ET MALWARE Possible OwlProxy activity M5

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible OwlProxy activity M5";
    flow:established,to_server;
    http.uri;
    content:"/px/s?pa="; fast_pattern;
    reference:url,unit42.paloaltonetworks.com/rare-possible-gelsemium-attack-targets-se-asia;
    reference:url,www.telsy.com/microsoft-exchange-servers-backdoored-with-owlproxy-fuscom-dll;
    reference:url,lab52.io/blog/chimera-apt-updates-on-its-owlproxy-malware;
    classtype:trojan-activity;
    sid:2048239; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2023_09_25, deployment Perimeter, deployment Internal, deployment SSLDecrypt, malware_family OwlProxy, performance_impact Low, confidence Low, signature_severity Major, updated_at 2023_09_25, reviewed_at 2023_09_25;
    target:dest_ip;
)