ET MALWARE Win32/TA402 Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/TA402 Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.host;
    content:".requestinspector.com"; endswith;
    http.request_body;
    content:"LS0tLS0tLS0gC"; fast_pattern;
    pcre:"/^[a-zA-Z0-9\+\/]{1,200}(?:KQogLS0tLS0tIApWZXJzaW9uOi|kKIC0tLS0tLSAKVmVyc2lvbjog|pCiAtLS0tLS0gClZlcnNpb246I)/R"; distance:0;
    classtype:trojan-activity;
    sid:2049158; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2023_10_19, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_TA402, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_13, former_sid 2855435;
    target:src_ip;
)