ET RETIRED Win32/S1deload Stealer CnC Checkin - Get Tasking

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED Win32/S1deload Stealer CnC Checkin - Get Tasking";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/api/task/update?id="; startswith; fast_pattern;
    http.header_names;
    content:"|0d 0a|Host|0d 0a 0d 0a|"; bsize:10;
    reference:url,www.bitdefender.com/files/News/CaseStudies/study/428/Bitdefender-PR-Whitepaper-S1deloadStealer-creat6669-en-EN.pdf;
    classtype:trojan-activity;
    sid:2044360; 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;
)