alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ZAccess/Sirefef/MAX++/Jorik/Smadow Checkin"; flow:established,to_server; http.uri; content:"/stat"; content:".php?w="; content:"&i=00000000000"; fast_pattern; content:"&a="; http.user_agent; content:"Opera/6 (Windows NT 5.1|3b 20|"; classtype:command-and-control; sid:2013907; rev:5; metadata:created_at 2011_11_11, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_18;)