Users of a free software tool designed to optimize system performance on Windows PCs and Android mobile devices got a nasty shock this morning when Piriform, the company which makes the CCleaner tool, revealed in a
blog post that certain versions of the software had been compromised by hackers — and that malicious, data-harvesting software had piggybacked on its installer program.
The affected versions of the software are CCleaner 5.33.6162 and CCleaner Cloud 1.07.3191.
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“We estimate that 2.27 million users had the affected software installed on 32-bit Windows machines,” she further added.