wide fullword
		$ss4 = "TpmVscMgrSvr.exe" wide fullword
		$ss5 = "\\Microsoft\\Windows\\TPM" wide fullword
		$ss6 = "CreateFileW" ascii fullword

	condition:
		( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) and all of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$ss1text"C:\\Programdata\\"wide
$ss2text"devobj.dll"wide fullword
$ss3text"msvcr100.dll"wide fullword
$ss4text"TpmVscMgrSvr.exe"wide fullword
$ss5text"\\Microsoft\\Windows\\TPM"wide fullword
$ss6text"CreateFileW"ascii fullword

Condition

( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in the rule must match.

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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).

  • 00a43d64f9b5187a1e1f922b99b09b77

Licence & attribution

Author: Mandiant

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: 2cbedbc0-d465-5674-bf9c-9362003eb8d2

Metadata

disclaimerThis rule is meant for hunting and is not tested to run in a production environment

Tags:FILE

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