ET MALWARE SilentGrabber Exfil via Telegram (POST) M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SilentGrabber Exfil via Telegram (POST) M1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/bot"; startswith;
    http.host;
    content:"api.telegram.org"; endswith;
    http.request_body;
    content:"name|3d 22|file|22 3b 20|filename|3d 22|sendDocument|22|";
    content:"name|3d 22|document|22 3b 20|filename|3d 22|Silent|2d|"; fast_pattern;
    content:".rar|0d 0a|"; distance:0;
    content:"|0d 0a 52 61 72|"; distance:0;
    reference:md5,2c6dbadcc4df0a0ee079fc7ba14d07f8;
    classtype:trojan-activity;
    sid:2064048; 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_08_19, deployment Perimeter, deployment SSLDecrypt, malware_family SilentGrabber, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)