alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"URLhaus Known malware download URL detected (3757074)"; flow:established,from_client; http.method; content:"GET"; http.uri; content:"/netsyst81.dll"; depth:14; endswith; nocase; http.host; content:"steam66.cn"; depth:10; isdataat:!1,relative; metadata:created_at 2026_01_13; reference:url, urlhaus.abuse.ch/url/3757074/; classtype:trojan-activity; sid:84620174; rev:1;)