German authorities have identified a 16-year-old as the alleged mastermind of the KillSec ransomware operation, following a coordinated law enforcement operation that resulted in the arrests of three suspects and searches of eight properties in Spain, Greece, Romania, and the UK.
In an Oct. 1 statement, Hamburg police said investigators also took control of KillSec's leak website and secured at least 110TB of data to prevent further unauthorized access.
"Operation KillSwitch" Cybercrime Takedown
The developments stem from "Operation KillSwitch," an international investigation that German law enforcement led into roughly 1,000 suspected KillSec cyberattacks worldwide, at least 70 of which involved government organizations. Investigators have so far confirmed about 500 of those attacks to be successful.
Authorities from multiple countries, including Germany, the United States, the United Kingdom, Spain, Romania, and Greece, took part in the investigation. Europol and Eurojust coordinated the international effort, while cybersecurity firms Bitdefender and Group-IB provided technical support.
"The coordinated action targeted both the people behind KillSec and the systems they relied on," Europol said in a press statement. Authorities raided eight homes across four countries, provisionally arrested three individuals, and took control of five servers and other infrastructure that KillSec was using to manage its activities and store victim data, it added. "Authorities also took control of domains operated by KillSec and redirected visitors to a law enforcement seizure notice."