Removing ad.yieldmanager spyware

This talks about how to remove it. You might install ClamXav so it can do a full disk scan, to see if anything else is hiding. Carolyn Samit also suggests looking in ~/Library/Internet Plugins and /Library/Input Managers.

JayJ47 wrote:

I believe my power-pc mac mini has been infected with the insidious spyware known as "ad.yieldmanager.com".

Not really spyware, just a tracking cookie which can be easily eliminated by doing what you have already done. You didn't mention what you use for a browser, but with Safari all you needed to do was bring up Safari Preferences->Security and click on the Show Cookies button. Then scan down until you find ad.yieldmanager.com and click the Remove button. You can also get rid of all cookies by choosing Reset Safari... from the Safari menu, then checking the box for Remove all cookies. But this will cause you to loose cookies that may contain things which make your browser experience better (e.g. it will forget all the "Remember Me" settings).

None of the behavior you described is consistent with tracking cookies. All they do is record the sites you visit and perhaps some of the information you enter while there.

There are over 1100 known tracking cookies in existence today. MacScan claims there are 8000 and will remove them all for a price. I block most all of them by using an extension called Ghostery which you can read about here. There is at least one other choice available.