All malware is bad. They trick you with a phishing email so you open a link that infects your computer, and takes it over.
But, even compared to all the malware out there, Dyre stands out as one of the worst. It infects your Web browser, so they cybercriminals can steal your credentials. Its method of attack is called "man in the browser" because it monitors your Web activity to see if you visit specific sites, such as your bank.
Dyre (also known as Dyreza, or Dyzap), which is delivered by a downloader called Upatre, has been around for at least a year. In fact, over the summer, we told you about Dyre infecting routers.
Dyre was already known to affect Internet Explorer, Google Chrome, Mozilla Firefox and other browsers. It also monitors about 150 banks in the United States and Europe.
There isn't an easy way to tell if you're a victim of this malware. However, Microsoft says one red flag is if your firewall suddenly requests higher access privileges to explorer.exe or svchost.exe.