
Now that it's known the CCleaner backdoor actively installed a payload that went undetected for more than a month, Williams renewed his advice that people who installed the 32-bit version of CCleaner 5.33.6162 or CCleaner Cloud 1.07.3191 reformat their hard drives. He said simply removing the stage-one infection is insufficient given the proof now available that the second stage can survive and remain stealthy.
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