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SEKOIA_Tool_Chisel_Strings

Detects Chisel

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 Chisel

Targets: Windows PE, Linux ELF.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
tool-chisel-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_Chisel_Strings : FILE
{
	meta:
		description = "Detects Chisel"
		author = "Sekoia.io"
		id = "667a8aa3-772b-45f1-8c89-acb7b976888d"
		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_chisel_strings.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "fe389d9d0ae73c79f1040274e21135d4df645c5ac672fc824923f0a5a085be8a"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "tunnel.(*Tunnel).handleSSHChannel."
		$ = "server.(*Server).handleWebsocket"
		$ = "tunnel.(*udpHandler)"
		$ = "server.(*Server).tlsLetsEncrypt"
		$ = "cnet.(*wsConn).SetPingHandler.(*Conn)"
		$ = "tunnel.(*udpConns).dial."

	condition:
		( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 15MB and 3 of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$text"tunnel.(*Tunnel).handleSSHChannel."
$text"server.(*Server).handleWebsocket"
$text"tunnel.(*udpHandler)"
$text"server.(*Server).tlsLetsEncrypt"
$text"cnet.(*wsConn).SetPingHandler.(*Conn)"
$text"tunnel.(*udpConns).dial."

Condition

( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 15MB and 3 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 15MB (a cheap guard that skips large files).
  • At least 3 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: 667a8aa3-772b-45f1-8c89-acb7b976888d

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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