One of the biggest attacks came from a macro virus known as W97M/Melissa.A. It’s grown to a level in which even Microsoft warns about them in its own site. One of the most common types of a typical viruses is the Microsoft Word macro virus. Some programs offer some level of access (like Microsoft Word) and can really put your computer at risk. Every virus needs some form of access to the Windows application programming interface (API). Depending on how complex the program is, a virus can even collect information from your computer and send it home without any sign of wrongdoing. A CHM virus will open the Windows Help program and use some of its features to harm your computer. Screensaver (SCR) and batch (BAT) files are good examples of this, and you’ll find plenty of viruses with this extension to this day.īesides executable files, you can also have a virus that manipulates the program that opens it, like malicious Windows Help (CHM) files. First of all, a file doesn’t have to have the EXE extension to execute.
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