Malicious NuGet Packages Stole ASP.NET Data; npm Package Dropped Malware

Four malicious NuGet packages and one rogue npm package were caught stealing ASP.NET Identity data and deploying C2 backdoors — racking up over 50,000 downloads before they got yanked. This isn't just another dependency drama — it's a full-blown supply chain breach targeting .NET devs and JavaScript ecosystems simultaneously.

The packages were designed to look legit but packed hidden payloads that exfiltrated sensitive authentication data and established command-and-control channels. Think of it as a Trojan horse in your package manager — except it's stealing your credentials instead of invading Troy.

This is why you can't just blindly trust open-source packages anymore. These weren't amateur scripts — they were sophisticated attacks designed to blend in and fly under the radar while siphoning off your most sensitive data.

The packages have been removed, but the damage is done — thousands of projects potentially compromised. If you've been using any suspicious-looking packages recently, now's the time to audit your dependencies and check for unusual network activity.

This attack shows how vulnerable the software supply chain remains — and why security needs to be baked into your development workflow, not bolted on as an afterthought. Next time you run 'npm install' or 'dotnet add package', remember: you might be inviting more than just code into your project.