Berlin’s public administration detected a cyberattack on its state network in mid-August after suspected data exfiltration that investigators believe occurred between 7 and 12 August. The intrusion may have begun at least a week before discovery; Berlin temporarily isolated the Senate departments responsible for transport and for construction and housing, then reconnected all Senate departments while forensic work continued. The Berlin LKA, public prosecutors, and federal security authorities are investigating the breach.
The Rhysida ransomware group has claimed responsibility and alleges it stole roughly 5.8 TB of data, demanding 30 Bitcoin—worth more than €2 million—and threatening to publish the material. The group claims the haul includes personal, personnel, financial, credential, legal, health, infrastructure, and potentially classified records affecting about 12,076 people, but Berlin has not verified the authenticity, sensitivity, or scope of the alleged data and says it will not pay. Officials said no election-related data has been identified as compromised ahead of the state-parliament election.

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The Rhysida ransomware group claimed responsibility for the attack and alleged it had stolen about 5.79 TB of data, demanding 30 Bitcoin while threatening to publish the material. Berlin confirmed it faced an extortion attempt and said it would not pay; the purported stolen data and its contents had not been independently verified.
Berlin authorities learned that the incident involved an extortion attempt and potentially significant data theft. The scope, types, and sensitivity of exfiltrated data remained uncertain.
Berlin reconnected all Senate departments to the state network while forensic teams continued examining affected systems.
Berlin first publicly disclosed the cyberattack on its state-government administrative network. It isolated the Senate Department for Mobility, Transport, Climate Protection and Environment and another department following the compromise.
Berlin authorities discovered that its public-administration state network had been compromised. The affected Senate administrations for transport and for construction and housing were disconnected from the network, and the LKA and public prosecutors began investigating.
An affected Berlin Senate department internally identified an initial data outflow. Forensic investigators later assessed that data exfiltration occurred from August 7 through August 12.
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