YARA · ESET malware-ioc

ESET_Apt_Windows_TA410_Rootkit_Strings

Strings found in TA410's Rootkit

APT / threat actorESET 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

Strings found in TA410's Rootkit

Targets: Windows PE.

It defines 12 patterns (12 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

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

rule ESET_Apt_Windows_TA410_Rootkit_Strings : FILE
{
	meta:
		description = "Strings found in TA410's Rootkit"
		author = "ESET Research"
		id = "a6a97721-571e-5414-9b00-5789d7bcd078"
		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#L671-L697"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "1d3ad63508c5e4bca32b9a44b738cb4a7384ccfa5704ce329260adb342ea4e60"
		score = 75
		quality = 80
		tags = "FILE"
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$driver1 = "\\Driver\\kbdclass" wide
		$driver2 = "\\Driver\\mouclass" wide
		$device1 = "\\Device\\KeyboardClass0" wide
		$device2 = "\\Device\\PointerClass0" wide
		$driver3 = "\\Driver\\tcpip" wide
		$device3 = "\\Device\\tcp" wide
		$driver4 = "\\Driver\\nsiproxy" wide
		$device4 = "\\Device\\Nsi" wide
		$reg1 = "\\Registry\\Machine\\SYSTEM\\Setup\\AllowStart\\ceipCommon" wide
		$reg2 = "RHH%d" wide
		$reg3 = "RHP%d" wide
		$s1 = "\\SystemRoot\\System32\\drivers\\hidmouse.sys" wide

	condition:
		uint16( 0 ) == 0x5a4d and all of ( $s1 , $reg* ) and ( all of ( $driver* ) or all of ( $device* ) )
}

Strings (12 patterns)

Identifier	Type	Value	Modifiers
$driver1	text	"\\Driver\\kbdclass"	wide
$driver2	text	"\\Driver\\mouclass"	wide
$device1	text	"\\Device\\KeyboardClass0"	wide
$device2	text	"\\Device\\PointerClass0"	wide
$driver3	text	"\\Driver\\tcpip"	wide
$device3	text	"\\Device\\tcp"	wide
$driver4	text	"\\Driver\\nsiproxy"	wide
$device4	text	"\\Device\\Nsi"	wide
$reg1	text	"\\Registry\\Machine\\SYSTEM\\Setup\\AllowStart\\ceipCommon"	wide
$reg2	text	"RHH%d"	wide
$reg3	text	"RHP%d"	wide
$s1	text	"\\SystemRoot\\System32\\drivers\\hidmouse.sys"	wide

Condition

uint16( 0 ) == 0x5a4d and all of ( $s1 , $reg* ) and ( all of ( $driver* ) or all of ( $device* ) )

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
All patterns in ( $s1 , $reg* ) must match.
All patterns in ( $driver* ) must match.
All patterns in ( $device* ) 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: a6a97721-571e-5414-9b00-5789d7bcd078

Metadata

version	1

Tags:FILE

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