Changes

==Process of transmission==

==Process of transmission==

#Automatic replication: When an infected program is run, the virus also runs, searching the host computer for other programs to infect.  

 

#By email: viruses (and other kinds of malware) are often transmitted as email attachments. In some cases, scripts within a message can also be used to infect a device, if the E-mail client program is not configured to ignore scripts.  

#Automatic replication. When an infected program is run, the virus also runs, searching the host computer for other programs to infect.  

#Misleading software: A "[[Trojan Horse (malware)|Trojan Horse]]" is a program which seems useful, but contains a virus (or other malware).  The main program may or not perform as advertised, but the distributor knows it is infected. A Trojan Horse carried virus typically does not replicate itself but is spread when the user copies the program.  In some cases, legitimate software may also be infected after release.  Even though the software by itself is legitimate and safe, infected copies can be distributed to attack unsuspecting users.  

#By email. When email software is configured to run scripts or programs attached to messages, the virus asks the email software to send it to recipients in the user's address book.

#Instant messaging: A direct computer-to-computer link required for instant messaging can be misused to deliver a virus.

#Misleading advertising. A "[[Trojan Horse (malware)|Trojan Horse]]" is a program which seems useful, but contains a virus (or other malware).  The main program may or not perform as advertised, but the distributor knows it is infected. A Trojan Horse carried virus typically does not replicate itself but is spread when the user copies the program.

 

A virus which infects networks is called a "worm".

==Anti-virus tactics==

==Anti-virus tactics==