[thiagooffm]

not using CCleaner would be a start.

pay attention to the version of what you are using and avoid using things on auto-update or on a version which haven't been battleproof.

use linux and check the source code of everything you run... but it's a lot of work

so basically I don't think you could've done much, nor most of the people can unless you would accept living in a very walled and time-consuming computer setup

[Piskvorrr]

Most Linux users would have been caught the same way, what with PPAs and autoupdates. If a trusted party is compromised, it's essentially game over.