alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Agent.WVW CnC Beacon 3"; flow:established,to_server; urilen:4; http.header; content:"Empty|0d 0a|"; http.request_line; content:"GET /cl1"; startswith; fast_pattern; http.referer; content:"1|3a|"; startswith; pcre:"/^\d\.\d_(?:64|32)_\d\x3a/R"; reference:md5,1de834aca8905124e1abcd4f71dea062; classtype:command-and-control; sid:2021259; rev:8; metadata:attack_target Client_Endpoint, created_at 2015_06_12, deployment Perimeter, malware_family Win32_Agent_WVW, signature_severity Major, tag c2, updated_at 2024_04_13, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)