ET MALWARE Ursnif Variant CnC Beacon - URI Struct M1 (_2B)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Ursnif Variant CnC Beacon - URI Struct M1 (_2B)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:>150;
    content:"_2B";
    content:"_2B"; fast_pattern; distance:0;
    content:!"&";
    content:!"?";
    content:!"=";
    content:!"/tr/v1/"; startswith;
    http.host; dotprefix;
    content:!".surveymonkey.com";
    content:!".cisco.com";
    content:!".trendmicro.com";
    http.connection;
    content:"Keep-Alive";
    http.user_agent;
    content:!"TMUFE";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    classtype:command-and-control;
    sid:2033203; rev:7;
    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_03_10;
)