Analysis and Extraction of Compressed Data in .rxdb Files

📅 2025-05-15 — Session: Analysis and Extraction of Compressed Data in .rxdb Files

🕒 00:05–00:30
🏷️ Labels: Data Extraction, Compression, Rxdb, LZ4, Zlib
📂 Project: Dev
⭐ Priority: MEDIUM

The session aimed to analyze and extract embedded dictionaries and compressed data blocks from .rxdb files without recompiling C++ code.

Explored methods to test hypotheses and extract embedded dictionaries using shell commands and Python scripts.
Analyzed the structure of .rxdb files to determine if they were compressed or encrypted, using entropy and statistical tests.
Diagnosed specific blocks within .rxdb files for compression issues, focusing on zlib and gzip headers.
Employed tools like binwalk, grep, dd, file, and custom scripts to extract and analyze compressed data blocks.
Identified LZ4 magic signatures in .rxdb files and outlined steps for extraction and decompression.

Developed strategies for diagnosing and extracting compressed data blocks using various tools and scripts.
Identified potential compression formats and provided troubleshooting steps for LZ4 decoding errors.

Further investigation into alternative compression formats and manual offset reading for data extraction.
Implementation of a C++ script for reading strings from specific offsets if required.