ET MALWARE Netbounce Program Wrapper Download

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Netbounce Program Wrapper Download";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.user_agent;
    content:"Go-http-client/1.1"; bsize:18;
    http.uri;
    content:"/progwrapper.exe"; bsize:16; fast_pattern;
    http.header_names;
    content:!"Referer";
    content:!"Connect";
    reference:url,www.fortinet.com/blog/threat-research/netbounce-threat-actor-tries-bold-approach-to-evade-detection;
    reference:md5,1b4b013948c9af0260409ce7cb7d107b;
    classtype:trojan-activity;
    sid:2032226; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_03_19, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_19;
)