alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FAKE/ROGUE AV/Security Application Checkin"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"?url="; nocase; content:"&affid="; fast_pattern; nocase; pcre:"/\?url=[0-9]&affid=[0-9]{5}/i"; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows XP)"; depth:46; endswith; nocase; classtype:command-and-control; sid:2009554; rev:8; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_13;)