alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT Possible CVE-2013-3906 CnC Checkin"; flow:established,to_server; content:"POST"; http_method; content:".php"; http_uri; content:"MyWebClient"; depth:11; http_user_agent; reference:url,alienvault.com/open-threat-exchange/blog/microsoft-office-zeroday-used-to-attack-pakistani-targets; classtype:command-and-control; sid:2017671; rev:6; metadata:created_at 2013_11_06, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2019_08_15;)