“More than 2 million users are estimated to have downloaded a maliciously modified version of a software utility owned by antivirus firm Avast.
The affected application, CCleaner, helps users perform routine maintenance on their systems, and provides functionality such as temporary files deletion, performance optimization analysis, and application management. Developed by Piriform Ltd, which was acquired by Avast in July, the software had around 2 billion total downloads as of November 2016.
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Source: Millions Download Maliciously Modified PC Utility | SecurityWeek.Com