Is reformating because of the CCleaner incident excessive

[Reviake]

Running W10 home 64-bit and I know they said it only affected 32 bit systems, but I had a trojan from it which I found with malwarebytes and removed it, but I am just worrying if I should maybe reformat anyways or is that just insanely excessive?

 

[theyeti87]

If peace of mind is what you're after, there's nothing wrong with reinstalling Windows just to be sure.

That being said, from what I understand about the CCleaner malware, it is currently not being instructed to do anything to the host system. That, of course, can change by a figurative flip of a switch.

 

[mdd1963]

Considering they claimed it only targeted 32 bit systems, I'd say reformatting 64 bit systems in sympathy is excessive, but, it's good practice reformatting, I guess... (That would be assuming folks were even using the affected 5.33 versions? How many skip CCleaner nag updates that come once every week anyway?)

Although it was a CCleaner exploit for Windows, I'm reformatting my FreeNAS system!

 

[Avast-Team]

In the team's latest update regarding the incident, we stand by our recommendation for consumers to update to the latest version of CCleaner (which is now 5.35, after revoking the security certificate used to sign the impacted version)

https/blog.avast.com/progress-on-ccleaner-investigation

The Piriform news release provides additional information; only specific versions of the 32-bit apps were affected (no other Piriform products, or Avast products, were impacted)

http/www.piriform.com/news/release-announcements/2017/9/18/security-notification-for-ccleaner-v5336162-and-ccleaner-cloud-v1073191-for-32-bit-windows-users