Cybercriminals linked to North Korea used a previously unknown type of malware to take control of computers at a South African freight logistics company, cybersecurity firm ESET disclosed on Thursday.

The newly discovered software, a so-called backdoor dubbed Vyveva, enabled hackers to steal data, gather information and run malicious code from at least two infected computers, the security researchers wrote in a report.

“This indicates that the intent of the operation is most likely espionage,” the researchers explained. The backdoor was reportedly controlled using Tor, an anonymization network used to hide commands sent by the