alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"URLhaus Known malware download URL detected (3835271)"; flow:established,from_client; http.method; content:"GET"; http.uri; content:"/sys_cache_drv.sys"; depth:18; endswith; nocase; http.host; content:"31.57.97.20"; depth:11; isdataat:!1,relative; metadata:created_at 2026_04_30; reference:url, urlhaus.abuse.ch/url/3835271/; classtype:trojan-activity; sid:84698371; rev:1;)