alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/LockscreenBEI.Scareware Cnc Beacon"; flow:established,to_server; urilen:18; http.method; content:"GET"; http.uri; content:"/reboot/index.html"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:md5,04948b6045730d4ec626f79504c7f9ad; reference:md5,9fff65c23fe403d25c08a5cdd3dc775d; classtype:command-and-control; sid:2018023; rev:4; metadata:attack_target Client_Endpoint, created_at 2014_01_28, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)