alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Linux/Denonia DNS Request Over HTTPS (denonia .xyz) M2"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:37; content:"/dns-query?name=gw.denonia.xyz&type=A"; endswith; fast_pattern; http.host; content:"cloudflare-dns.com"; http.user_agent; content:"GoKit XHTTP Client"; startswith; http.accept; content:"application/dns-json"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:"|0d 0a|x-http-gokit-requestid|0d 0a|"; reference:url,cadosecurity.com/cado-discovers-denonia-the-first-malware-specifically-targeting-lambda; classtype:trojan-activity; sid:2035886; rev:4; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2022_04_11, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30, reviewed_at 2024_10_08;)