alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.VBKrypt.vquj Checkin"; flow:to_server,established; http.method; content:"POST"; nocase; http.uri; content:".php"; http.header; content:"|0d 0a|Content-Encoding|3a 20|binary|0d 0a|"; fast_pattern; http.request_body; content:"|03 00|"; depth:2; content:"|00 01 00|"; within:4; content:"|00 01 00|"; within:4; reference:md5,0c420e1eef4b1f097ffec8d0c0ff438a; classtype:command-and-control; sid:2021605; rev:5; metadata:created_at 2015_08_10, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_29;)