alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Koobface Trojan HTTP Post Checkin"; flow:established,to_server; http.method; content:"POST"; nocase; http.request_body; content:"f=0&a="; content:"&v="; content:"&c="; content:"&s="; content:"&l=&ck="; content:"&c_fb="; classtype:command-and-control; sid:2008864; rev:8; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_21;)