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Topic 5.5 of In-Depth Malware Analysis
XOR encoding patterns, single-byte and multi-byte key extraction, standard algorithm identification via constants, FindCrypt2 and signsrch usage, custom Base64 alphabets, and a six-step decryption workflow.
By the end of this topic, you will
Quadrant 1 · e-Tutorial
Video content coming soon.
Quadrant 2 · e-Content
Quadrant 3 · Web Resources
Downloadable reference material
External links
FindCrypt2 — IDA Pro Crypto Constant Scanner
IDA Pro plugin that scans for cryptographic constants and annotates matches. Install in IDA plugins directory.
CyberChef — From Base64 with Custom Alphabet
Use the From Base64 operation with a custom alphabet field. Paste the 64-character alphabet found in the binary to decode non-standard encodings.
REMA eBook 2026 — Chapter 5, Cryptographic Identification
Full cryptographic constant reference table and XOR decryption examples in the REMA eBook Chapter 5.
Quadrant 4 · Self-Assessment
In-Depth Malware Analysis
Covers packed malware, manual unpacking, obfuscated PowerShell, fileless malware, code injection, API hooking, memory forensics with Volatility, sandbox analysis, and network signatures.
REMA Complete Assessment
A comprehensive 120-question assessment covering the entire Reverse Engineering and Malware Analysis curriculum: malware taxonomy and reverse engineering fundamentals, static and dynamic analysis, reversing malicious code, malicious web and document files, in-depth analysis of packed and fileless malware, and self-defending malware techniques.
