Security Market Segment LS
Friday, 07 September 2018 08:59

N. Korean alleged to be behind WannaCry, no mention of NSA exploit

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The US Department of Justice has filed a criminal complaint against a North Korean cracker named Park Jin Hyok for allegedly being behind a 2104 hack of Sony Pictures and the May 2017 WannaCry ransomware attack.

An affidavit filed by FBI special agent Nathan Shields also alleged that Park was behind the theft of $81 million from Bangladesh Bank, the central bank of that country, in February 2016. One glaring omission was the fact that an NSA exploit used to craft WannaCry had been leaked on the Web by a group known as the Shadow Brokers in April 2017.

He was also accused of being behind numerous other unspecified break-ins at various private and government institutions.

Park was alleged to have worked for a North Korean front company known as Chosun Expo; some of the employees in branches of the firm abroad also did private work for clients. Park was said to have worked with a group in Dalian, China.

The affidavit said he had returned to North Korea before 2014 when the Sony hack was perpetrated, adding that he and others who worked with him always used IP addresses allocated to North Korea for both their state-sponsored hacks and private work.

Park was alleged to have a role in creating a worm known as Brambul that affected Windows computers and "could spread through self-replication by infecting new victim systems via brute force attacks on the victim’s Server Message Block protocol. SMB is a method that Microsoft systems use to share files on a network".

The attack on Sony Pictures came because of the release of a film titled The Interview which poked fun at North Korean leader Kim Jong-Un.

The attack on Bangladesh Bank involved targeting the networks of local banks in that country, using the SWIFT system that banks use to conduct financial transactions.

Apart from these specific hacks, the affidavit also claimed that Park and his associates had targeted American defence contractors, one university, academic researchers, and energy companies worldwide using spear-phishing emails.

The affidavit also mentioned the WannaCry attack in great detail but did not mention the fact that a leaked NSA exploit, known as Eternal Blue, had been used to create the ransomware. However, it made one mention of the Shadow Brokers, the group that stole and then leaked the NSA exploit, along with others, on the Web in April 2017.

British security researcher Marcus Hutchins brought an end to the havoc created by WannaCry, by registering a domain that he found with the code of the malware.

Hutchins is currently in Milwaukee in the US state of Wisconsin, awaiting trial on charges that he wrote and helped distribute a banking trojan known as Kronos, which is unrelated to the charges laid against Park.

Hutchins was arrested by the FBI in Las Vegas on 2 August 2017 after he had boarded a plane to leave the US after attending the annual DEFCON security conference.

The FBI affidavit against Park said it was "intended to show merely that there is sufficient probable cause for the requested complaint and arrest warrant and does not purport to set forth all of my knowledge of the government’s investigation into this matter."

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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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