Killnet, the group that has claimed responsibility for the attack on Lithuania, has been posting on its Telegram account information about planned and executed Distributed Denial of Service (DDoS) attacks.

Service disruptions

In a video message, the group says it has launched the attacks in retaliation for the restrictions imposed by Lithuania a week and a half ago on the transit of some goods to Russia's Kaliningrad exclave.

After EU sanctions against Russia took effect, Lithuania restricted the transit of steel and ferrous metals to Kaliningrad, a move it said was based on clarification from the European Commission.

The State Tax Inspectorate (VMI) on Monday put its IT systems on hold for security concerns after recording "an unusually high number of logins".

"Please be advised that VMI customers' data is secure," the tax authority said. "The VMI website, the My VMI system and telephone services are currently down."

Evelina Gudzinskaite, director of the Migration Department, confirmed to BNS on Monday that information system disruptions were causing delays in the issuing of passports and residence permits in Lithuania.

'We are under attack'

Tadas Vasiliauskas, spokesman for Lietuvos Oro Uostai (Lithuanian Airports, LOU), confirmed to BNS that the state-owned company's websites had experienced some disruptions.

"We have some disruptions, but everything is functioning. Our systems are functioning," he said.

The BSS business management system implementation and maintenance services provider BSS IT said its website had been down for the last few hours.

"We know from the public space that there is a risk and we are under attack. Our website, where we publish information, has been attacked," said Nerijus Jankauskas, the company's CEO.

In its Telegram account, the Killnet group identified websites of businesses providing document management system services as its targets.

The Lithuanian National Cyber Security Centre last week warned about an increase in DDoS incidents. State-owned Lietuvos Gelezinkeliai (Lithuanian Railways) then said it had been hit with cyber-attacks.

Prime Minister Ingrida Simonyte noted on Monday that such attacks had been recurring since Russia's invasion of Ukraine in early February.

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