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-- -*- mode: lua -*-
-- vim: set filetype=lua :

description = [[
Detects whether a host is infected with the Stuxnet worm (http://en.wikipedia.org/wiki/Stuxnet).

An executable version of the Stuxnet infection will be downloaded if a format
for the filename is given on the command line.
]]

---
-- @usage
-- nmap --script stuxnet-detect -p 445 <host>
--
-- @args stuxnet-detect.save Path to save Stuxnet executable under, with
--       <code>%h/code> replaced by the host's IP address, and <code>%v</code>
--       replaced by the version of Stuxnet.
--
-- @output
-- PORT    STATE SERVICE      REASON
-- 445/tcp open  microsoft-ds syn-ack
--
-- Host script results:
-- |_stuxnet-detect: INFECTED (version 4c:04:00:00:01:00:00:00)

author = "Mak Kolybabi"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "intrusive"}

require("msrpc")
require("smb")
require("stdnse")

local STUXNET_PATHS = {"\\\\browser", "\\\\ntsvcs", "\\\\pipe\\browser", "\\\\pipe\\ntsvcs"}
local STUXNET_UUID = string.char(0xe1, 0x04, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46)
local STUXNET_VERSION = 0x01

local RPC_GET_VERSION = 0x00
local RPC_GET_EXECUTABLE = 0x04

local function check_infected(host, path, save)
	local file, result, session, status, version

	-- Create an SMB session.
	status, session = msrpc.start_smb(host, path)
	if not status then
		stdnse.print_debug(1, "Failed to establish session on %s.", path)
		return false, nil
	end

	-- Bind to the Stuxnet service.
	status, result = msrpc.bind(session, STUXNET_UUID, STUXNET_VERSION, nil)
	if not status or result["ack_result"] ~= 0 then
		stdnse.print_debug(1, "Failed to bind to Stuxnet service.")
		msrpc.stop_smb(session)
		return false, nil
	end

	-- Request version of Stuxnet infection.
	status, result = msrpc.call_function(session, RPC_GET_VERSION, "")
	if not status then
		stdnse.print_debug(1, "Failed to retrieve Stuxnet version: %s", result)
		msrpc.stop_smb(session)
		return false, nil
	end
	version = stdnse.tohex(result.arguments, {separator = ":"})

	-- Request executable of Stuxnet infection.
	if save then
		local file, fmt

		status, result = msrpc.call_function(session, RPC_GET_EXECUTABLE, "")
		if not status then
			stdnse.print_debug(1, "Failed to retrieve Stuxnet executable: %s", result)
			msrpc.stop_smb(session)
			return true, version
		end

		fmt = save:gsub("%%h", host.ip)
		fmt = fmt:gsub("%%v", version)
		file = io.open(fmt, "w")
		if file then
			stdnse.print_debug(1, "Wrote %d bytes to file %s.", #result.arguments, fmt)
			file:write(result.arguments)
			file:close()
		else
			stdnse.print_debug(1, "Failed to open file: %s", fmt)
		end
	end

	-- Destroy the SMB session
	msrpc.stop_smb(session)

	return true, version
end

hostrule = function(host)
	return (smb.get_port(host) ~= nil)
end

action = function(host, port)
	local _, path, result, save, status

	-- Get script arguments.
	save = stdnse.get_script_args("stuxnet-detect.save")

	-- Try to find Stuxnet on this host.
	for _, path in pairs(STUXNET_PATHS) do
		status, result = check_infected(host, path, save)
		if status then
			return "INFECTED (version " .. result .. ")"
		end
	end
end

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