ET MALWARE Win32/VB.AAF Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/VB.AAF Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/troep/mon/mon.php?n="; startswith; fast_pattern;
    content:"&u="; distance:0;
    content:"&v="; distance:0;
    content:"&a="; distance:0;
    content:"&i="; distance:0;
    http.user_agent;
    content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|Win32|3b 20|WinHttp|2e|WinHttpRequest|2e|5|29|";
    threshold:type limit, track by_src, seconds 180, count 1;
    reference:md5,15df8f4bd6fbd26558fe210031d281ec;
    classtype:trojan-activity;
    sid:2044368; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_27, deployment Perimeter, malware_family Win32_VB_AAF, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_27;
)