Google safety researchers are warning folks to be looking out for a squad of sly hackers believed to be North Korean brokers.

Like final 12 months’s Twitter VIP account takeovers, the newly found hacking marketing campaign, unveiled Monday, reveals the effectiveness of so-called social engineering—or good old style trickery. On this case, the hackers lured victims by presenting themselves, by faux on-line personas, as pleasant pc safety execs.

The attackers sought first to determine their reputations. They did this, partly, by importing doctored YouTube movies of supposed hacks to point out off their expertise. (“A cautious overview of the video reveals the exploit is faux,” Google researchers famous.) In addition they blogged concerning the interior workings of software program vulnerabilities, typically impersonating professional cybersecurity consultants in “visitor” creator posts.

After constructing credibility, the hackers moved to ensnare their marks. They despatched messages to cybersecurity execs utilizing quite a lot of channels: Twitter, LinkedIn, Telegram, Discord, Keybase, and e mail, amongst them. Members of so-called “infosec” Twitter, the net neighborhood of safety execs, are sharing screenshots and anecdotes of their encounters with the predators—a point of pride for some.

The wool-clad wolves used two strategies to compromise folks’s machines. Generally they’d ship a goal an contaminated file below the pretense of collaborating on vulnerability analysis. As soon as downloaded, the file would set up a “backdoor” on the goal’s machine.

Different occasions, the hackers used what’s known as a “drive by” assault. They’d ask the mark to go to their web site, which ran poisoned code. Even seemingly innocuous searching may result in malware set up. (I gained’t hyperlink to the location right here, for apparent causes.)

Alarmingly, Google isn’t fairly positive how the hackers contaminated folks’s computer systems utilizing the drive-by technique. The victims have been operating “totally patched and up-to-date Home windows 10 and Chrome browser variations,” that means their defenses have been up, Google researcher Adam Weidemann wrote. “At the moment we’re unable to substantiate the mechanism of compromise, however we welcome any data others might need,” he stated, urging folks to report any findings by Google’s bug bounty program.

“We hope this publish will remind these within the safety analysis neighborhood that they’re targets to government-backed attackers and will stay vigilant when participating with people they haven’t beforehand interacted with,” Weidemann stated.

I’d add that it’s not simply safety researchers who ought be looking out. In the event you’ve obtained one thing different folks may need—whether or not that’s the “keys” for account possession resets at Twitter, coveted hacking exploits, a relationship with different contacts who might be focused, or no matter else—then, eventually, you’re going to be a goal too.

By no means drop your guard.

Robert Hackett

Twitter: @rhhackett

robert.hackett@fortune.com