Following the take-down of the CnC server and getting access to its data, the Avast Security Threat Labs team has been working around the clock to investigate the source and other details of the recent Piriform CCleaner attack. To recap, the attack affected a total of 2.27M computers between August 15, 2017 and September 15, 2017 and used the popular PC cleaning software CCleaner version 5.33.6162 as a distribution vehicle. Today, we would like to report on the progress so far.
