A combination of firewalls and anti-virus software should be used to protect networks against Trojans.
New Trojans are released on a frequent basis. For example, on March 3, 2005, security experts at McAfee and SophosLabs issued alerts of a new Trojan virus called Troj/BagleD1-L. This Trojan tries to prevent various security applications (such as anti-virus and firewall software) from working by renaming files belonging to security applications so that they can no longer load. It then attempts to block access to a range of security-related Websites by altering the Windows HOSTS file. The virus is said to arrive on email messages having a ZIP attachment. After it is opened, the ZIP attachment includes a program file named “doc—01.exe” or “prs—03.exe” or some other name. If the program inside the ZIP attachment is opened, the Troj/BagleD1-L attempts to connect to one of many Websites to download more code.
See Also: Anti-Virus Software; Denial of Service (DoS); Firewall; Internet; Network; Trojan.
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