YARA · SEKOIA.IO Community

SEKOIA_Apt_Ta428_Tmanger_Strings

Detects Tmanger malware

APT / threat actorTmangerSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X

Author: Sekoia.io
Date: 2022-09-06
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects Tmanger malware

Associated malware family: Tmanger.

Targets: Windows PE.

It defines 10 patterns (10 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-ta428-tmanger-strings.yarDetection Rule License 1.1

rule SEKOIA_Apt_Ta428_Tmanger_Strings : FILE
{
	meta:
		description = "Detects Tmanger malware"
		author = "Sekoia.io"
		id = "f600404d-3f93-4e3f-bba7-9f519f67c6cb"
		date = "2022-09-06"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_ta428_tmanger_strings.yar#L1-L26"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "e045f38367fa7f3cdcc908e60de4386889c7878c95b1a40f63fd70683699b0f1"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "sock_hmutex" wide ascii
		$ = "cmd_hmutex" wide ascii
		$ = "%s_%d.bmp" wide ascii
		$ = "WSAStartup Error!" wide ascii
		$ = "4551-8f84-08e738aec" wide ascii
		$ = "Init failed!" wide ascii
		$ = "GetLanIP error!" wide ascii
		$ = "chcp & exit" wide ascii
		$ = "GetHostname error!" wide ascii
		$ = "[Num Lock]" wide ascii

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 200KB and 4 of them
}

Strings (10 patterns)

Identifier	Type	Value	Modifiers
$	text	"sock_hmutex"	wide ascii
$	text	"cmd_hmutex"	wide ascii
$	text	"%s_%d.bmp"	wide ascii
$	text	"WSAStartup Error!"	wide ascii
$	text	"4551-8f84-08e738aec"	wide ascii
$	text	"Init failed!"	wide ascii
$	text	"GetLanIP error!"	wide ascii
$	text	"chcp & exit"	wide ascii
$	text	"GetHostname error!"	wide ascii
$	text	"[Num Lock]"	wide ascii

Condition

uint16be( 0 ) == 0x4d5a and filesize < 200KB and 4 of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
The file must be smaller than 200KB (a cheap guard that skips large files).
At least 4 patterns in the rule must match.

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References

https://github.com/SEKOIA-IO/Community

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: f600404d-3f93-4e3f-bba7-9f519f67c6cb

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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