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Hiding Keys in CPU

The Hiding Data in SSE2 technique is an evasion method that stores sensitive information—such as encryption keys or small payloads—directly in the CPU's SSE2 XMM registers (XMM0–XMM15) rather than in conventional RAM. On Windows systems, it requires only user-level privileges and is considered easy to implement. The process involves defining a 16-byte secret (fitting the 128-bit size of an XMM register), copying it into a 16-byte aligned array, loading it into an SSE2 register using intrinsics like _mm_load_si128 (from emmintrin.h), and then securely wiping the original data from memory (e.g., via memset and string clearing). This leaves the sensitive data exclusively in the CPU register, evading traditional memory-scanning tools, forensic memory dumps, and many endpoint detection solutions that do not inspect register states. The data can later be retrieved using _mm_store_si128 for use during execution, making it a lightweight, low-privilege method for protecting short secrets in red-team or malware scenarios, though it is detectable by advanced runtime protections or tools that dump and analyze CPU registers. Technique Database: Access 50+ real malware techniques with weekly updates, complete with code, PoCs, and AV scan results: https://0x12darkdev.net/techniques Courses: Learn how real malware works on Windows OS from beginner to advanced taking our courses, all explained in C++. https://0x12darkdev.net/courses Modules: Dive deep into essential malware topics with our modular training program! Get a new module every 14 days. Start at just $0.99 per module, or unlock lifetime access to all modules for $100. https://0x12darkdev.net/modules