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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_POC_Microsoft_Warbird_Loader_Feb26

Detects a POC to turn Microsoft Warbird into a shellcode loader

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
X__Junior
Date
2026-02-03
Modified
2026-05-15
Score / Quality
75 / 85

What this rule detects

Detects a POC to turn Microsoft Warbird into a shellcode loader

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-poc-microsoft-warbird-loader-feb26.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_POC_Microsoft_Warbird_Loader_Feb26 : FILE
{
	meta:
		description = "Detects a POC to turn Microsoft Warbird into a shellcode loader"
		author = "X__Junior"
		id = "a07f6d10-c463-56a6-a667-82b1c00760af"
		date = "2026-02-03"
		modified = "2026-05-15"
		reference = "https://cirosec.de/en/news/abusing-microsoft-warbird-for-shellcode-execution/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/lotusblossom_notepad_exploitation.yar#L75-L88"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "29d0467ee452752286318f350ceb28a2b04ee4c6de550ba0edc34ae0fa7cbb03"
		logic_hash = "daeae01f0d5103974ed011322db3b6a833ee0f67b8739a4e63d6b18704ffa605"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$op = { fe af fe ca ef be ad de }

	condition:
		uint16( 0 ) == 0x5a4d and $op
}

Strings (1 patterns)

IdentifierTypeValueModifiers
$ophex{ fe af fe ca ef be ad de }

Condition

uint16( 0 ) == 0x5a4d and $op

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • Pattern $op must be present.

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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).

  • 29d0467ee452752286318f350ceb28a2b04ee4c6de550ba0edc34ae0fa7cbb03

Licence & attribution

Author: X__Junior

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: a07f6d10-c463-56a6-a667-82b1c00760af

Tags:FILE

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