That Dream Job From a LinkedIn Recruiter? The Attachment Is a Backdoor

A tempting message lands in your LinkedIn inbox. “Saw your profile. You’d be perfect for a senior role on our team.” The salary is good, the company looks legit, and a few video calls later you feel comfortable. Then they send a “coding assignment” to run locally. The moment you do, your laptop already belongs to someone else. This is the most cunning attack aimed at developers right now.

Let me break down how the fake-interview con works. One caveat up front: there wasn’t much fresh community discussion in the past 30 days, so this piece leans on the patterns and incidents that have piled up across the security industry over time.

Why Developers Are the Target

The way phone scams hunt the elderly, this attack zeroes in on developers — and the logic is uncomfortably sound.

First, running code is a developer’s day job. Cloning an unfamiliar GitHub repo, running npm install, building someone else’s project — none of it raises an eyebrow. Tell a regular user to “download and run this executable” and they hesitate. Tell a developer to “clone this repo and solve the interview task” and it sounds completely routine.

Second, a developer’s laptop is a treasure chest. Internal access keys, cloud credentials, crypto wallets, source-control permissions — all sitting in one place. Compromise one engineer and you’ve got a beachhead into the entire company.

Third, anyone weighing a job change is psychologically off guard. A great offer has a way of dimming everyone’s judgment.

How the Attack Plays Out

Here’s the typical script, step by step.

It starts with a convincing recruiter account. Real company logo, plausible work history, a respectable-looking network. Faking that on LinkedIn is trivial.

Then come the interviews. A few video calls build trust. Once you’ve “met” a person, even on a screen, your guard drops sharply.

Now the key move: the coding challenge. “This mirrors our real codebase — clone the repo and fix the bug.” Or “Install this npm package and run the demo.” That’s the trap.

The malware sits deep in the project. Not in the flashy main code, but obfuscated inside a build script or a single line of a dependency. Often a single npm install triggers it automatically during setup. The victim has no idea what they just ran.

Why npm Became the Main Stage

There’s a reason this con thrives in JavaScript territory. One security analysis reported that a group believed to be linked to North Korea pushed out 197 malicious npm packages, racking up more than 31,000 downloads.

npm allows auto-run scripts like postinstall to fire during installation. Meant as a convenience, it’s a perfect execution trigger for attackers. And the dependency tree runs deep — the package you install drags in dozens or hundreds of sub-dependencies, far too many for any human to audit by hand.

Pair that with info-stealers like ‘OtterCookie.’ These scrape saved browser passwords, crypto wallet data, and system credentials, then ship them off to a remote server. The “interview assignment” handles all of it in one shot.

How to Shut It Down

You don’t need an elaborate security suite. A few habits stop most of this.

The surest defense is running everything in an isolated environment. Never run an interview task you can’t fully vouch for on your main work laptop. A disposable VM, a container, or a separate cloud instance should be the default.

When you do run npm install, the --ignore-scripts flag blocks those auto-run scripts. For anything suspect, eyeball the scripts section of package.json before you build.

Verify the recruiter, too. Five minutes is enough to check whether the role is actually posted on the company’s official careers page and whether the recruiter’s email domain matches the real company domain. A legitimate hiring process never pressures you to “run this code locally right now.”

Finally, stay skeptical. If an assignment insists you “run this specific project as-is,” that’s the signal. Real interview tasks usually have you write code from scratch — they don’t ask you to execute someone else’s project wholesale.

The Takeaway

What makes this attack dangerous isn’t technical sophistication. It weaponizes a developer’s most natural instinct: running code someone else handed you. The better the offer looks, the more it’s worth pausing to question where it came from. That pause is your strongest line of defense.

So where do you run your interview assignments? If you’re still cloning unfamiliar repos onto your main laptop without a second thought, now’s the moment to reconsider.