description = [[
Checks if SMTP is running on a non-standard port.
This may indicate that crackers or script kiddies have set up a backdoor on the
system to send spam or control the machine.
]]
---
-- @output
-- 22/tcp open smtp
-- |_ smtp-strangeport: Mail server on unusual port: possible malware
author = "Diman Todorov"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"malware", "safe"}
portrule = function(host, port)
return port.service == "smtp" and
port.number ~= 25 and port.number ~= 465 and port.number ~= 587
and port.protocol == "tcp"
and port.state == "open"
end
action = function()
return "Mail server on unusual port: possible malware"
end
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