North Korea hacked S. Korea's key officials phones

Seoul's spy agency on Tuesday accused North Korea of having hacked into the smartphones of dozens of key South Korean officials, stealing text and voice messages and their phone call logs.

The announcement came a day after North Korea warned of pre-emptive nuclear strikes in response to the start of Seoul-Washington military drills it views as an invasion rehearsal. This year's drills are the largest ever, meant to respond to the North's recent nuclear test and long-range rocket launch.

The National Intelligence Service said in a statement that the cyberattacks were made between late February and early March. It didn't say which officials' phones were hacked or whether the stolen text and voice messages contained any sensitive information.

The statement said North Korea also unsuccessfully tried to hack into email accounts of South Korean railway officials earlier this year in a preparation for cyberattack on the South's railway transport control system.

It also attacked the server of a major software firm specialising in providing security software for Internet banking.

"North Korea has been mounting a series of attacks against our cyberspace" following its nuclear test on January 6, the statement said, adding that they appeared to have been preparation for a major cyber assault on South Korea's banking network. "If left unchecked, it would have resulted in major financial chaos, such as paralysis of Internet banking systems and unwanted transfers of deposits", it said.

According to the agency, North Korean hackers also sent text messages to the South Korean officials, trying to lure them to links infected with malware that could capture the phone numbers of other officials. Last year alone, North Korea contaminated some 60,000 personal computers in the South and abroad, turning them into "zombie" PCs that can be used as weapons for cyber attacks, the agency said. Presiding over a meeting Tuesday with 14 government agencies, as well as the defence ministry, Financial Services Commission and science ministry, an NIS deputy director urged them to maintain a high level of vigilance.

Seoul has blamed North Korean hackers for a series of past cyber-attacks on military institutions, banks, government agencies, TV broadcasters and media websites as well as a nuclear power plant. The United States also said the North was behind a damaging cyber-attack on Sony's Hollywood film unit over its controversial North Korea-themed satirical film "The Interview" in 2014.

A spokesman for the presidential Blue House said the growing cyber threat from the North added urgency to the passage of the anti-cyber terror law, now pending in the National Assembly. But the main opposition Minjoo Party said the government was exaggerating the threat to secure surveillance powers for the NIS that could be used against political opponents. A former head of the NIS was jailed for three years in February 2015 for meddling in the 2012 presidential election.

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