ET MALWARE OilRig OopsIE CnC Checkin M4

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE OilRig OopsIE CnC Checkin M4";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/khc?"; depth:5; fast_pattern;
    pcre:"/^[A-F0-9]{10,}$/Ri";
    http.accept_enc;
    content:"gzip, deflate"; endswith;
    http.header_names;
    content:"User-Agent";
    content:!"Referer";
    reference:url,researchcenter.paloaltonetworks.com/2018/09/unit42-oilrig-targets-middle-eastern-government-adds-evasion-techniques-oopsie/;
    classtype:command-and-control;
    sid:2026083; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2018_09_05, deployment Perimeter, malware_family OilRig, malware_family OopsIE, performance_impact Low, confidence High, signature_severity Major, tag APT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16;
)