alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Riberow.A (fsize)"; flow:to_server,established; http.uri; content:"/fsize.php?name="; content:"/WF-update.log"; reference:md5,c55fe941b80b3e5e77be8728642d138e; classtype:trojan-activity; sid:2013670; rev:3; metadata:created_at 2011_09_19, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_20;)