### Comment:
What are some common indicators of a malware infection on a computer system?

### REPLY:
One indicator of a malware infection is the presence of a rootkit, which is a type of malware that can hide itself and other malicious activities from detection. Rootkits can modify system files, inject malicious code into running processes, and intercept system calls to conceal their presence. Another indication is the presence of a keylogger, which can record keystrokes and capture sensitive information such as passwords and credit card details.