alert dns $HOME_NET any -> any any (msg:"ET MALWARE Observed DNS Query to APT36 Domain (hcidoc .in)"; dns.query; dotprefix; content:".hcidoc.in"; nocase; endswith; reference:url,github.com/bitdefender/malware-ioc/blob/master/2026_03_05-apt36-iocs.csv; classtype:trojan-activity; sid:2068039; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_03_06, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, tag APT36, updated_at 2026_03_06;)