alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Socks5Systemz CnC Checkin M2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"c=94bf3661c7"; fast_pattern; flowbits:set,ET.Socks5Systemz.Checkin; reference:url,bitsight.com/blog/unveiling-socks5systemz-rise-new-proxy-service-privateloader-and-amadey; classtype:trojan-activity; sid:2049115; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, created_at 2023_11_07, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_11_27, reviewed_at 2025_07_14;)