Antimalware: To keep all hosts safe from malware, there are a number of actions you should take at minimum:
Install Antivirus Software: Access Control, Authentication, and Authorization, Should be installed and definitions kept current on all hosts.
Antivirus software should run on the server as well as on every workstation.
In addition to active monitoring of incoming files, scans should be conducted regularly to catch any infections that have slipped through.
Installed Antispam Filters: Although exact numbers are hard to acquire, it is clear that a great deal of email traffic is spam.
Spam filters are needed to keep the majority of this unwanted email from reaching the users.
Install Antispyware Software: Some antispyware software is combined with antivirus packages, whereas other programs are available as standalone.
Regardless of the type you use, you must regularly look for spyware, often identified by the presence of tracking cookies on hosts, and remove those that get installed.
Use Pop-up Blockers: Not only are pop-ups irritating, but they are also security threats. Pop-ups (including pop-unders) represent unwanted programs running on the system, and they can jeopardize the system’s well being.
Use Host-Based Firewalls: A Firewall is the first line of defense against attackers and malware. Almost every current operating system includes a firewall, and most are turned on by default.
Use Host-Based IDSs: IDSs are also available for individual hosts. In fact, the standard way SNORT (www.snort.org) installs is as host-based IDS.
Usually, you will come across host-based IDS on critical servers, but they can be installed on any machine.