When network administrators observe an increased amount of web traffic without an increased number of financial transactions, the company is MOST likely experiencing which of the following attacks?

A security incident has been created after noticing unusual behavior from a Windows domain controller.
The server administrator has discovered that a user logged in to the server with elevated permissions, but the user's account does not follow the standard corporate naming scheme. There are also several other accounts in the administrators group that do not follow this naming scheme. Which of the following is the possible cause for this behavior and the BEST remediation step?

A threat intelligence analyst who works for a financial services firm received this report:
"There has been an effective waterhole campaign residing at www.bankfinancecompsoftware.com. This domain is delivering ransomware. This ransomware variant has been called "LockMaster" by researchers due to its ability to overwrite the MBR, but this term is not a malware signature. Please execute a defensive operation regarding this attack vector." The analyst ran a query and has assessed that this traffic has been seen on the network. Which of the following actions should the analyst do NEXT? (Select TWO).

A cybersecurity analyst has received the laptop of a user who recently left the company. The analyst types
'history' into the prompt, and sees this line of code in the latest bash history:

This concerns the analyst because this subnet should not be known to users within the company. Which of the following describes what this code has done on the network?

A cybersecurity analyst has received an alert that well-known "call home" messages are continuously observed by network sensors at the network boundary. The proxy firewall successfully drops the messages. After determining the alert was a true positive, which of the following represents the MOST likely cause?