Politicians and employees of several parties received emails purporting to be sent from NATO headquarters, but which instead contained a link that installed spyware on the recipient's computer, the Sueddeutsche Zeitung daily and regional broadcasters NDR and WDR reported.
Citing unnamed security experts, German media said the attacks on August 15 and 24 appeared to have been carried out by state-backed Russian hackers.
A document circulated by Germany's Federal Office for Information Security (BSI), seen by AFP on Wednesday, warned lawmakers of the attacks.
He was referring to a series of cyber attacks that had hit the US Democrats this year. Hillary Clinton's presidential campaign has blamed Russia for the intrusion that resulted in an embarrassing leak of emails in July.
As in the US case, the BSI fears that the hackers could leak confidential party information in a bid to influence public opinion just before Germany holds general elections next year.
That rogue operation hitting the Bundestag involved an aggressive attack called Sofacy or APT 28 that had also struck NATO members and knocked French TV station TV5Monde off air.
Unlike last year's attack, this summer's affected not only specific parliamentary groups, but wider party operations such as the regional network of the Christian Democratic Union in the western state of Saarland, or the federal offices of the Left party.
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