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1.5 Malicious Code
Malicious code is program code
specifically written for a malicious purpose (rather than code written
for a legitimate purpose, which a cracker figured out how to misuse).
For example, you would call a piece of code malicious if it deliberately
did something like:
- Delete files on your disk, or reformat your disk,
without the users knowledge
- Report the contents of your email address book
to a web server collecting email addresses for a spammer
- Display Ha ha, youve been rooted!
and other such messages on your computer
- Replace certain system files with other files,
causing programs to malfunction
- Capture your network password and email it to
This section discusses some different
types of malicious code you may encounter out in the field when administering
or managing security for a network. Each type of code discussed below
differs mainly in how it gets propagated from one user (or system) to
another, and how it gets activated to do its dirty deed(s) once it gets
onto a system, rather than in the functionality the destructive program
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CertiGuide for Security+ (http://www.CertiGuide.com/secplus/) on CertiGuide.com
Version 1.0 - Version Date: November 15, 2004
Adapted with permission from a work created by Tcat Houser et al.
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