YARA · ESET malware-ioc

ESET_Apt_Windows_TA410_Lookback_Strings

Matches multiple strings and export names in TA410 LookBack.

APT / threat actorLookbackESET malware-iocBSD 2-Clause LicenseCompiles with YARA-X

Author: ESET Research
Date: 2021-10-12
Modified: 2022-04-27
Score / Quality: 75 / 80

What this rule detects

Matches multiple strings and export names in TA410 LookBack.

Associated malware family: Lookback.

Targets: Windows PE.

It defines 6 patterns (6 text, 0 hex, 0 regex). YARA modules used: pe.

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

apt-windows-ta410-lookback-strings.yarBSD 2-Clause License

import "pe"

rule ESET_Apt_Windows_TA410_Lookback_Strings : FILE
{
	meta:
		description = "Matches multiple strings and export names in TA410 LookBack."
		author = "ESET Research"
		id = "b693c468-5abf-579d-bc03-67f67339feb9"
		date = "2021-10-12"
		modified = "2022-04-27"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/ta410/ta410.yar#L311-L331"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "d17ed604e3691c20fe489f95197b7b802ec951ed13d538fa6643449485b326b2"
		score = 75
		quality = 80
		tags = "FILE"
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$s1 = "SodomMainFree" ascii wide
		$s2 = "SodomMainInit" ascii wide
		$s3 = "SodomNormal.bin" ascii wide
		$s4 = "SodomHttp.bin" ascii wide
		$s5 = "sodom.ini" ascii wide
		$s6 = "SodomMainProc" ascii wide

	condition:
		uint16( 0 ) == 0x5a4d and ( 2 of them or pe.exports ( "SodomBodyLoad" ) or pe.exports ( "SodomBodyLoadTest" ) )
}

Strings (6 patterns)

Identifier	Type	Value	Modifiers
$s1	text	"SodomMainFree"	ascii wide
$s2	text	"SodomMainInit"	ascii wide
$s3	text	"SodomNormal.bin"	ascii wide
$s4	text	"SodomHttp.bin"	ascii wide
$s5	text	"sodom.ini"	ascii wide
$s6	text	"SodomMainProc"	ascii wide

Condition

uint16( 0 ) == 0x5a4d and ( 2 of them or pe.exports ( "SodomBodyLoad" ) or pe.exports ( "SodomBodyLoadTest" ) )

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
At least 2 patterns in the rule must match.
Uses the pe module.
Checks exported functions or the DLL name.

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References

https://github.com/eset/malware-ioc/

Licence & attribution

Author: ESET Research

Source repository: ESET malware-ioc @ 17baf44964

Licence: BSD 2-Clause License (stated in the rule's own meta)

“BSD 2-Clause”

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: b693c468-5abf-579d-bc03-67f67339feb9

Metadata

version	1

Tags:FILE

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