The data was uploaded online and later promoted via Twitter, starting a few days before the Christmas holiday. The source of the data appears to be the victims' smartphones. Details about how the data was stolen and exfiltrated from infected phones remain unclear, at the time of writing.

According to German news outlets [1, 2, 3], which first reported the hack, the leaked data contains names, home addresses, phone numbers, email addresses, photo IDs, personal photos, and personal chat histories.

The leak affects politicians part of all of Germany's left and centrist political parties, such as the CDU, CSU, SPD, Greens, Left Party, and the FDP. Data from Germany's populist right-wing party, the AfD (Alternative for Germany), was not included.