ET MALWARE MaskGramStealer Common Victim C2 Response (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MaskGramStealer Common Victim C2 Response (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent; bsize:10;
    content:"Client/1.0"; fast_pattern;
    http.content_type;
    content:"application/x-www-form-urlencoded";
    http.request_body; bsize:<17;
    pcre:"/^(?:ftpclients|wallets|mailclients|svit|telegram|discord)\x3d(?:nepco|true|false)$/";
    reference:md5,25041e230c55fd46e5ef52ab02b3bc6c;
    classtype:command-and-control;
    sid:2066663; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_09, deployment Perimeter, deployment SSLDecrypt, malware_family MaskGramStealer, signature_severity Critical, updated_at 2026_01_09;
    target:src_ip;
)