alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Pincav.cjvb Checkin"; flow:established,to_server; http.method; content:"POST"; nocase; http.user_agent; content:"Asynchronous WinHTTP"; fast_pattern; startswith; http.request_body; content:"CyoK"; depth:4; content:"CyoK"; distance:0; reference:md5,1e5499640ca31e4b1f113b97a0cae08b; classtype:command-and-control; sid:2015753; rev:5; metadata:created_at 2012_10_01, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_13;)