HARRISBURG, Pa. (AP) 鈥 Pennsylvania's state courts agency said Thursday that it never received a ransom demand as part of a cyberattack that briefly shut down some of its online services earlier this month and prompted a federal investigation.
, called a 鈥渄enial of services鈥 attack, on the website of the Administrative Office of Pennsylvania Courts disabled some online portals and systems that were all fully restored this week, officials said.
The attack didn't compromise any data or stop the courts from operating on a normal schedule, officials said.
A courts agency spokesperson said officials there never received a ransom demand from the attackers, never had any communication with the attackers and never paid anything to meet any sort of demand.
The state Supreme Court's chief justice, Debra Todd, said a federal investigation was continuing.
Neither the courts nor the FBI or the federal government鈥檚 lead cybersecurity agency, the U.S. Cybersecurity and Infrastructure Security Agency, have identified the attacker. There have been no apparent claims of responsibility.
The FBI and CISA have confirmed their involvement in investigating the matter but said Thursday they had no other information to give about the investigation.
In a statement, Todd said the 鈥渟ignificant and serious鈥 attack was 鈥渙rchestrated by a faceless and nameless virtual opponent who was intent on attacking our infrastructure and orchestrating a shutdown of our state judicial system.鈥
鈥淭hese anonymous actors attempted to undermine our mission to make justice accessible and to shutter the operation of the statewide court system," Todd said.
A 鈥渄enial of service鈥 cyberattack is common and happens when attackers flood the targeted host website or network with traffic or requests until the site is overwhelmed or crashes.
The attack comes after Kansas鈥 judicial branch was the victim of what it called a 鈥 鈥 late last year from which it and to recover. That attack was blamed on a Russia-based group.
In recent years, Microsoft , as were some . Some of the biggest attacks have been attributed to Russian or Chinese hackers.
Cybersecurity experts say denial-of-service hackers are often state-backed actors seeking money and can use tactics to hide their identity. Such attacks can mask an underlying attack, such as a ransomware attack, experts say.
Networking experts can defuse the attacks by diverting the flood of internet traffic.
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