Microsoft says hackers viewed source code, didn’t change it

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Microsoft said Thursday in a blog pos t that hackers tied to a massive intrusion of dozens of U.S. government agencies and private companies snuck farther into its systems than previously thought, although the intrusion doesn’t appear to have caused any additional harm.

The company said the hackers were able to view some of the code underlying Microsoft software, but weren’t able to make any changes to it.

Microsoft played down any risk associated with the additional intrusion, noting that its software development relies on code sharing within the company, a practice called “inner source.” Likewise, Microsoft said it doesn’t rely on keeping program code secret as a security measure and instead assumes that adversaries have seen its code and uses other defensive measures to frustrate attacks.

The company said it found no evidence of hacker access to customer data and no indication that its systems were used to attack others.

The hack began as early as March when malicious code was snuck into updates to SolarWinds software that monitors computer networks. Microsoft helped respond to the breach with cybersecurity firm FireEye, which discovered the hack when the security firm itself was targeted.

Cybersecurity experts and U.S. officials suspect Russia was behind the hack that infiltrated over 40 federal agencies, including the departments of Treasury, Energy and Commerce, as well as government contractors. Russia has denied that it is to blame.

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