Idalib Analysis

IDA Pro Headless Analysis with idalib

Use this skill to analyze binary files with IDA Pro's Python API in headless mode.

Setup

First, ensure IDA Pro is installed by running:

$CLAUDE_PROJECT_DIR/.claude/skills/idalib-analysis/scripts/install-ida.sh

Wait for the script to complete before proceeding. This may take a few minutes on first run.

Use the IDA Domain API

Always prefer the IDA Domain API over the legacy low-level IDA Python SDK. The Domain API provides a clean, Pythonic interface that is easier to use and understand.

Documentation Resources

Available API modules: bytes, comments, database, entries, flowchart, functions, heads, hooks, instructions, names, operands, segments, signature_files, strings, types, xrefs

To fetch specific API documentation, use URLs like:

• https://ida-domain.docs.hex-rays.com/ref/functions/index.md - Function analysis API
• https://ida-domain.docs.hex-rays.com/ref/xrefs/index.md - Cross-reference API
• https://ida-domain.docs.hex-rays.com/ref/strings/index.md - String analysis API

Opening a Database

from ida_domain import Database
from ida_domain.database import IdaCommandOptions

# Open with auto-analysis enabled and save database for faster subsequent runs
ida_options = IdaCommandOptions(auto_analysis=True, new_database=False)
with Database.open("path/to/binary", ida_options, save_on_close=True) as db:
    # Your analysis here
    pass
# Database is automatically closed and saved

Key Database Properties

with Database.open(path, ida_options) as db:
    db.minimum_ea      # Start address
    db.maximum_ea      # End address
    db.metadata        # Database metadata
    db.architecture    # Target architecture

    db.functions       # All functions (iterable)
    db.strings         # All strings (iterable)
    db.segments        # Memory segments
    db.names           # Symbols and labels
    db.entries         # Entry points
    db.types           # Type definitions
    db.comments        # All comments
    db.xrefs           # Cross-reference utilities
    db.bytes           # Byte manipulation
    db.instructions    # Instruction access

Common Analysis Tasks

List functions:

for func in db.functions:
    name = db.functions.get_name(func)
    print(f"{hex(func.start_ea)}: {name} ({func.size} bytes)")

Get function disassembly and pseudocode:

func = next(f for f in db.functions if db.functions.get_name(f) == "main")
for line in db.functions.get_disassembly(func):
    print(line)

# Pseudocode requires Hex-Rays decompiler license - handle gracefully
try:
    for line in db.functions.get_pseudocode(func):
        print(line)
except RuntimeError as e:
    print(f"Decompilation unavailable: {e}")

Find strings:

for s in db.strings:
    print(f"{hex(s.address)}: {s}")

Cross-references:

# References TO an address
for xref in db.xrefs.to_ea(target_addr):
    print(f"Referenced from {hex(xref.from_ea)} (type: {xref.type.name})")

# References FROM an address
for xref in db.xrefs.from_ea(source_addr):
    print(f"References {hex(xref.to_ea)}")

# Specific xref types
for xref in db.xrefs.calls_to_ea(func_addr):
    print(f"Called from {hex(xref.from_ea)}")

Read bytes:

byte_val = db.bytes.get_byte_at(addr)
dword_val = db.bytes.get_dword_at(addr)
disasm = db.bytes.get_disassembly_at(addr)

Analysis Methodology

Write and execute small, focused scripts rather than reading large amounts of data from the binary. This approach is more efficient and produces better results:

1. Form a hypothesis about what you're looking for
2. Design a script to gather the minimum data needed to test the hypothesis
3. Execute the script and analyze the results
4. Iterate based on findings

Example: Investigating a suspicious function

Instead of dumping all disassembly, write targeted scripts:

# Script 1: Find functions that reference interesting strings
from ida_domain import Database
from ida_domain.database import IdaCommandOptions

ida_options = IdaCommandOptions(auto_analysis=True, new_database=False)
with Database.open("sample.exe", ida_options, save_on_close=True) as db:
    for s in db.strings:
        if "password" in str(s).lower():
            print(f"\nString at {hex(s.address)}: {s}")
            for xref in db.xrefs.to_ea(s.address):
                print(f"  Referenced from {hex(xref.from_ea)}")

# Script 2: Analyze a specific function found in Script 1
with Database.open("sample.exe", ida_options, save_on_close=True) as db:
    target_addr = 0x401234  # Address from previous script
    for func in db.functions:
        if func.start_ea <= target_addr < func.end_ea:
            print(f"Function: {db.functions.get_name(func)}")
            print(f"Signature: {db.functions.get_signature(func)}")

            # Try pseudocode first (requires Hex-Rays license)
            try:
                print("\nPseudocode:")
                for line in db.functions.get_pseudocode(func):
                    print(f"  {line}")
            except RuntimeError:
                # Fall back to disassembly if decompiler unavailable
                print("\nDisassembly (decompiler unavailable):")
                for line in db.functions.get_disassembly(func):
                    print(f"  {line}")
            break

Performance Tips

1. Enable auto_analysis=True on first open to let IDA analyze the binary
2. Use save_on_close=True to persist the analysis database (.idb/.i64)
3. Subsequent opens are faster because analysis results are cached in the .idb
4. Write focused scripts that gather specific data rather than iterating over everything

Troubleshooting

• Check /tmp/claude-idalib.log for installation and setup issues
• Database files (.idb/.i64) are created alongside the binary
• If imports fail, verify IDA Pro is installed and IDADIR is set

Decompilation Not Working

Pseudocode/decompilation requires a Hex-Rays decompiler license, which is separate from the IDA Pro base license. If get_pseudocode() or get_microcode() fails with RuntimeError, check the license status:

import ida_hexrays

# Check if decompiler is available
def is_decompiler_available():
    """Check if Hex-Rays decompiler is licensed and available."""
    if not ida_hexrays.init_hexrays_plugin():
        return False

    # Try a test decompilation - MERR_LICENSE (-23) means no license
    import ida_funcs
    for func_ea in range(db.minimum_ea, db.maximum_ea):
        func = ida_funcs.get_func(func_ea)
        if func:
            hf = ida_hexrays.hexrays_failure_t()
            cfunc = ida_hexrays.decompile(func.start_ea, hf)
            if cfunc:
                return True
            # Error code -23 is MERR_LICENSE
            if hf.code == -23:
                return False
            break
    return False

Error codes reference:

• MERR_LICENSE (-23): No valid Hex-Rays decompiler license
• MERR_ONLY32 (-24): 32-bit decompiler not available (need hexx86 plugin)
• MERR_ONLY64 (-25): 64-bit decompiler not available (need hexx64 plugin)

Workaround when decompilation is unavailable: Use disassembly analysis instead - the get_disassembly() method always works and provides assembly-level insight.

Exploring the API at Runtime

When the documentation doesn't answer your question, explore the API directly:

import inspect
from ida_domain import Database
from ida_domain.functions import Functions

# List all public methods on a class
for name, method in inspect.getmembers(Functions, predicate=inspect.isfunction):
    if not name.startswith('_'):
        print(f"{name}: {inspect.signature(method)}")

# Get docstring for a specific method
print(Functions.get_pseudocode.__doc__)

# Within a database context, explore available attributes
with Database.open(path, ida_options) as db:
    # List all database properties
    print([attr for attr in dir(db) if not attr.startswith('_')])

Legacy API (Avoid)

The legacy idc, idautils, ida_funcs APIs still work but are harder to use. Prefer the Domain API for new analysis scripts. Only use legacy APIs when Domain API doesn't expose needed functionality.

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