alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Riberow.A (postit3)"; flow:to_server,established; http.method; content:"POST"; nocase; http.uri; content:"/postit3.php"; http.content_type; content:"multipart/form-data|3b 20|boundary="; startswith; reference:md5,c55fe941b80b3e5e77be8728642d138e; classtype:trojan-activity; sid:2013672; rev:4; metadata:created_at 2011_09_19, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_21;)