alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bifrose/Cycbot Checkin 2"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/\x2E(p(hp|ng)|jpe?g|cgi|gif)\x3F(v\d{1,2}|pr)\x3D/"; http.user_agent; content:"chrome/9.0"; reference:md5,8c4f90bb59c05269c6c6990ec434eab6; classtype:command-and-control; sid:2014163; rev:11; metadata:created_at 2012_01_28, signature_severity Major, updated_at 2020_09_10;)