ET MALWARE ServHelper CnC Command (Whoami)

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE ServHelper CnC Command (Whoami)";
    flow:from_server,established;
    http.stat_code;
    content:"200";
    file.data;
    content:"shell^whoami"; depth:12; fast_pattern;
    reference:md5,8efa9d3c901234f24659a8ea9c3fee14;
    reference:url,www.cybereason.com/blog/threat-actor-ta505-targets-financial-enterprises-using-lolbins-and-a-new-backdoor-malware;
    classtype:command-and-control;
    sid:2027303; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_01, deployment Perimeter, confidence High, signature_severity Major, tag ServHelper, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_28;
)