ET MALWARE Win32/DarkWatchman Checkin Activity (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/DarkWatchman Checkin Activity (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.header_names;
    content:"X-Client-Id|0d 0a|";
    content:"X-Client-Controller|0d 0a|"; fast_pattern;
    content:"X-Client-Ut|0d 0a|";
    http.request_body;
    content:"os="; startswith;
    content:"&cn="; distance:0;
    content:"&un="; distance:0;
    content:"&b="; distance:0;
    content:"&l="; distance:0;
    content:"av="; distance:0;
    reference:url,prevailion.com/darkwatchman-new-fileness-techniques/;
    reference:md5,2ccc9637823753de9cdcdf76a1d22725;
    classtype:trojan-activity;
    sid:2034745; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_16, deployment Perimeter, malware_family Win32_DarkWatchman, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_14, reviewed_at 2024_06_26;
)