ET MALWARE Win32/Sinresby.B Downloader CnC Activity M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Sinresby.B Downloader CnC Activity M1";
    flow:established,to_server;
    http.request_line;
    content:"POST /?c=Public&a=get_config"; startswith; fast_pattern;
    http.user_agent;
    content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|MSIE|20|9|2e|0|3b 20|Windows|20|NT|20|6|2e|1|29|"; bsize:50;
    http.referer;
    content:"/?c=Public&a=get_config"; endswith;
    reference:md5,8049009d9675d5ac345ce96d1a7c9e67;
    classtype:command-and-control;
    sid:2033792; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_25, deployment Perimeter, malware_family Win32_Sinresby_B, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_25;
)