alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"URLhaus Known malware download URL detected (3898148)"; flow:established,from_client; http.method; content:"GET"; http.uri; content:"/fxrgbtj/gxcjtky/zkeibpn/stego_4ehpd80tsq.png"; depth:45; endswith; nocase; http.host; content:"www.knockknock.top"; depth:18; isdataat:!1,relative; metadata:created_at 2026_08_06; reference:url, urlhaus.abuse.ch/url/3898148/; classtype:trojan-activity; sid:84761248; rev:1;)