The CCleaner Malware Fiasco Targeted at Least 20 Specific Tech Firms

Hundreds of thousands of computers getting penetrated by a corrupted version of an ultra-common piece of security software was never going to end well. But now it’s becoming clear exactly how bad the results of the recent CCleaner malware outbreak may be.

Researchers now believe that the hackers behind it were bent not only on mass infections, but on targeted espionage that tried to gain access to the networks of at least 20 tech firms.

Earlier this week, security firms Morphisec and Cisco revealed that CCleaner, a piece of security software distributed by Czech company Avast, had been hijacked by hackers and loaded with a backdoor that evaded the company’s security checks. It wound up installed on more than 700,000 computers. On Wednesday, researchers at Cisco’s Talos security division revealed that they’ve now analyzed the hackers’ “command-and-control” server to which those malicious versions of CCleaner connected.

On that server, they found evidence that the hackers had attempted to filter their collection of backdoored victim machines to find computers inside the networks of 20 tech firms, including Intel, Google, Microsoft, Akamai, Samsung, Sony, VMware, HTC, Linksys, D-Link and Cisco itself. In about half of those cases, says Talos research manager Craig Williams, the hackers successfully found a machine they’d compromised within the company’s network, and used their backdoor to infect it with another piece of malware intended to serve as a deeper foothold, one that Cisco now believes was likely intended for industrial espionage.

“When we found this initially, we knew it had infected a lot of companies,” says Williams. “Now we know this was being used as a dragnet to target these 20 companies worldwide…to get footholds in companies that have valuable things to steal, including Cisco unfortunately.”

A Wide Net

Cisco says it obtained a digital copy of the hackers’ command-and-control server from an unnamed source involved in the CCleaner investigation. The server contained a database of every backdoored computer that had “phoned home” to the hackers’ machine between September 12 and 16. That included over 700,000 PCs, just as Avast has said in the days since it first revealed its CCleaner debacle. (Initially the company put the number much higher, at 2.27 million.) But the database also showed a list of specific domains onto which the hackers sought to install their secondary malware payload, as well as which ones received that second infection.

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