ET MALWARE Win32/Qakbot CnC Activity (POST)

alert http $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Win32/Qakbot CnC Activity (POST)";
    flow:to_server,established;
    urilen:3;
    http.method;
    content:"POST";
    http.uri;
    content:"/t5";
    http.user_agent;
    content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|WOW64|3b 20|Trident|2f|7|2e|0|3b 20|Touch|3b 20|rv|3a|11|2e|0|29 20|like|20|Gecko"; bsize:76;
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.header_names;
    content:!"Referer";
    http.accept;
    content:"application|2f|x|2d|shockwave|2d|flash|2c 20|image|2f|gif|2c 20|image|2f|jpeg|2c 20|image|2f|pjpeg|2c 20 2a 2f 2a|"; bsize:70; fast_pattern;
    reference:url,blog.eclecticiq.com/qakbot-malware-used-unpatched-vulnerability-to-bypass-windows-os-security-feature;
    classtype:trojan-activity;
    sid:2043333; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_18, deployment Perimeter, malware_family Win32_Qakbot, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_18, reviewed_at 2025_10_24;
)