From BBC News
Hackers who booby-trapped widely used security software also used their malware to infiltrate machines at tech firms, suggests analysis.
Evidence that other companies had been compromised came to light as Cisco researchers probed how attackers got at the popular CCleaner programme.
Millions of people downloaded a Windows version that hackers had laced with malicious code.
Cisco said the attackers were seeking valuable intellectual property.
Last week CCleaner creator Piriform revealed that attackers had managed to place a hijacked copy of version 5.33 that works on Windows on some download servers. The booby-trapped code was available for about a month between August and September,