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CRITICAL2026-05-29via TheHackerNews

🚨 Malicious Sicoob NuGet Steals Banking Credentials as npm Packages Target Cloud Secrets Breach — Data Exposed

Malicious Sicoob NuGet Steals Banking Credentials as npm Packages Target Cloud Secrets suffered a data breach. Here's what happened, what data was exposed, and what you should do right now.

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ACCOUNTS
CRITICAL
SEVERITY
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DATA TYPES

What Happened

Cybersecurity researchers have discovered a malicious NuGet package that masquerades as a C# software development kit for Sicoob, one of Brazil's largest cooperative financial systems, to siphon client IDs and PFX certificates.

According to Socket, versions 2.0.0 through 2.0.4 of "Sicoob.Sdk" contain functionality to exfiltrate sensitive information, including PFX certificates that are used to

Impact

  • Affected accounts: Under investigation
  • Data exposed: user data
  • Severity: CRITICAL
  • Source: [TheHackerNews](https://thehackernews.com/2026/05/malicious-sicoob-nuget-steals-banking.html)

    • What You Should Do

    If you have an account with Malicious Sicoob NuGet Steals Banking Credentials as npm Packages Target Cloud Secrets, take these steps immediately:

  • **Change your password** — Use a unique, strong password (16+ chars with mixed case, numbers, symbols)
  • **Enable 2FA** — Turn on two-factor authentication if available
  • **Check your email** — Search for breach notifications from Malicious Sicoob NuGet Steals Banking Credentials as npm Packages Target Cloud Secrets
  • **Monitor your accounts** — Watch for unauthorized access on any service where you reused the same password
  • **Scan your site** — If you run a website, [run a free ScanMyVibe scan](https://scanmyvibe.co/scan) to check if your own security headers and configurations protect against common attack vectors

    • Is Your Website Secure?

    Data breaches often exploit weak security configurations — missing Content-Security-Policy headers, misconfigured CORS, exposed API keys. These are exactly the issues ScanMyVibe detects in under 30 seconds.

    [Scan your site free →](https://scanmyvibe.co/scan)

    Timeline

  • 2026-05-29 — Breach reported
  • 2026-05-29 — ScanMyVibe breach alert published
  • Ongoing — Investigation in progress

    • This article is auto-generated by ScanMyVibe's breach monitoring system. Sources are verified but details may evolve as investigations progress. Last updated: 2026-05-29.

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