CZ: Three weeks after ransomware attack, Olomouc continues to recover while still being threatened by threat actors

On April 9, noted a report that the municipality f Olomouc had suffered a cyber attack on April 7. There were almost no details other than the municipality estimated it might take two weeks to fully restore services. Since then, a few more details have emerged.

We now know that it was the Avaddon threat actors who were responsible for the attack. They added Olomouc to their dedicated .onion leak site with a typical threatening message about what would happen if Olomouc did not pay their demand.

Threat actors list Olomouc on leak site
Screencap by

As proof of access and exfiltration, the threat actors posted some files allegedly exfiltrated from Olomouc’s server. Because we cannot translate images of scanned docs in another language, we are not posting any of them here lest they contain any personal information.

In any event, based on what happened next, it seems clear that Olomouc did not pay what NewsWep reports was a $100,000 demand for the decryption key (although other sources indicate that the ransom demand was considerably higher).  Reportedly in revenge, Avaddon threat actors began a DDoS attack on the municipality and has given them another 5-day deadline to comply (pay) or all files that they claim to possess will be dumped.

Avaddon has a history of using DDoS attacks in combination with their ransomware attacks to put additional pressure on victims to pay them.  At the time of this publication, the site is online.

On April 27, Olomouc issued the following notice (translated):

Two and a half weeks after the start of the cyber attack, the services of almost all municipal agendas are available to the public. The exception is the Trade Licensing Office, but intensive work is being done to put its agenda into operation. Over the weekend, the same hacker group targeted attacks on the city’s public Web sites, causing complications on the city’s Web sites, which were shut down as a precaution after administrators promptly identified the attack.

All agendas of the City of Olomouc, with the exception of the trade department, are already in operation this week. So nowhere does a citizen come across an announcement that this or that agenda is not working. “In the case of some departments, such as property law, construction, environment, transport or local greenery and waste management, software support is not yet fully implemented. Folta. At the same time, IT specialists are working to make the operation of the municipal digital infrastructure and all special applications better, faster and, of course, safer every day.

There was also an attack on the city’s website over the weekend , when the same hacking group targeted attacks on web servers in order to eliminate their availability. “The IT team quickly detected the attack, took countermeasures, and shut down the servers as a precaution. Web portals will be limited in terms of functionality for now. it is a city for the restoration of infrastructure on its own, without the city paying the required ransom to the attackers, “Folta added.

Previous coverage by the municipality can be found here:

Reporting by Chum1ng0. Additional reporting and editing by Dissent






in summary 17 days ago we had talked about this news that the municipality of was being attacked by a ransomware, this update wants to tell you who is behind the attack, the municipality is being extorted by the well known avaddon group, on their offer page they have 7 days left to pay the ransom, otherwise there would be exfiltrated information, meanwhile the page is down due to a DDoS attack.


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