' Piriform CCleaner v was released on the 15th of August, and a regularly scheduled update to CCleaner, without compromised code, was released on the 12th of September. ' Our new parent company, the security company Avast, determined on the 12th of September that the 32-bit version of our CCleaner v and CCleaner Cloud v products, which may have been used by up to 3 percent of our users, had been compromised in a sophisticated manner,' the company admits in a statement published yesterday. As well as digging out outdated cache files and other space-wasters, CCleaner can be used to find and delete a range of unwanted software programs including selected forms of malware - giving the news that the company's software has itself become a malware vector that little twist of irony. Originally launched as Crap Cleaner prior to a rebrand to the more polite CCleaner, Piriform's best-known utility aims to reduce the amount of crud that builds up on your average computer over time. Piriform, owned by security firm Avast, has warned users of its popular CCleaner utility that a breach had it distributing a backdoor Trojan Horse for up to a month - affecting an estimated 2.27 million users.

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