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82 lines
2.8 KiB
Lua
82 lines
2.8 KiB
Lua
local http = require "http"
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local nmap = require "nmap"
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local shortport = require "shortport"
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local stdnse = require "stdnse"
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local string = require "string"
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local table = require "table"
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description = [[
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Looks for signature of known server compromises.
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Currently, the only signature it looks for is the one discussed here:
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http://blog.unmaskparasites.com/2009/09/11/dynamic-dns-and-botnet-of-zombie-web-servers/.
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This is done by requesting the page <code>/ts/in.cgi?open2</code> and
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looking for an errant 302 (it attempts to detect servers that always
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return 302). Thanks to Denis from the above link for finding this
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technique!
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]]
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---
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--@output
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-- Interesting ports on www.sopharma.bg (84.242.167.49):
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-- PORT STATE SERVICE REASON
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-- 80/tcp open http syn-ack
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-- |_ http-malware-host: Host appears to be clean
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-- 8080/tcp open http-proxy syn-ack
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-- | http-malware-host:
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-- | Host appears to be infected (/ts/in.cgi?open2 redirects to http://last-another-life.ru:8080/index.php)
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-- |_ See: http://blog.unmaskparasites.com/2009/09/11/dynamic-dns-and-botnet-of-zombie-web-servers/
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--
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author = "Ron Bowes"
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license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
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categories = {"malware", "safe"}
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portrule = shortport.http
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action = function(host, port)
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-- Check what response we get for a 404
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local result, result_404, known_404 = http.identify_404(host, port)
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if(result == false) then
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return stdnse.format_output(false, "Couldn't identify 404 message: " .. result_404)
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end
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-- If the 404 result is a 302, we're going to have trouble
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if(result_404 == 302) then
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return stdnse.format_output(false, "Unknown pages return a 302 response; unable to check")
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end
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-- Identify servers that answer 200 to invalid HTTP requests and exit as these would invalidate the test
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if ( result_404 == 200 ) then
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stdnse.debug1("Exiting due to ambiguous response from web server on %s:%s. All URIs return status 200.", host.ip, port.number)
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return false
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end
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-- Perform a GET request on the file
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result = http.get(host, port, "/ts/in.cgi?open2")
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if(not(result)) then
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return stdnse.format_output(false, "Couldn't perform GET request")
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end
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if(result.status == 302) then
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local response = {}
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if(result.header.location) then
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table.insert(response, string.format("Host appears to be infected (/ts/in.cgi?open2 redirects to %s)", result.header.location))
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else
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table.insert(response, "Host appears to be infected (/ts/in.cgi?open2 return a redirect")
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end
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table.insert(response, "See: http://blog.unmaskparasites.com/2009/09/11/dynamic-dns-and-botnet-of-zombie-web-servers/")
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return stdnse.format_output(true, response)
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end
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-- Not infected
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if(nmap.verbosity() > 0) then
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return "Host appears to be clean"
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else
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return nil
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end
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end
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