Rule History

alert dns $HOME_NET any -> any any (msg:"ET MALWARE BPFDoor CnC Domain in DNS Lookup (ntpupdate .ddnsgeek .com)"; dns.query; bsize:22; content:"ntpupdate.ddnsgeek.com"; nocase; reference:url,rapid7.com/blog/post/tr-new-whitepaper-stealthy-bpfdoor-variants/; classtype:trojan-activity; sid:2069138; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2026_05_04, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_05_04;)