alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Potential FakePAV Checkin"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"/soft-usage/favicon.ico?"; nocase; pcre:"/\?0=.*\&1=.*\&2=.*\&3=.*\&4=.*\&5=.*\&6=.*\&7=.*\&8=/i"; reference:md5,f5dd61e29eff89a93c591fba7ea14d92; classtype:command-and-control; sid:2012405; rev:5; metadata:created_at 2011_03_01, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_06;)