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SEKOIA_Rat_Win_Romcom_Payload

Detect the RomCom malware

MalwareRomcomSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X (with warnings)
Author
Sekoia.io
Date
2022-11-04
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detect the RomCom malware

Associated malware family: Romcom.

Targets: Windows PE.

It has no patterns: the condition alone decides (modules, file properties or other rules). YARA modules used: pe, hash.

YARA-X says: warning[deprecated_field]: field `number_of_resources` is deprecated

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

rat-win-romcom-payload.yarDetection Rule License 1.1
import "pe"
import "hash"

rule SEKOIA_Rat_Win_Romcom_Payload
{
	meta:
		description = "Detect the RomCom malware"
		author = "Sekoia.io"
		id = "c391f84c-f0cb-42d8-a8d8-d59725bf74c2"
		date = "2022-11-04"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/rat_win_romcom_payload.yar#L4-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "56f016df8e9165522e18f34bdb7c3044ee8927f53dd6818fa2b3d6424191d8e0"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	condition:
		for any i in ( 0 .. pe.number_of_resources -1 ) : ( hash.sha256 ( pe.resources [ i ] . offset , pe.resources [ i ] . length ) == "160ed1cdf6e9321cef19cfed6a63b4b5557dd35e174b821bf8a81c4146fa6536" )
}

Condition

for any i in ( 0 .. pe.number_of_resources -1 ) : ( hash.sha256 ( pe.resources [ i ] . offset , pe.resources [ i ] . length ) == "160ed1cdf6e9321cef19cfed6a63b4b5557dd35e174b821bf8a81c4146fa6536" )

In plain words (Heuristic)

  • A for-loop checks a property over several matches or items.
  • Uses the pe module.
  • Uses the hash module.
  • Compares a hash of the file or a part of it.

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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: c391f84c-f0cb-42d8-a8d8-d59725bf74c2

Metadata

version1.0
classificationTLP:CLEAR

Related rules

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