alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Wacapew.C!ml CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?cname="; startswith; fast_pattern; http.user_agent; content:"Go-http-client"; startswith; http.header_names; content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; reference:md5,7f939b3ba32224827485168077881948; classtype:command-and-control; sid:2037777; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_15, deployment Perimeter, malware_family Win32_Wacapew_C_ml, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_15, reviewed_at 2024_12_24;)