ET RETIRED Win32/XFILES Stealer Data Exfiltration Attempt

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED Win32/XFILES Stealer Data Exfiltration Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/?Chatid|3d 40|"; fast_pattern;
    http.content_type;
    content:"multipart/form-data|3b 20|boundary|3d 22|";
    pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}\x22/R";
    http.header_names;
    content:!"Referrer";
    reference:md5,90632a93c8886957f9eeee66489b269e;
    classtype:trojan-activity;
    sid:2041780; rev:2;
    metadata:attack_target Client_and_Server, created_at 2022_12_05, deployment Perimeter, former_category MALWARE, malware_family Win32_XFILES, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_23, reviewed_at 2024_09_23;
)