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YARA · SEKOIA.IO Community

SEKOIA_Apt_Reaper_Malicious_Lnk

No description has been set in the source file - SEKOIA

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-09-12
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

No description has been set in the source file - SEKOIA

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-reaper-malicious-lnk.yarDetection Rule License 1.1
rule SEKOIA_Apt_Reaper_Malicious_Lnk : FILE
{
	meta:
		description = "No description has been set in the source file - SEKOIA"
		author = "Sekoia.io"
		id = "8f055d1b-5727-4d77-9671-cdbb1ea69d5f"
		date = "2023-09-12"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_reaper_malicious_lnk.yar#L1-L15"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "8cec5819dd7b01b3993acae056f5640fa28ffe76b05d2d9e59779a73eb00bd6e"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "*rshell.exe" wide
		$ = "/od') do call" wide

	condition:
		uint32be( 0 ) == 0x4c000000 and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$text"*rshell.exe"wide
$text"/od') do call"wide

Condition

uint32be( 0 ) == 0x4c000000 and all of them

In plain words (Heuristic)

  • The file must start with the Windows shortcut (LNK) header.
  • All patterns in the rule must match.

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References

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: 8f055d1b-5727-4d77-9671-cdbb1ea69d5f

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE