Based on the output received while investigating alerts from the SIEM, which attack is being executed?

The correct choice indicates that the attack being executed is password spraying. This technique involves attempting to access a large number of accounts with a few commonly used passwords, as opposed to targeting a single account with many different passwords, which is seen in brute-force attacks.

Identifying an attack as password spraying typically arises from SIEM alerts that show a pattern of multiple failed login attempts across various accounts within a certain timeframe. This pattern suggests a targeted approach aimed at exploiting weak or commonly used passwords rather than exhaustive attempts against a single account.

In the context of the other options, credential harvesting usually involves collecting user credentials through phishing or other deceptive methods. Keyloggers capture keystrokes to obtain credentials, which is different from the scenario presented. Brute-force attacks often result in numerous failed login attempts against a single user account, which is not characteristic of the broader approach associated with password spraying.