South Korea's National Police Agency has warned of North Korean hacker groups targeting the country's defense industry to steal technology.

Notorious North Korean hacker groups Lazarus, Andariel, and Kimsuky have successfully infiltrated several South Korean defense companies.

These hacking attempts have been described as 'an all-out war' and include network infiltrations, theft of account information, and email server exploits.

Investigations reveal these attacks use sophisticated techniques, prompting special inspections by the Police and Defense Acquisition Program Administration.

South Korean authorities are urging defense companies to bolster cybersecurity by implementing network security enhancements, regular password changes, and two-factor authentication.

Additional recommendations include blocking foreign IP addresses and strengthening overall cybersecurity practices to mitigate future attacks from North Korean hackers.