ET MALWARE DarkCloud Stealer Key Logger Function Exfiltrating Data via Telegram

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE DarkCloud Stealer Key Logger Function Exfiltrating Data via Telegram";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/bot"; startswith;
    content:"/sendDocument?chat_id="; distance:0;
    content:"&caption="; distance:0;
    content:"DC-KL|3a 3a 3a|"; distance:0; fast_pattern;
    http.host;
    content:"api.telegram.org"; bsize:16;
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|document|22 3b 20|filename|3d 22|KeyData";
    reference:md5,1475ae99116f934716ec683954fe29fd;
    classtype:trojan-activity;
    sid:2045300; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_02, deployment Perimeter, deployment SSLDecrypt, malware_family DarkCloud, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_02, reviewed_at 2025_07_14;
    target:src_ip;
)