Skip to content

YARA · SEKOIA.IO Community

SEKOIA_Tool_3Proxy_Strings

Detects 3proxy based on strings

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-03-14
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects 3proxy based on strings

Targets: Windows PE, Linux ELF.

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

tool-3proxy-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_3Proxy_Strings : FILE
{
	meta:
		description = "Detects 3proxy based on strings"
		author = "Sekoia.io"
		id = "daf6cd97-8033-4bfd-88b5-41c06eb417b0"
		date = "2024-03-14"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_3proxy_strings.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "f1d9bea9975af9bfa3f1a8cbf2c1d65fe1d39f303d5dbe6131887653cbbe7021"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "of 3proxy-"
		$ = "-pPORT - service port to accept connections"

	condition:
		( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 500KB and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$text"of 3proxy-"
$text"-pPORT - service port to accept connections"

Condition

( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 500KB 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 500KB (a cheap guard that skips large files).
  • All patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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: daf6cd97-8033-4bfd-88b5-41c06eb417b0

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE