Exam SY0-601 topic 1 question 851 discussion

Backdoor because: A: keylogger logs keys and it may use a uncommon port to report its logs, but I dont think its enough evidence to determine thats the case. B: ransomware encrypts files but doesnt connect externally. C: Fileless virus - no cause they downloaded software D: Backdoor - yes, the file downloaded contained a backdoor and its calling 'home'.

The software contained a backdoor.

D. Backdoor

D. A backdoor is a piece of software that enables unauthorized access to a computer system. In this scenario, the fact that external network traffic is connecting to the user's computer on an uncommon port suggests that the software may have included a backdoor, allowing remote access or control of the compromised system by an external attacker.