ET RETIRED Win32/S1deload Stealer CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED Win32/S1deload Stealer CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/commonupdate?version="; startswith; fast_pattern;
    pcre:"/^(?:[A-F0-9]{4}-){7}[A-F0-9]{4}/R";
    content:"&uuid="; distance:0;
    pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}/R";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:22;
    reference:url,www.bitdefender.com/files/News/CaseStudies/study/428/Bitdefender-PR-Whitepaper-S1deloadStealer-creat6669-en-EN.pdf;
    classtype:trojan-activity;
    sid:2044359; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_27, deployment Perimeter, former_category MALWARE, malware_family Win32_S1deload, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_30, reviewed_at 2024_09_30;
)