Hackers with ties to Russia, China and Iran are attempting to snoop on people and groups involved with the US 2020 presidential election, Microsoft says.
The Russian hackers who breached the 2016 Democratic campaign are again involved, said the US tech firm.
Microsoft said it was “clear that foreign activity groups have stepped up their efforts” targeting the election.
Both President Donald Trump and Democrat Joe Biden’s campaigns are in the cyber-raiders’ sights.
The same attackers also targeted British political parties, said Microsoft, without specifying which ones.
Strontium is also known as Fancy Bear, a cyber-attack unit allegedly affiliated with Russia’s GRU military intelligence service.
Russia and China have denied the reports. On Friday Dmitry Peskov, a spokesman for President Vladimir Putin, said the Kremlin had never tried to interfere in other countries’ elections.
Chinese foreign ministry spokesman Zhao Lijian said Microsoft “should not make accusations against China out of nothing”.
“Similar to what we observed in 2016, Strontium is launching campaigns to harvest people’s log-in credentials or compromise their accounts, presumably to aid in intelligence gathering or disruption operations,” said Tom Burt, a Microsoft vice-president in charge of customer security and trust.
“What we’ve seen is consistent with previous attack patterns that not only target candidates and campaign staffers but also those they consult on key issues,” Mr Burt said.
“These activities highlight the need for people and organisations involved in the political process to take advantage of free and low-cost security tools to protect themselves.”
Microsoft also reported that Chinese groups had launched attacks on the personal email accounts of people affiliated with the Biden campaign, as well as “at least one prominent individual formerly associated with the Trump Administration”.
An Iranian group known as Phosphorus had unsuccessfully sought to access accounts of White House officials and Mr Trump’s campaign staff between May and June of this year, Microsoft added.
The firm was unable to determine the aims of the Russian, Chinese and Iranian hackers. In June Google also said it had detected cyber-hack attempts by China and Iran.
Trump campaign deputy press secretary Thea McDonald said: “We are a large target, so it is not surprising to see malicious activity directed at the campaign or our staff.”
A Biden campaign official said: “We have known from the beginning of our campaign that we would be subject to such attacks and we are prepared for them.”
The report comes a day after a whistleblower at the US Department of Homeland Security alleged he was put under pressure to downplay the threat of Russian interference in the US as it “made the president look bad”.
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