| Malicious code includes viruses, worms, Trojan horses, and spyware. The code provides the ability for a malicious user to read from and write to files and folders on a computer's hard drive. It also has the ability to run and attach programs, which provides a high risk potential for the distribution of malicious mobile code. Much of this code is not detected by antivirus software or even host intrusion detection systems. Once it has residency within the network, unauthorized users are able to breach firewalls and access sensitive data by assuming the identity of authorized users. Real-time scans must be performed on files from external sources as they are downloaded and prior to being opened or executed. This requirement is applicable to network device management and is not applicable to the routing function. |
