Bossert wrote that North Korea's "malicious behavior" has gone on for years and is growing more egregious.
Looking ahead, Bessert writes that the US will take steps to curtail North Korea's "ability to mount attacks, cyber or otherwise".
Global financial and economic losses from the WannaCry attack that crippled computers in at least 150 countries in May was estimated to be in the billions, making it one of the most damaging incidents involving so-called ransomware. In retaliation for the cyberattack, President Donald Trump plans to summon "all responsible states" to unite against North Korea and push for new United Nations Security Council sanctions, according to The Hill. The malware targeted several hospitals in the United Kingdom, as well as banks and various other infrastructures and companies worldwide, causing malfunctions in critical sectors.
"The WannaCry ransomware exploited a vulnerability in mostly older versions of Microsoft's Windows operating system".
Microsoft president Brad Smith likened the theft to "the US military having some of its Tomahawk missiles stolen", and argued that intelligence agencies should disclose such vulnerabilities rather than hoarding them.
"The US is trying to shift responsibility for tensions on the Korean Peninsula to us with its dialogue offensive", the North Korean daily Rodong Sinmun said in a report.More news: LiAngelo & LaMelo Ball Sign 1-Year Contract To Play In Lithuania
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Mr Oh was shot and badly wounded by his fellow North Korean soldiers while fleeing across the border into the South last month.
The offer of dialogue without strings attached appeared to offer a way through an impasse that has lasted for years, during which North Korea's rogue development of nukes has allowed it to threaten the USA mainland with greater credibility than ever before.
The Lazarus Group is also thought to be behind the 2014 cyber attack against Sony, which resulted in the leak of several unreleased films.
"Medical staff at the Armed Forces Hospital will continue to provide proper care and treatment for Oh", said a South Korean defence ministry official.
While North Korea is the main focus of Bossert's claims in the Op-Ed, he does not forget to talk about alleged 2016 election meddling by Russian hackers or the US's issues with Iran either.