Determination of whether the computer has become a zombie is not easy. Some symptoms may be:
- increased hard disk activity
- excessive use of network link
- some of the typical functions of the system is not available (eg, task manager)
- e-mails from unknown people.
To safeguard against attacks, we must first have a working and current antivirus program, and do not open files from unknown sources (eg, suspicious e-mails).
