Infect other executable files by a variety of mechanisms. Win32 worms spread using Windows networking APIs, MAPI functions or email clients such as Microsoft Outlook. They may create email messages with the worm program attached or attach themselves to outgoing email messages. A message created by a worm often suggests that the recipient should launch the attachment to see something interesting or important. Infect other executable files.
Some viruses become memory resident and infect other programs when they are run.
Others actively seek out other files to infect. Infect other executable files. Some viruses become memory resident and infect other programs when they are run. Others actively seek out other files to infect. Infect other executable files using a variety of mechanisms.