SEKOIA_Tool_Pivotnacci_Webshell

rule SEKOIA_Tool_Pivotnacci_Webshell : FILE
{
	meta:
		description = "Detects pivotnacci webshell"
		author = "Sekoia.io"
		id = "729b6381-b59d-46fe-9ad4-b8b68fb0ceea"
		date = "2024-04-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_pivotnacci_webshell.yar#L1-L23"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "a57792915b4c888547ebe0b08b928e4bc32b3526c98a3ccc9fca0193cedee20a"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "if (cmd == SEND_OPERATION) {"
		$ = "Response.BinaryWrite(newBuff)"
		$ = "Request.Headers.Get(ID_HEADER)"
		$ = "[$READ_BUFFER_SESSION_KEY . $connection_id]"
		$ = "extract_session_readbuf($conn_id"
		$ = "Failed connecting to target $addr:$port : $errstr"
		$ = "void handle_post(String cmd)"
		$ = "SocketChannel socketChannel = this.get_socket(socket_id"
		$ = "this.get_svc().compareTo(this.get_hostname())"

	condition:
		3 of them and filesize < 10KB
}