YARA · SEKOIA.IO Community

SEKOIA_Apt_Emissarypanda_Sysupdate_Removing_Tool

Detects the SysUpdate removing tool

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

Author: Sekoia.io
Date: 2022-08-03
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects the SysUpdate removing tool

Targets: Windows PE.

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-emissarypanda-sysupdate-removing-tool.yarDetection Rule License 1.1

rule SEKOIA_Apt_Emissarypanda_Sysupdate_Removing_Tool : FILE
{
	meta:
		description = "Detects the SysUpdate removing tool"
		author = "Sekoia.io"
		id = "711d059c-6229-49ef-aa20-a04d505838dc"
		date = "2022-08-03"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_emissarypanda_sysupdate_removing_tool.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "6a23fac99f26f4b0f9099e435ad53d9e83bf1322d190c565abf0c06dceeeaf34"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "KsWAYYYXXsFUCK" wide
		$ = "remove Services:%s %d" wide
		$ = "remove dir:%s %d" wide
		$ = "remove reg %d" wide

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 11MB and 2 of them
}

Strings (4 patterns)

Identifier	Type	Value	Modifiers
$	text	"KsWAYYYXXsFUCK"	wide
$	text	"remove Services:%s %d"	wide
$	text	"remove dir:%s %d"	wide
$	text	"remove reg %d"	wide

Condition

uint16be( 0 ) == 0x4d5a and filesize < 11MB and 2 of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
The file must be smaller than 11MB (a cheap guard that skips large files).
At least 2 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: 711d059c-6229-49ef-aa20-a04d505838dc

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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