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YARA · SEKOIA.IO Community

SEKOIA_Tool_Rsockstun_Strings

Detects Rsockstun based on strings

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-12-22
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects Rsockstun based on strings

Targets: Windows PE, Linux ELF.

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

Summary generated from the rule's metadata and condition.

Rule source

tool-rsockstun-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_Rsockstun_Strings : FILE
{
	meta:
		description = "Detects Rsockstun based on strings"
		author = "Sekoia.io"
		id = "94d8cb39-3421-441c-8404-62a591b86912"
		date = "2023-12-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_rsockstun_strings.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "8faf1004ec56728f1e451734ed651e8f77a49faf7f232df82e0b4950a9f1d198"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "main.connectviaproxy"
		$ = "main.connectForSocks"
		$ = "main.listenForClients"
		$ = "main.listenForSocks"

	condition:
		( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 10MB and all of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$text"main.connectviaproxy"
$text"main.connectForSocks"
$text"main.listenForClients"
$text"main.listenForSocks"

Condition

( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 10MB and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must start with the ELF header — a Linux/Unix executable.
  • The file must be smaller than 10MB (a cheap guard that skips large files).
  • All patterns in the rule must match.

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References

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: 94d8cb39-3421-441c-8404-62a591b86912

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE