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Microsoft obtained a court order to disrupt the largest botnet in the world.


Angela Lang/CNET

This story is part of Elections 2020, CNET’s coverage of the run-up to voting in November.

A group of tech companies dismantled a powerful hacking tool used by Russian attackers just three weeks before the US presidential election. On Monday, Microsoft announced actions against Trickbot, a Russian botnet that’s infected more than a million computers since 2016 and that’s behind scores of ransomware attacks. 

Cybersecurity experts have raised concerns about ransomware attacks casting doubt on election results. While a ransomware attack wouldn’t change votes and could only lock up machines, the chaos stirred by a cyberattack could create uncertainty about the outcome of the results. 

Election officials in most states have offline backup measures in the event of a ransomware attack, but have a harder time tackling the disinformation that comes with getting hacked.

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The effort is part of what Gen. Paul Nakasone, the head of Cyber Command, calls “persistent engagement,” or the imposition of cumulative costs on an adversary by keeping them constantly engaged. And that is a key feature of CyberCom’s activities to help protect the election against foreign threats, officials said.

“Right now, my top priority is for a safe, secure, and legitimate 2020 election,” Nakasone said in August in a set of written responses to Washington Post questions. “The Department of Defense, and Cyber Command specifically, are supporting a broader ‘whole-of-government’ approach to secure our elections.”

Trickbot is malware that can steal financial data and drop other malicious software onto infected systems. Cyber criminals have used it to install ransomware, a particularly nasty form of malware that encrypts users’ data and for which the criminals then demand payment — usually in cryptocurrency — to unlock.

Brian Krebs, who writes the

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