alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bifrose/Cycbot Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?sv="; fast_pattern; content:"&tq="; pcre:"/(?:1|2)\.(?:p(?:hp|ng)|jpe?g|cgi|gif)\?sv=\d{2,3}&tq=/i"; http.user_agent; content:"chrome/9.0"; startswith; classtype:command-and-control; sid:2013795; rev:12; metadata:created_at 2011_10_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)