ET MALWARE BlankGrabber New Victim Checkin/Exfil (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE BlankGrabber New Victim Checkin/Exfil (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.host; bsize:16;
    content:"api.telegram.org";
    http.request_body;
    content:"|3c|b|3e|Blank|20|Grabber|3c 2f|b|3e 20|got|20|a|20|new|20|victim|3a 20 3c|b|3e|"; fast_pattern;
    content:"|3c|b|3e|Grabbed|20|Info|3c 2f|b|3e|"; distance:0;
    classtype:command-and-control;
    sid:2061560; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_04_14, deployment Perimeter, deployment SSLDecrypt, malware_family BlankGrabber, confidence High, signature_severity Major, tag c2, updated_at 2025_04_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)