If you have installed CCleaner you likely have to reformat your system.
>CCleaner malware outbreak is much worse than it first appeared
>The recent CCleaner malware outbreak is much worse than it initially appeared, according to newly unearthed evidence. That evidence shows that the CCleaner malware infected at least 20 computers from a carefully selected list of high-profile technology companies with a mysterious payload.
>Because the CCleaner backdoor was active for 31 days, the total number of infected computers is "likely at least in the order of hundreds," researchers from Avast, the antivirus company that acquired CCleaner in July, said in their own analysis published Thursday.
>From September 12 to September 16, the highly advanced second stage was reserved for computers inside 20 companies or Web properties, including Cisco, Microsoft, Gmail, VMware, Akamai, Sony, and Samsung. The 20 computers that installed the payload were from eight of those targeted organizations, Avast said, without identifying which ones. Again, because the data covers only a small fraction of the time the backdoor was active, both Avast and Talos believe the true number of targets and victims was much bigger.