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Breaking Down an Access-Code-Gated Malware Delivery Chain

In this post, we present an interesting malware delivery chain observed through Joe Sandbox Cloud Basic. At first glance, the sample appears difficult to analyze dynamically: execution is gated by an access code, the second stage is protected by time-based checks, and additional packing is applied. As a result, dynamic analysis alone is insufficient to fully uncover the attack. To overcome these obstacles, we combine Joe Reverser and Joe Sandbox to reconstruct the full delivery chain, from the initial phishing email to the final payload.

Happy New Year 2026

Thank you to our customers and friends for your support throughout 2025. The entire Joe Security team wishes you good health, success, and many wonderful moments in 2026..

Introducing Joe Reverser, the Agentic Automated Malware & Phishing Analyst

Today, we’re excited to introduce a brand-new product: Joe Reverser 0.9.0 (Beta) Silver Wolf. In short, Joe Reverser is an agent powered by SOTA LLM that leverages reversing tools to perform high-quality static and dynamic analysis.