YARA · ESET malware-ioc

ESET_Apt_Windows_TA410_Tendyron_Downloader

TA410 Tendyron Downloader

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

Author: ESET Research
Date: 2020-12-09
Modified: 2022-04-27
Score / Quality: 75 / 80

What this rule detects

TA410 Tendyron Downloader

It defines 2 patterns (1 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-windows-ta410-tendyron-downloader.yarBSD 2-Clause License

rule ESET_Apt_Windows_TA410_Tendyron_Downloader
{
	meta:
		description = "TA410 Tendyron Downloader"
		author = "ESET Research"
		id = "afd8a2a7-8d58-5a96-b9e0-6f8b859e83c5"
		date = "2020-12-09"
		modified = "2022-04-27"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/ta410/ta410.yar#L75-L107"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "16030a78ae9af8783f5913644294ceff861c8264ead8ca99435032be6d7949ef"
		score = 75
		quality = 80
		tags = ""
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$chunk_1 = {
            8A 10
            80 F2 5C
            80 C2 5C
            88 10
            40
            83 E9 01
            75 ??
        }
		$s1 = "startModule" fullword

	condition:
		int16 ( 0 ) == 0x5A4D and all of them
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$chunk_1	hex	{ 8A 10 80 F2 5C 80 C2 5C 88 10 40 83 E9 01 75 ?? }
$s1	text	"startModule"	fullword

Condition

int16 ( 0 ) == 0x5A4D and all of them

In plain words (Heuristic)

All 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: afd8a2a7-8d58-5a96-b9e0-6f8b859e83c5

Metadata

version	1

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