alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE NUMOZYLOD CnC Checkin M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/|3f|status|3d|start|26|av|3d|"; fast_pattern; startswith; content:"|26|domain|3d|"; within:50; content:"|26|os|3d|Microsoft"; within:50; reference:url,www.googlecloudcommunity.com/gc/Community-Blog/Finding-Malware-Unveiling-NUMOZYLOD-with-Google-Security/ba-p/789551; classtype:trojan-activity; sid:2055339; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_08_19, deployment Perimeter, deployment SSLDecrypt, malware_family NUMOZYLOD, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_19; target:src_ip;)