McAfee has reported that hackers have attempted to steal sensitive data from groups involved with next month's Winter Olympics in PyeongChang.
The security firm stated that a number of groups associated with the competition had received malicious emails, including several ice hockey teams and ski suppliers.
The emails were sent from a Singapore IP address and readers were instructed to open a text document that was written in Korean.
The emails were designed to trick the recipients into thinking that the emails were sent from South Korea's National Counter-Terrorism Center.
At the time, the centre was conducting anti-terror drills in the area.
It has been reported that in some cases, hackers used steganography, a technique more complex than phishing, which hides malware in text and images.
It is not yet known who carried out the attacks, only that the IP address came from Singapore.
The investigation is ongoing.
What happens next
Mcafee has warned that more attacks during the games are likely, and that previous attacks have led hackers to obtaining passwords and financial data.