Mr Macron’s party, known as “En Marche!” or “Onwards”, said it had been hit by at least five advanced “phishing” attacks that involved trying to trick a broad number of campaign staff members to click on professional-looking fake web pages.
The latest attacks were confirmed by security firm Trend Micro, whose researchers found links to a cyber espionage group it has dubbed Pawn Storm, the Macron team noted.
Other experts link the group, also known as “Fancy Bear” or “APT28”, to Russian military intelligence agency GRU.
Russia has denied involvement in attacks on Mr Macron’s campaign.
Mr Macron, an independent centrist who has been critical of Russian foreign policy, faces far-right leader Marine Le Pen in France’s presidential runoff on 7 May.
Ms Le Pen has taken loans from Russian banks and has called for closer ties with Russia.
“Emmanuel Macron is the only candidate in the French presidential campaign to be targeted [in phishing attacks],” his party said in a statement, adding this was “no coincidence”.
In mid-February, an En Marche! official told a news conference the party was enduring “hundreds if not thousands” of attacks on its networks, databases and sites from locations inside Russia and asked the French government for assistance.
The Macron campaign said today it had carried out counter-offensive actions against the fake web sites, which were designed to trick campaign workers into divulging their user credentials.
As a further precaution, it also said En Marche! does not use email to share confidential information.
Netherlands-based researcher Feike Hacquebord of Trend Micro said this week he had found evidence that Pawn Storm, which has been active since 2004, had targeted the Macron campaign with email phishing tricks and attempts to install malware on the campaign site in mid-March.
Mr Hacquebord said some of the same digital fingerprints linked the Macron phishing attacks with those last year on the Democratic National Committee and US presidential candidate Hillary Clinton’s campaign.
He also found evidence that Pawn Storm was using similar techniques in the past two months to target two foundations tied to Germanys ruling coalition parties and to attack German Chancellor Angela Merkel’s party, the Christian Democratic Union, in April and May of last year.
Security firm Crowd Strike has said the group may be associated with the Russian military intelligence agency GRU.
Other U.S.-based firms Dell Secure Works, Fire Eye and Threat Connect have also said the group has ties to the Russian government.
Mr Hacquebord’s Tokyo-based Trend Micro has consistently said conclusive proof of Russian involvement is hard given the difficulty of attributing cyber attacks.
Asked about Trend’s findings that Mr Macron was under cyber attack, Kremlin spokesman Dmitry Peskov said on Monday: “What [hacking] groups? From where? Why Russia? This slightly reminds me of accusations from Washington, which have been left hanging in mid-air until now and do not do their authors any credit.”
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