The news comes after South Korean President Yoon Suk Yeol warned
North Korea could stage provocations, such as cyber attacks or
spreading fake news, to interfere in April's parliamentary
elections.
The National Intelligence Service (NIS) said the South Korean
firms had been a key target of North Korean hackers since late
last year, and called for tougher security.
North Korea penetrated the servers of two companies in December
and February, stealing product design drawings and photographs
of their facilities, the NIS said.
"We believe that North Korea might possibly be preparing to
produce its own semiconductors in the face of difficulties in
procuring them due to sanctions," it said in a statement.
Also driving the North's efforts could be higher demand from its
satellite, missile and other weapons programs, it added.
Pyongyang has always denied involvement in cybercrimes, although
North Korea has been blamed for cyberattacks netting millions of
dollars.
The hackers employed a technique called "living off the land,"
which minimizes malicious codes and uses existing, legitimate
tools installed within the servers, making it difficult to
detect with security software, the NIS said.
(Reporting by Hyonhee Shin; Editing by Clarence Fernandez)
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