Which of the following is NOT a sign of potential malicious activity in a system?

Regular software updates are a fundamental aspect of maintaining a secure and functional computer system. They are designed to patch vulnerabilities, improve performance, and enhance features, all of which contribute to the overall health and security of a system. By regularly updating software, users can protect their systems from known threats and reduce the likelihood of exploitation by malicious actors.

In contrast, unexplained credentials, data exfiltration attempts, and excessive intranet browsing are all indicators of potential malicious activity. Unexplained credentials could signify unauthorized access or compromised accounts, while data exfiltration attempts indicate an effort to transfer sensitive information out of the system, which is often indicative of a breach. Excessive browsing of intranet resources might suggest reconnaissance activities by intruders who are trying to map out the internal network.

Thus, regular software updates do not reflect malicious activity but instead signify proactive measures taken to safeguard the system.