The app, Adware Doctor, claimed to remove malicious files and malware from your Mac. But security researcher Patrick Wardle found that the app was also collecting user data, including browser history, without consent and sending it to a server based in China.
Apple confirmed to CNET that it removed the app from the App Store. But before it was taken down, Adware Doctor reached the No. 1 spot in the paid utilities app category, and ranked fourth in top paid apps overall, Wardle notes.
Apple prohibits apps from collecting this kind of data without consent.