YARA · SEKOIA.IO Community

SEKOIA_Apt_Malware_Pocoproxy

Detects strings in PocoProxy

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

Author: Sekoia.io
Date: 2024-08-13
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detects strings in PocoProxy

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-malware-pocoproxy.yarDetection Rule License 1.1

rule SEKOIA_Apt_Malware_Pocoproxy : FILE
{
	meta:
		description = "Detects strings in PocoProxy"
		author = "Sekoia.io"
		id = "8b37e37f-339e-4f8b-b792-435096f56af0"
		date = "2024-08-13"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_malware_pocoproxy.yar#L1-L25"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "2b89f15012512002c656ff821bbbeca0"
		hash = "8d850fed6bb1f3b60365ed656c6791c5"
		logic_hash = "217f4eabb5ff4534878b6dd192ae446e651d8510f03ceb501eb33e91199c15a8"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "-listen" ascii fullword
		$ = "-connect" ascii fullword
		$ = "-proxy" ascii fullword
		$ = "%d-%d-%d %d:%d:%d" ascii fullword
		$ = "%S://%S:%u%S" wide
		$ = "\\r\\n[%u(%u/%u/%u/%u)]==> %S  %S>> %S:%d connect ok." wide
		$ = "\\r\\nnconnect to %S:%d faild." wide
		$ = "\\r\\nI'm listen %S:%d,welcome..." wide

	condition:
		uint16be( 0 ) == 0x4d5a and 5 of them
}

Strings (8 patterns)

Identifier	Type	Value	Modifiers
$	text	"-listen"	ascii fullword
$	text	"-connect"	ascii fullword
$	text	"-proxy"	ascii fullword
$	text	"%d-%d-%d %d:%d:%d"	ascii fullword
$	text	"%S://%S:%u%S"	wide
$	text	"\\r\\n[%u(%u/%u/%u/%u)]==> %S %S>> %S:%d connect ok."	wide
$	text	"\\r\\nnconnect to %S:%d faild."	wide
$	text	"\\r\\nI'm listen %S:%d,welcome..."	wide

Condition

uint16be( 0 ) == 0x4d5a and 5 of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
At least 5 patterns in the rule must match.

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References

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

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

2b89f15012512002c656ff821bbbeca0
8d850fed6bb1f3b60365ed656c6791c5

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: 8b37e37f-339e-4f8b-b792-435096f56af0

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

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