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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_Fake_Document_Software_Indicators_Nov23

Detects indicators of fake document/image utility software that acts as a downloader for additional malware

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Jonathan Peters
Date
2023-11-13
Modified
2024-04-24
Score / Quality
80 / 85

What this rule detects

Detects indicators of fake document/image utility software that acts as a downloader for additional malware

Targets: Windows PE.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-fake-document-software-indicators-nov23.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_Fake_Document_Software_Indicators_Nov23 : FILE
{
	meta:
		description = "Detects indicators of fake document/image utility software that acts as a downloader for additional malware"
		author = "Jonathan Peters"
		id = "231474cd-1ec9-5738-bf48-ef707689056d"
		date = "2023-11-13"
		modified = "2024-04-24"
		reference = "https://nochlab.blogspot.com/2023/09/net-in-javascript-fake-pdf-converter.html"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/mal_fake_document_software.yar#L1-L20"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "ac5356ae011effb9d401bf428c92a48cf82c9b61f4c24a29a9718e3379f90f1d"
		hash = "d1c29c2243c511ca3264ad568a6be62f374e104b903eca93debce6691e1c5007"
		logic_hash = "5f0a088bf672559fbac90313768d41b79be7f1f56c6ddb36f0dcd265a07f98b2"
		score = 80
		quality = 85
		tags = "FILE"

	strings:
		$ = "tweakscode.com" wide
		$ = "www.createmygif.com" wide
		$ = "www.videownload.com" wide
		$ = "www.pdfconverterz.com" wide
		$ = "www.pdfconvertercompare.com" wide

	condition:
		uint16( 0 ) == 0x5a4d and 1 of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$text"tweakscode.com"wide
$text"www.createmygif.com"wide
$text"www.videownload.com"wide
$text"www.pdfconverterz.com"wide
$text"www.pdfconvertercompare.com"wide

Condition

uint16( 0 ) == 0x5a4d and 1 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 1 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).

  • ac5356ae011effb9d401bf428c92a48cf82c9b61f4c24a29a9718e3379f90f1d
  • d1c29c2243c511ca3264ad568a6be62f374e104b903eca93debce6691e1c5007

Licence & attribution

Author: Jonathan Peters

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: 231474cd-1ec9-5738-bf48-ef707689056d

Tags:FILE