A malicious NuGet package named Braintree.Net typosquats the legitimate PayPal Braintree .NET SDK and implements a multi-stage .NET implant that intercepts payment card data, exfiltrates merchant API credentials, and harvests environment secrets upon assembly load. The package uses .NET ModuleInitializer attributes for code execution, production-only gating to avoid detection during QA, and XOR obfuscation for one of its C2 endpoints. Stolen data is POSTed to attacker-controlled infrastructure at api.348672-shakepay.com over HTTPS with silent error handling to avoid triggering investigation.
payment card skimming
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Fake Braintree NuGet Package Skims Credit Cards and Harvests Merchant Credentials