ET MALWARE Patchwork Backdoor Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Patchwork Backdoor Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:13;
    content:"/cnc/register"; fast_pattern;
    http.request_body;
    content:"|7b 22|host_identifier|22 3a 22|"; startswith;
    content:"|22 7d|"; distance:36; within:2; endswith;
    reference:url,app.any.run/tasks/d6f9aecc-42be-4703-aadd-572ed1f4573f/;
    reference:url,twitter.com/JAMESWT_MHT/status/1225014535591026688;
    classtype:command-and-control;
    sid:2029395; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_06, deployment Perimeter, deployment SSLDecrypt, malware_family Backdoor, performance_impact Low, confidence High, signature_severity Major, tag Patchwork, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_06;
)