The function of a malware sandbox in cybersecurity is to create a controlled environment where suspicious software can be safely executed and analyzed without risking harm to the broader system. This isolation allows cybersecurity professionals to observe the behavior of potential malware, detect malicious activities, and identify threats before they can inflict damage. By studying how malware interacts with the system, organizations can develop better defenses, improve detection mechanisms, and enhance overall cybersecurity strategies to protect against future attacks.