North Korean hackers orchestrated a highly targeted attack against prominent individuals in the DPRK-watching community, cybersecurity firm Kaspersky detailed in a new report on Monday, using multiple malware strains with what one expert called “devastating” effects for privacy.

The report, which sheds new light on technical details of an attack against North Korean defector Kang Mi-jin and several others, reveals that hackers could remotely manipulate the malware from servers based in South Korea.

“By using multiple techniques together, they have been able to run a surveillance campaign on their victims which has been devastating to