Avast’s handling of the incident was seen by many as what should be the textbook response to such incidents. The compromise occurred in 2017 before Avast acquired the popular product, with later analysis revealing that the infamous APT group sometimes called Deputy Dog but often referred to simply as APT 17 was behind the attack, deploying their Floxif malware via CCleaner downloads.
Before the Czech security firm Avast acquired Piriform, the company which developed and maintained the popular registry cleaner CCleaner, the popular product had been compromised.
