Which technique is used for performing dynamic analysis in a testbed for malware?

Dynamic analysis refers to the examination of a program while it is in execution, particularly useful in the context of malware analysis. A sandbox provides a controlled environment where suspicious files can be run without risk of causing harm to the host system. It allows a researcher to observe the behavior of the malware, including its effects on system resources, network activity, and interactions with other programs.

In a sandbox, the analyst can monitor all actions taken by the malware in real-time, enabling them to capture the malware's true characteristics and functionality. This process is essential for understanding the potential threats posed by the malware and how it might exploit vulnerabilities in the system.

Other techniques such as decompilation, static analysis, and patch analysis have different objectives. Decompilation and static analysis focus on examining the code without executing it, which doesn’t reveal behavior, while patch analysis seeks to identify changes made to a file or system, typically inspecting how a specific malware variant alters existing software. These methods do not provide the comprehensive view of malware behavior that dynamic analysis in a sandbox offers.