### Comment:
What are some common signs that indicate a system may be infected with malware?

### REPLY:
One common sign of a malware infection is the presence of a keylogger, which is a type of malware that records keystrokes. This allows the attacker to capture sensitive information, such as passwords and credit card details, without the user's knowledge. To check if a system is infected with a keylogger, one can analyze network traffic, monitor system processes, or use specialized tools to detect any suspicious activity.