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DNS Covert Channel Research
DNS-Based Covert Channel Heartbeat Detector
Deep Node, Inc. - Detecting a Covert Channel
Find Covert Backchannels and DNS Tunneling
EM Covert Channel Attack Setup and Explanation
Presentation: NetWarden Mitigating Network Covert Channels While Preserving Performance
Covert Command and Control over DNS with Beacon
Covert Channels (CISSP Free by Skillset.com)
Large Scale DNS Research
Real world examples of malware using DNS for exfiltration and C&C channels
Covert Channels
Black Hat USA 2010: PSUDP: A Passive Approach to Network-Wide Covert Communication 1/4