The first symptom of the infection was the random opening of unrelated websites in a separate window with the target attribute set to “_blank.” Upon further investigation, I discovered that it was a JavaScript file located in the sidebar section. I have no idea how it got there, but I immediately removed it. I checked the website and found that the issue had been resolved. After that, I checked my Windows 7 machine with the latest versions of NOD32 and Kaspersky.