SEKOIA_Tool_Chisel_Strings

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
}