alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.VBKrypt.vquj Checkin"; flow:established,to_server; http.method; content:"POST"; nocase; http.uri; content:".php"; http.header; header_lowercase; content:"|0d 0a|content-encoding|3a 20|binary|0d 0a|"; fast_pattern; http.request_body; content:"|03 00|"; startswith; content:"|00 01 00|"; within:4; content:"|00 01 00|"; within:4; reference:md5,0c420e1eef4b1f097ffec8d0c0ff438a; classtype:command-and-control; sid:2021605; rev:8; metadata:created_at 2015_08_10, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_02;)