Malicious Computer Programs

malicious code

malicious program

malware   (related to software)

rogue program

Virus -  a program that "infects" an executable file.  Possible effects:

              - Only displaying a benign message on the monitor

              - Deleting some or all files on the user's hard drive

              - Altering data files.

Two key features of a computer virus:

            - attaches itself to executable files...running executable file may make new copies of virus.

            - virus causes harm only after it has infected an executable file and executable file is run.

Worm - like a virus but is a program that copies itself.

    Distinction between worm/virus - a virus never copies itself – a virus is copied only when the infected executable file is run.
 

Trojan Horse - a deceptively labeled program that contains at least one function that is unknown to the user and that harms the user. 
           

    Possible consequences:
        - may allow a hacker to remotely control the victim's computer

        - may collect passwords and credit card numbers and send them to the hacker

        - may launch denial of service attacks on websites.

    Infiltration techniques:

        - installed on a victim's computer by an intruder without knowledge of the victim

        - downloaded by the user - e-mail attachment

 

Related Links:

cybercrime.gov                Computer Crime Research Center                Computer Security Institute