YARA · SEKOIA.IO Community

SEKOIA_Apt_Apt29_Wineloader_Malicious_Pdf

Detects malicious PDF used by APT29 to drop Wineloader

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X

Author: Sekoia.io
Date: 2024-03-25
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects malicious PDF used by APT29 to drop Wineloader

Targets: PDF.

It defines 4 patterns (3 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-apt29-wineloader-malicious-pdf.yarDetection Rule License 1.1

rule SEKOIA_Apt_Apt29_Wineloader_Malicious_Pdf : FILE
{
	meta:
		description = "Detects malicious PDF used by APT29 to drop Wineloader"
		author = "Sekoia.io"
		id = "b1db731e-471e-493a-b76c-38d2808ccac9"
		date = "2024-03-25"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_apt29_wineloader_malicious_pdf.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "9712217ff3597468b48cdf45da588005de3a725ba554789bb7e5ae1b0f7c02a7"
		hash = "3739b2eae11c8367b576869b68d502b97676fb68d18cc0045f661fbe354afcb9"
		logic_hash = "784f5ab2602e2185e8253b5b8d9a084ede0604457b0a0674fceffbcb226e3ba1"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "<</Type/Annot/Subtype/Link/Border[0 0 0]/Rect["
		$s2 = "/A<</Type/Action/S/URI/URI("
		$s3 = { 2f [2-10] 2e 70 68 70 29 3e 3e }
		$s4 = "JamrulNormal"

	condition:
		uint32be( 0 ) == 0x25504446 and $s2 in ( @s1 .. @s3 ) and $s4
}

Strings (4 patterns)

Identifier	Type	Value
$s1	text	"<</Type/Annot/Subtype/Link/Border[0 0 0]/Rect["
$s2	text	"/A<</Type/Action/S/URI/URI("
$s3	hex	{ 2f [2-10] 2e 70 68 70 29 3e 3e }
$s4	text	"JamrulNormal"

Condition

uint32be( 0 ) == 0x25504446 and $s2 in ( @s1 .. @s3 ) and $s4

In plain words (Heuristic)

The file must start with “%PDF”.
Pattern $s2 must be found within the range @s1 .. @s3.
Pattern $s4 must be present.

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References

https://github.com/SEKOIA-IO/Community

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

9712217ff3597468b48cdf45da588005de3a725ba554789bb7e5ae1b0f7c02a7
3739b2eae11c8367b576869b68d502b97676fb68d18cc0045f661fbe354afcb9

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

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: b1db731e-471e-493a-b76c-38d2808ccac9

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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