--- name: ghidra description: "Reverse engineer binaries using Ghidra's headless analyzer. Decompile executables, extract functions, strings, symbols, and analyze call graphs without GUI." --- # Ghidra Headless Analysis Skill Perform automated reverse engineering using Ghidra's `analyzeHeadless` tool. Import binaries, run analysis, decompile to C code, and extract useful information. ## Quick Reference | Task | Command | |------|---------| | Full analysis with all exports | `ghidra-analyze.sh -s ExportAll.java -o ./output binary` | | Decompile to C code | `ghidra-analyze.sh -s ExportDecompiled.java -o ./output binary` | | List functions | `ghidra-analyze.sh -s ExportFunctions.java -o ./output binary` | | Extract strings | `ghidra-analyze.sh -s ExportStrings.java -o ./output binary` | | Get call graph | `ghidra-analyze.sh -s ExportCalls.java -o ./output binary` | | Export symbols | `ghidra-analyze.sh -s ExportSymbols.java -o ./output binary` | | Find Ghidra path | `find-ghidra.sh` | ## Prerequisites - **Ghidra** must be installed. On macOS: `brew install --cask ghidra` - **Java** (OpenJDK 17+) must be available The skill automatically locates Ghidra in common installation paths. Set `GHIDRA_HOME` environment variable if Ghidra is installed in a non-standard location. --- ## Main Wrapper Script ```bash ./scripts/ghidra-analyze.sh [options] ``` Wrapper that handles project creation/cleanup and provides a simpler interface to `analyzeHeadless`. **Options:** - `-o, --output ` - Output directory for results (default: current dir) - `-s, --script ` - Post-analysis script to run (can be repeated) - `-a, --script-args ` - Arguments for the last specified script - `--script-path ` - Additional script search path - `-p, --processor ` - Processor/architecture (e.g., `x86:LE:32:default`) - `-c, --cspec ` - Compiler spec (e.g., `gcc`, `windows`) - `--no-analysis` - Skip auto-analysis (faster, but less info) - `--timeout ` - Analysis timeout per file - `--keep-project` - Keep the Ghidra project after analysis - `--project-dir ` - Directory for Ghidra project (default: /tmp) - `--project-name ` - Project name (default: auto-generated) - `-v, --verbose` - Verbose output --- ## Built-in Export Scripts ### ExportAll.java Comprehensive export - runs all other exports and creates a summary. Best for initial analysis. **Output files:** - `{name}_summary.txt` - Overview: architecture, memory sections, function counts - `{name}_decompiled.c` - All functions decompiled to C - `{name}_functions.json` - Function list with signatures and calls - `{name}_strings.txt` - All strings found - `{name}_interesting.txt` - Functions matching security-relevant patterns ```bash ./scripts/ghidra-analyze.sh -s ExportAll.java -o ./analysis firmware.bin ``` ### ExportDecompiled.java Decompile all functions to C pseudocode. **Output:** `{name}_decompiled.c` ```bash ./scripts/ghidra-analyze.sh -s ExportDecompiled.java -o ./output program.exe ``` ### ExportFunctions.java Export function list as JSON with addresses, signatures, parameters, and call relationships. **Output:** `{name}_functions.json` ```json { "program": "example.exe", "architecture": "x86", "functions": [ { "name": "main", "address": "0x00401000", "size": 256, "signature": "int main(int argc, char **argv)", "returnType": "int", "callingConvention": "cdecl", "isExternal": false, "parameters": [{"name": "argc", "type": "int"}, ...], "calls": ["printf", "malloc", "process_data"], "calledBy": ["_start"] } ] } ``` ### ExportStrings.java Extract all strings (ASCII, Unicode) with addresses. **Output:** `{name}_strings.json` ```bash ./scripts/ghidra-analyze.sh -s ExportStrings.java -o ./output malware.exe ``` ### ExportCalls.java Export function call graph showing caller/callee relationships. **Output:** `{name}_calls.json` Includes: - Full call graph - Potential entry points (functions with no callers) - Most frequently called functions ### ExportSymbols.java Export all symbols: imports, exports, and internal symbols. **Output:** `{name}_symbols.json` --- ## Common Workflows ### Analyze an Unknown Binary ```bash # Create output directory mkdir -p ./analysis # Run comprehensive analysis ./scripts/ghidra-analyze.sh -s ExportAll.java -o ./analysis unknown_binary # Review the summary first cat ./analysis/unknown_binary_summary.txt # Look at interesting patterns (crypto, network, dangerous functions) cat ./analysis/unknown_binary_interesting.txt # Check specific decompiled functions grep -A 50 "encrypt" ./analysis/unknown_binary_decompiled.c ``` ### Analyze Firmware ```bash # Specify ARM architecture for firmware ./scripts/ghidra-analyze.sh \ -p "ARM:LE:32:v7" \ -s ExportAll.java \ -o ./firmware_analysis \ firmware.bin ``` ### Quick Function Listing ```bash # Just get function names and addresses (faster) ./scripts/ghidra-analyze.sh --no-analysis -s ExportFunctions.java -o . program # Parse with jq cat program_functions.json | jq '.functions[] | "\(.address): \(.name)"' ``` ### Find Specific Patterns ```bash # After running ExportDecompiled, search for patterns grep -n "password\|secret\|key" output_decompiled.c grep -n "strcpy\|sprintf\|gets" output_decompiled.c ``` ### Analyze Multiple Binaries ```bash for bin in ./samples/*; do name=$(basename "$bin") ./scripts/ghidra-analyze.sh -s ExportAll.java -o "./results/$name" "$bin" done ``` --- ## Architecture/Processor IDs Common processor IDs for the `-p` option: | Architecture | Processor ID | |-------------|--------------| | x86 32-bit | `x86:LE:32:default` | | x86 64-bit | `x86:LE:64:default` | | ARM 32-bit | `ARM:LE:32:v7` | | ARM 64-bit | `AARCH64:LE:64:v8A` | | MIPS 32-bit | `MIPS:BE:32:default` or `MIPS:LE:32:default` | | PowerPC | `PowerPC:BE:32:default` | Find all available processors: ```bash ls "$(dirname $(./scripts/find-ghidra.sh))/../Ghidra/Processors/" ``` --- ## Troubleshooting ### Ghidra Not Found ```bash # Check if Ghidra is installed ./scripts/find-ghidra.sh # Set GHIDRA_HOME if in non-standard location export GHIDRA_HOME=/path/to/ghidra_11.x_PUBLIC ./scripts/ghidra-analyze.sh ... ``` ### Analysis Takes Too Long ```bash # Set a timeout (seconds) ./scripts/ghidra-analyze.sh --timeout 300 -s ExportAll.java binary # Skip analysis for quick export ./scripts/ghidra-analyze.sh --no-analysis -s ExportSymbols.java binary ``` ### Out of Memory Edit the `analyzeHeadless` script or set: ```bash export MAXMEM=4G ``` ### Wrong Architecture Detected Explicitly specify the processor: ```bash ./scripts/ghidra-analyze.sh -p "ARM:LE:32:v7" -s ExportAll.java firmware.bin ``` --- ## Tips 1. **Start with ExportAll.java** - It gives you everything and the summary helps orient you 2. **Check the interesting.txt file** - It highlights security-relevant functions automatically 3. **Use jq for JSON parsing** - The JSON exports are designed to be machine-readable 4. **Decompilation isn't perfect** - Use it as a guide, cross-reference with disassembly 5. **Large binaries take time** - Use `--timeout` and consider `--no-analysis` for quick scans

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