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Posts by Sergio Castell - Security Researcher

You Shipped the Fix, but Your Old App Is Still Out There, Now What?

11 minute read | September 8, 2026

Here’s a security incident scenario. You ship a mobile app with insufficient tampering protection, and someone finds it. Now the app can be modified and repackaged into a malicious version with almost no effort.

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    Sergio Castell - Security Researcher

    6 min read | September 9, 2025

    Protect Against Evolving Malware Attacks with Threat Monitoring

    Android Protection Dexguard Threatcast Threat monitoring
    Bypassing Key Attestation: How Remote Devices Exploit the API https://www.guardsquare.com/blog/bypassing-key-attestation-api
    Protect Against Evolving Malware Attacks with Threat Monitoring https://www.guardsquare.com/blog/fight-malware-attacks-with-threat-monitoring