alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Vilsel.ayjv Checkin (aid)"; flow:established,to_server; http.uri; content:"?aid="; fast_pattern; content:"&si="; content:"&rd="; pcre:"/&si=\d+&si=\d+&rd=20\d{11}/"; classtype:command-and-control; sid:2013122; rev:6; metadata:created_at 2011_06_29, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_16;)