Introduction to ida python
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1. This document introduces IDAPython, which allows users to write Python scripts to automate tasks in IDA like reversing binaries. 2. It discusses how to install IDAPython and provides some simple examples of using it to walk functions and disassembly. 3. More complex examples are provided for finding system calls in a binary and for deobfuscating code using IDAPython scripts. Exercises are suggested for finding vulnerabilities using IDAPython.
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![Application
- Find ‘CALL’ instructions
# searchSystemCalls.py
from idautils import *
seg_ea = SegByName(".text")
# For each instruction
for addr in Heads(seg_ea, SegEnd(seg_ea)):
# Get disassembly
disasmStr = GetDisasm(addr)
if disasmStr.startswith( "int ") == True:
# Print if it is a system call
print "0x%08x [%s]" % (addr, disasmStr)](https://image.slidesharecdn.com/introductiontoidapython-131230160823-phpapp02/85/Introduction-to-ida-python-9-320.jpg)
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- 1. Introduction to IDAPython Byoungyoung Lee POSTECH PLUS 038 [email protected]
- 2. Overview • Brief intro to IDAPython • How to install • Examples – Searching disassembly patterns – Searching system calls in the binary – Deobfuscation
- 3. Automatic Reversing with IDA • To do automatic reversing ? – you need to write scripts • IDA supports multiple interfaces – Plugins (C++) – IDC (C-like scripting) – IDAPython (Python)
- 4. Brief intro to IDAPython • Most things you can do w/ your hands – can be done w/ IDAPython
- 5. How to install • COPY ‘python’ directory – to %IDA_DIR% • PUT ‘python.plw’ – to %IDA_DIR%/plugins • ex) C:Program FilesIDA52plugins
- 6. How to execute 1. Press ‘ALT+9’ in IDA 2. Choose Python file you’d like to execute Results would be printed in the log window
- 7. Simple example – walking the functions # walkFunctions.py ### Walk the functions # Get the segment's starting address ea = ScreenEA() # Loop through all the functions for function_ea in Functions(SegStart(ea), SegEnd(ea)): # Print the address and the function name. print hex(function_ea), GetFunctionName(function_ea)
- 8. Simple example – walking the instructions # walkInstructions.py # For each of the segments for seg_ea in Segments(): # For each of the defined elements for head in Heads(seg_ea, SegEnd(seg_ea)): # If it's an instruction if isCode(GetFlags(head)): # Get the Disasm and print it disasm = GetDisasm(head) print disasm
- 9. Application - Find ‘CALL’ instructions # searchSystemCalls.py from idautils import * seg_ea = SegByName(".text") # For each instruction for addr in Heads(seg_ea, SegEnd(seg_ea)): # Get disassembly disasmStr = GetDisasm(addr) if disasmStr.startswith( "int ") == True: # Print if it is a system call print "0x%08x [%s]" % (addr, disasmStr)
- 10. Deobfuscation • What is obfuscation? – To transform binary into something • which has the same executing behavior • which has very different outer representation – To disrupt disassemblers
- 11. Deobfuscation • How to obfuscate the binary – Simple obfuscation methods JMP X = PUSH X RET JMP X = XOR JZ original ECX, ECX X obfuscated
- 12. Deobfuscation • What happens due to these obfuscation? – IDA failed to analyze the binary properly • which means .. • YOU CANNOT USE CFG LAYOUT • YOU CANNOT EASILY FOLLOW THE CONTROL FLOW
- 13. Deobfuscation • Let’s learn deobfuscation w/ an example – 1. – 2. – 3. – 4. load reversing500 in IDA move to 0x08049891, and see ‘PUSH/RET’ execute ‘deobfuscation_simple.py’ see the instructions of 0x08049891 – For full deobfuscation • execute ‘deobfuscation_full.py’
- 14. Exercises (more applications) • 1. To list all string copy functions? – such as strcpy(), strncpy(), strcat(), and etc. – YES ,this is for finding Stack Overflow vulns. • 2. To examine all malloc() calls? – whose arg. is determined dynamically – YES ,this is for finding Heap Overflow vulns. • 3. Memory/Register Computation Back Tracer
- 15. Reference • “Introduction to IDAPython” by Ero Carrera