ET MALWARE Ursnif Variant CnC Beacon - URI Struct M2 (_2F)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Ursnif Variant CnC Beacon - URI Struct M2 (_2F)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:>150;
    content:"_2F"; fast_pattern;
    content:"_2F"; distance:0;
    content:"_2F"; distance:0;
    content:!"&";
    content:!"?";
    content:!"=";
    content:!"/tr/v1/"; startswith;
    http.host; dotprefix;
    content:!".surveymonkey.com"; endswith;
    content:!"cisco.com"; endswith;
    http.connection;
    content:"Keep-Alive";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    classtype:command-and-control;
    sid:2033204; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_29, deployment Perimeter, malware_family ursnif, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2023_06_12;
)