alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE VaultCrypt Checkin"; flow:established,to_server; urilen:6; http.method; content:"GET"; http.uri; content:"/v.vlt"; fast_pattern; http.header_names; to_lowercase; content:"|0d 0a|ua-cpu|0d 0a|"; reference:md5,d8bd77eebee2e74ea74679bf3f1f7210; classtype:command-and-control; sid:2021091; rev:6; metadata:created_at 2015_05_13, signature_severity Major, updated_at 2024_04_28;)