Reverse Engineering Malware Using NSA’s Open-Source Disassembler
✍️ By CyberDudeBivash | Cybersecurity & AI Expert
🌐 www.cyberdudebivash.com

🎯 What is Ghidra?

Ghidra is an open-source reverse engineering tool developed by the NSA. It supports disassembling, decompiling, and analyzing binaries across various architectures including x86, x64, ARM, MIPS, and more. It's widely used for malware reverse engineering due to its powerful decompiler and scripting capabilities.

🧪 Malware Sample Prep

🧼 1. Set Up a Safe Environment

• Use a sandboxed VM (like Remnux or FlareVM)

• Install Ghidra, Wireshark, Procmon, and x64dbg

• Isolate network access and take snapshots

📁 2. Collect a Sample

• Ensure the file hash is recorded (sha256sum sample.exe)

• Run static checks using:

  • PEStudio

  • Detect It Easy (DIE)

  • BinText or Strings

  • VirusTotal & Hybrid Analysis

🛠️ 3. Load in Ghidra

Step-by-Step:

1. Launch Ghidra

2. Create a new project (Non-Shared Project → MalwareAnalysisProject)

3. Import binary (e.g., sample.exe)

4. Accept format (Portable Executable for Windows) → click OK

5. Run Auto-Analysis → allow default options unless analyzing a packed sample

🔍 4. Key Disassembly & Reverse Engineering Tasks

🔑 A. Identify Entry Point

• Navigate to entry in the Symbol Tree

• Disassemble with right-click → “Disassemble”

🔍 B. Explore Functions

• Use the Functions Window to see discovered routines

• Use Function Graph to see basic block structures

🧠 C. Analyze Suspicious Behavior

Look for calls to:

• WinExec, CreateProcessA/W, LoadLibrary

• VirtualAlloc, WriteProcessMemory, SetWindowsHookEx

• Registry and file modifications

🧬 D. Use the Decompiler (F5)

• Click any function → press F5 to view decompiled C-like code

• Annotate suspicious logic:

  • C2 server IPs

  • File dropper behavior

  • Anti-debugging checks

🧰 5. Advanced Analysis

⚔️ A. Detect Packers

• Lots of jumps, indirect calls, or missing imports? Might be packed.

• Use Dynamic Instrumentation with x64dbg to unpack manually

🤖 B. Scripting with Ghidra

• Use Python (Jython) or Java to automate:

  python
  CopyEdit
  for f in currentProgram.getFunctionManager().getFunctions(True):
      print(f.getName())
  

🔐 C. Identify Encryption/Decryption

• Look for loops operating on buffers

• Look for XOR, RC4, or custom crypto routines

🛡️ 6. Report Your Findings

Include:

• Malware Hash (SHA256, MD5)

• IOC List (IPs, domains, file paths)

• Functions of interest

• Obfuscation or packing indicators

• Decryption logic or config extraction

🧠 Expert Tips from CyberDudeBivash

“Always work backwards from the payload. Identify dropped files, registry keys, and persistence mechanisms. Use Ghidra’s scripting to automate detection across malware families.”

📎 Example Malware for Practice

Try reversing:

• NetWire RAT

• AgentTesla

• RedLine Stealer

⚠️ Always use these in an offline virtual lab.

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