Fake LinkedIn job posting: how fake recruiters breach SMBs
The "technical test" that compromises the developer's laptop and opens the door to the whole company.
Audience: Companies and Operations · Risk level: ATTENTION
Blindfy Intelligence Unit · Technical review by Blindfy
Scenario
A developer is approached on LinkedIn for a senior role at an international company. After a good conversation with the "recruiter", he receives a GitHub repository for a technical challenge. When he runs the project locally, hidden scripts in package.json (postinstall) install an infostealer on his laptop — which also has access to the company environment.
How the scam works
Operators create fake profiles with synthetic photos, invented histories and a shell company. They steer technical victims (devs, DevOps, infra) to repositories with a postinstall payload, or challenges "to run locally". The final target is rarely the professional — it is the company where they work.
Common mistake
Treating the "technical test" as a neutral hiring step. For criminals, it is the most efficient entry vector into SMBs without environment segregation.
Impact
Compromised corporate credentials, access to private repositories, intellectual property leaks and a persistent backdoor installed in the development environment.
What works
Blindfy monitors technical employees' exposure, delivers targeted training against malicious recruitment and structures a mandatory "isolated environment" policy for running any externally sourced code.
Protection checklist
- Forbid running external code on corporate machines
- Provide an isolated VM for personal technical tests
- Verify recruiters' identity through the real company
- Train the technical team on LinkedIn social engineering vectors
- Monitor fake profiles approaching employees
- Audit postinstall and package.json scripts during onboarding
- Deploy EDR on every development laptop
Editorial sources
- CERT.br / NIC.br — Cartilha de Segurança para Internet
- ENCCLA / Ministério da Justiça — Enfrentamento a golpes digitais
The interview is the new phishing. The technical test is the new malicious attachment. Treat LinkedIn with the same suspicion as an unknown email.
