ET MALWARE Arkei/Vidar/Mars Stealer Variant Data Exfiltration Attempt

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Arkei/Vidar/Mars Stealer Variant Data Exfiltration Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/winsock"; fast_pattern; bsize:8;
    http.header_names;
    content:!"Referer";
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|fname|22|";
    content:"PK|03 04|"; distance:0;
    byte_test:1,<=,20,0,relative;
    content:"ProcList.txt"; distance:0;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|hwid|22 0d 0a 0d 0a|";
    pcre:"/\{[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}\}/R";
    reference:md5,844ab1b8a2db0242a20a6f3bbceedf6b;
    classtype:trojan-activity;
    sid:2038525; rev:1;
    metadata:created_at 2022_08_15, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_15, reviewed_at 2025_07_14;
)