Trend Micro is aware of and has been closely monitoring the latest software security hack that has affected Piriform CCleaner program.

We assure you that the latest version of Trend Micro Security provides effective protection against this software security hack.


It has been reported that a version of Piriform CCleaner.exe has been compromised/trojanized resulting in the installation of multi-stage backdoor capable of receiving instructions from threat actors on affected systems.

Get the latest information about Trend Micro protection against CCleaner Hack here.

Affected Versions

  • CCleaner version 5.33.6162
  • CCleaner Cloud version 1.07.3191


Here are the steps to make sure you are protected from the Trojanized CCleaner:

  1. Make sure you are using the latest version of Trend Micro Security. You can check here if you already have the latest version or follow instructions here to upgrade Trend Micro Security to the latest version.
  2. Make sure your Trend Micro Security has the latest Security and Program updates. You can check here to manually update your Trend Micro Security.
  3. Make sure you upgrade to the latest version of CCleaner and remove the affected versions.

Additional Assistance

Trend Micro highly recommends that vendor critical patches should be applied as soon as possible upon release. Customers and partners who have questions are encouraged to contact Trend Micro Technical Support for assistance.

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