ET RETIRED Blister Loader Cobalt Strike C2 Profile M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED Blister Loader Cobalt Strike C2 Profile M1";
    flow:established,to_server;
    http.method;
    pcre:"/^(GE|POS)T$/";
    http.uri;
    content:"/safebrowsing/3Tqo/"; startswith; fast_pattern;
    http.host;
    content:!"safebrowsing.googleapis.com";
    content:!"sb.google.com";
    content:!"www.google.com";
    reference:url,blog.fox-it.com/2023/11/01/popping-blisters-for-research-an-overview-of-past-payloads-and-exploring-recent-developments/;
    classtype:trojan-activity;
    sid:2049975; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_01_10, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_10_03, reviewed_at 2024_10_03;
    target:src_ip;
)