By Josh Smith
SEOUL (Reuters) -When Daniel DePetris, a U.S.-based&nbsp;foreign&nbsp;affairs analyst, received an email in October from the director of the 38&nbsp;North&nbsp;think-tank commissioning an article, it seemed to be business as usual.
It wasn't.
The sender was actually a suspected&nbsp;North&nbsp;Korean&nbsp;spy seeking information, according to those involved and three&nbsp;cybersecurity&nbsp;researchers.
Instead of infecting his computer and stealing sensitive data, as hackers typically do, the sender appeared to be trying to elicit his thoughts on&nbsp;North&nbsp;Korean&nbsp;security issues by pretending to be 38&nbsp;North&nbsp;director Jenny Town.
"I realized it wasn't legit once I contacted the person with follow up questions and found out there was, in fact, no request that was made, and that this person was also a target," DePetris told Reuters, referring to Town. "So I figured out pretty quickly this was a widespread campaign."
The email is part of a&nbsp;new&nbsp;and previously unreported campaign by a suspected&nbsp;North&nbsp;Korean&nbsp;hacking group, according to the&nbsp;cybersecurity&nbsp;experts, five targeted individuals and emails reviewed by Reuters.
The&nbsp;cybersecurity&nbsp;experts&nbsp;suspect the hackers are targeting people who are influential in&nbsp;foreign&nbsp;governments to better understand where Western policy is headed on&nbsp;North&nbsp;Korea.
The hacking group, which&nbsp;researchers dubbed Thallium or Kimsuky, among other names, has long used &ldquo;spear-phishing&rdquo; emails that trick targets into giving up passwords or clicking attachments or links that load malware. Now, however, it also appears to simply ask&nbsp;researchers or other&nbsp;experts&nbsp;to offer opinions or write reports.
According to emails reviewed by Reuters, among the other issues raised were China&rsquo;s reaction in the event of a&nbsp;new&nbsp;nuclear test; and whether a "quieter" approach to&nbsp;North&nbsp;Korean&nbsp;"aggression" might be warranted.
"The attackers are having a ton of success with this very, very simple method," said James Elliott of the Microsoft Threat Intelligence Center (MSTIC), who added that the&nbsp;new&nbsp;tactic&nbsp;first emerged in January. "The attackers have completely changed the process."
MSTIC said it had identified "multiple"&nbsp;North&nbsp;Korea&nbsp;experts&nbsp;who have provided information to a Thallium attacker account.
A 2020 report by U.S. government&nbsp;cybersecurity agencies said Thallium has been operating since 2012 and "is most likely tasked by the&nbsp;North&nbsp;Korean&nbsp;regime with a global intelligence gathering mission."
Thallium has historically targeted government employees, think tanks, academics, and human rights organisations, according to Microsoft.
"The attackers are getting the information directly from the horse's mouth, if you will, and they don't have to sit there and make interpretations because they're getting it directly from the expert," Elliott said.
NEW&nbsp;TACTICS
North&nbsp;Korean&nbsp;hackers are well-known for attacks netting millions of dollars, targeting Sony Pictures over a film seen as insulting to its leader, and stealing data from pharmaceutical and defence companies,&nbsp;foreign&nbsp;governments, and others.
North&nbsp;Korea's embassy in London did not respond to a request for comment, but it has denied being involved in&nbsp;cyber&nbsp;crime.
In other attacks, Thallium and other hackers have spent weeks or months developing trust with a target before sending malicious software, said Saher Naumaan, principal threat intelligence analyst at BAE Systems Applied Intelligence.
But according to Microsoft, the group now also engages with&nbsp;experts&nbsp;in some cases without ever sending malicious files or links even after the victims respond.
This&nbsp;tactic&nbsp;can be quicker than hacking someone's account and wading through their emails, bypasses traditional technical security programmes that would scan and flag a message with malicious elements, and allows the&nbsp;spies&nbsp;direct access to the&nbsp;experts' thinking, Elliott said.
"For us as defenders, it's really, really hard to stop these emails," he said, adding that in most cases it comes down to the recipient being able to figure it out.
Town said some messages purporting to be from her had used an email address that ended in ".live" rather than her official account, which ends in ".org", but had copied her full signature line.
In one case, she said, she was involved in a surreal email exchange in which the suspected attacker, posing as her, included her in a reply.
DePetris, a fellow with Defense Priorities and a columnist for several&nbsp;newspapers, said the emails he has received were written as if a&nbsp;researcher were asking for a paper submission or comments on a draft.
"They were quite sophisticated, with think tank logos attached to the correspondence to make it look as if the inquiry is legitimate," he said.
About three weeks after receiving the faked email from 38&nbsp;North, a separate hacker impersonated him, emailing other people to look at a draft, DePetris said.
That email, which DePetris shared with Reuters, offers $300 for reviewing a manuscript about&nbsp;North&nbsp;Korea's nuclear programme and asks for recommendations for other possible reviewers. Elliot said the hackers never paid anyone for their&nbsp;research&nbsp;or responses, and would never intend to.
GATHERING INFORMATION
Impersonation is a common method for&nbsp;spies&nbsp;around the world, but as&nbsp;North&nbsp;Korea's isolation has deepened under sanctions and the pandemic, Western intelligence agencies believe Pyongyang has become particularly reliant on&nbsp;cyber&nbsp;campaigns, one security source in Seoul told Reuters, speaking on condition of anonymity to discuss intelligence matters.
In a March 2022 report, a panel of&nbsp;experts&nbsp;that investigates&nbsp;North&nbsp;Korea's U.N. sanctions evasions listed Thallium's efforts as among activities that "constitute espionage intended to inform and assist" the country's sanctions avoidance.
Town said in some cases, the attackers have commissioned papers, and analysts had provided full reports or manuscript reviews before realising what had happened.
DePetris said the hackers asked him about issues he was already working on, including Japan's response to&nbsp;North&nbsp;Korea's military activities.
Another email, purporting to be a reporter from Japan's Kyodo&nbsp;News, asked a 38&nbsp;North&nbsp;staffer how they thought the war in Ukraine factored in&nbsp;North&nbsp;Korea's thinking, and posed questions about U.S., Chinese, and Russian policies.
"One can only surmise that the&nbsp;North&nbsp;Koreans are trying to get candid views from think tankers in order to better understand U.S. policy on the&nbsp;North&nbsp;and where it may be going," DePetris said.
(Reporting by Josh Smith. Editing by Gerry Doyle)

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North Korean cyber spies deploy new tactic: tricking foreign experts into writing research for them