alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Troj.Cidox Checkin"; flow:established,to_server; http.uri; content:".php?sign="; fast_pattern; content:"&key="; content:"&av="; content:"&os="; content:"&vm="; content:"&digital="; reference:md5,0ce7f9dde5c273d7e71c9f1301fe505d; classtype:command-and-control; sid:2017349; rev:5; metadata:created_at 2013_05_14, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_19;)