ET HUNTING Suspicious Windows Executable WriteProcessMemory

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Suspicious Windows Executable WriteProcessMemory";
    flow:established,to_client;
    http.response_body;
    content:"MZ"; startswith;
    byte_jump:4,58,relative,little;
    content:"PE|00 00|"; distance:-64; within:4;
    content:"WriteProcessMemory"; nocase;
    reference:url,sans.org/reading_room/whitepapers/malicious/rss/_33649;
    reference:url,jessekornblum.livejournal.com/284641.html;
    reference:url,msdn.microsoft.com/en-us/library/windows/desktop/ms681674%28v=vs.85%29.aspx;
    classtype:misc-activity;
    sid:2015588; rev:6;
    metadata:created_at 2012_08_08, confidence Medium, signature_severity Informational, updated_at 2023_02_14;
)