YARA · ESET malware-ioc

ESET_Apt_Windows_TA410_X4_Hash_Values

Matches X4 hash function found in TA410 X4

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

Author: ESET Research
Date: 2020-10-09
Modified: 2022-04-27
Score / Quality: 75 / 80

What this rule detects

Matches X4 hash function found in TA410 X4

Targets: Windows PE.

It defines 8 patterns (0 text, 8 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-windows-ta410-x4-hash-values.yarBSD 2-Clause License

rule ESET_Apt_Windows_TA410_X4_Hash_Values : FILE
{
	meta:
		description = "Matches X4 hash function found in TA410 X4"
		author = "ESET Research"
		id = "859bb977-82d0-5314-b1a8-fb3bb06a1b28"
		date = "2020-10-09"
		modified = "2022-04-27"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/ta410/ta410.yar#L127-L149"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "bcf3891ff888ca99af9aa0e239b29241ae819022607fb829c5731267add308ea"
		score = 75
		quality = 80
		tags = "FILE"
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$s1 = {D1 10 76 C2 B6 03}
		$s2 = {71 3E A8 0D}
		$s3 = {DC 78 94 0E}
		$s4 = {40 0D E7 D6 06}
		$s5 = {83 BB FD E8 06}
		$s6 = {92 9D 9B FF EC 03}
		$s7 = {DD 0E FC FA F5 03}
		$s8 = {15 60 1E FB F5 03}

	condition:
		uint16( 0 ) == 0x5a4d and 4 of them
}

Strings (8 patterns)

Identifier	Type	Value
$s1	hex	{D1 10 76 C2 B6 03}
$s2	hex	{71 3E A8 0D}
$s3	hex	{DC 78 94 0E}
$s4	hex	{40 0D E7 D6 06}
$s5	hex	{83 BB FD E8 06}
$s6	hex	{92 9D 9B FF EC 03}
$s7	hex	{DD 0E FC FA F5 03}
$s8	hex	{15 60 1E FB F5 03}

Condition

uint16( 0 ) == 0x5a4d and 4 of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
At least 4 patterns in the rule must match.

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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: 859bb977-82d0-5314-b1a8-fb3bb06a1b28

Metadata

version	1

Tags:FILE

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