Test callback functionality
Callbacks are malware communications seeking instructions. An adversary will test their malware to ensure the appropriate instructions are conveyed and the callback software can be reached. 
Tactic: Test Capabilities
DetectionDetectable by Common Defenses (Yes/No/Partial): No
Explanation: Adversary controls the test and defender likely has no visibility.
Difficulty for the AdversaryEasy for the Adversary (Yes/No): Yes
Explanation: Adversary controls or acquires all pieces of infrastructure and can test outside of defender's visibility.
- Tony Lee. (2012, December 11). Testing Your Defenses - Beaconing. Retrieved March 9, 2017.