Just noticed over on Kitz that the popular program CCleaner has been infected with a backdoor virus. Details at https://arstechnica.co.uk/information-technology/2017/09/ccleaner-malware-outbreak-is-much-worse-tha...
Interesting. Never used it myself, haven't had the need. Wonder what the total number of infections really is and how many will actually notice or check. Bet a load of folks now wish they made a proper system image for recovery.
The best place to find out is the Avast forum (Avast bought Piriform)
Not as bad as it seems, it was after commercial sites etc
But have a search anyway