alert dns $HOME_NET any -> any any (msg:"ET MALWARE KHRAT DragonOK DNS Lookup (inter-ctrip .com)"; dns.query; content:"inter-ctrip.com"; depth:15; nocase; endswith; fast_pattern; reference:url,www.forcepoint.com/blog/security-labs/trojanized-adobe-installer-used-install-dragonok%E2%80%99s-new-custom-backdoor; classtype:trojan-activity; sid:2024108; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_03_29, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_09_17;)