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Democratic presidential nominee Joe Biden speaks with members of the United Steelworkers union in Detroit, Mich., on Sept. 9, 2020.

Chip Somodevilla/Getty Images

Microsoft Corp recently alerted one of Democratic presidential candidate Joe Biden’s main election campaign advisory firms that it had been targeted by suspected Russian state-backed hackers, according to three people briefed on the matter.

The hacking attempts targeted staff at Washington-based SKDKnickerbocker, a campaign strategy and communications firm working with Biden and other prominent Democrats, over the past two months, the sources said.

A person familiar with SKDK’s response to the attempts said the hackers failed to gain access to the firm’s networks. “They are well-defended, so there has been no breach,” the person said.

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SKDK Vice Chair Hilary Rosen declined to comment. A Biden spokesman did not respond to a request for comment.

Kremlin spokesman Dmitry Peskov dismissed the allegations as “nonsense”. Moscow has repeatedly denied using hacking to interfere in other countries' elections.

The hacking attempts on SKDK come as U.S. intelligence agencies have raised alarms about possible efforts by foreign governments to interfere in the November presidential election.

Investigations by former special counsel Robert Mueller and the Senate intelligence committee both concluded that affiliates of the Russian government interfered in the 2016 presidential election, and Mueller has warned that Russia was meddling in the current campaign. One of the sources said it was not clear whether Biden’s campaign was the target or whether the hackers were attempting to gain access to information about other SKDK clients.

SKDK managing director Anita Dunn was a White House communications director during the Barack Obama presidency and serves the Biden campaign as a senior advisor.

The attempts to infiltrate SKDK were recently flagged to the campaign firm by Microsoft, which identified hackers tied to the Russian government as the likely culprits, according to the three sources briefed on the matter.

The attacks included phishing, a hacking method which seeks to trick users into disclosing passwords, as well as other efforts to infiltrate SKDK’s network, the three sources said.

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A Microsoft spokesman declined to comment.

SKDK is closely associated with the Democratic Party, having worked on six presidential campaigns and numerous congressional races. In addition to its current work for Biden, the firm in 2018 worked on successful governor’s races in Kansas and Connecticut.

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