[Emerging-Sigs] SIG: ET SCAN Mascan User Agent Detected

Kevin Ross kevross33 at googlemail.com
Fri Sep 12 04:25:26 EDT 2014

Saw this in real use. Might still be tied to research project though.Other
interesting characteristic is lack of Host header.

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET SCAN Mascan
User Agent Detected"; flow:established,to_server; content:"User-Agent|3A|
masscan/"; http_header; fast_pattern:only; classtype:attempted-recon;
reference:url,github.com/robertdavidgraham/masscan; sid:198331; rev:1;)

Kind Regards,
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