alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lyposit Ransomware Checkin 1"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"/ad"; depth:3; pcre:"/^\/ad[^\x2f]*?\/\?[a-z]{1,5}\x3d\x2e?[a-z0-9]+?$/i"; http.user_agent; content:"Microsoft BITS/"; depth:15; classtype:command-and-control; sid:2015957; rev:8; metadata:attack_target Client_Endpoint, created_at 2012_11_29, deployment Perimeter, signature_severity Major, tag Ransomware, updated_at 2020_04_24, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)