You mind this virus, i guess

Generally, viruses are written to exploit issues found in existing software. This can be as simply as taking advantage of a text field that doesn't check for overflows properly, or more detailed, specific, and technical such as software that looks at semi-random IP addresses and checks to see if it can access any systems.

A lot of time, virus writers watch for security notices from major companies to see what features have been recently fixed or patched. They then write software/viruses to take advantage of these holes in machines that have not yet been updated. It is for this reason you should keep your system up to date with updates and virus software.

Please note that specifics on coding such viruses is a topic that should not be discussed on this forum; however, the thought process, theory, and other higher-level discussions are okay.

Brad!