1. COEN 252 Computer Forensics
Investigating Hacker Tools

2. Program Analysis Given an executable, how do we find out what it does?
Try to find the program online.
Perform source code review.
Execute the program in a sandbox.

3. Program Compilation Compiler Assembler Linker
Translates HLL code to Assembly / ILL
Assembler
Translates Assembly code to machine language
Linker
Creates object code out of several modules.
A program usually makes library calls (stdio)

4. Program Compilation
Statically Linked: All library code is part of the object code
Dynamically Linked: Program calls library functions. (DLL)
Stripping: Removes all symbols from object code.
Packing with UPX.

5. Program Compilation
Static compilation needs more memory

6. Program Analysis Static Analysis: Determine the type of executable.
file in Unix
exetype in Windows
Symbol Extraction:
Use a program like strings to find symbols left in object code.
Names give hints on program.
Will not work for stripped files.

7. Program Analysis Find the program online:
Use the name of the file to find online versions.
Use strings to check whether this is a similar file.
Use same compiler to compile the online version and check for similarity.

8. Program Analysis
Investigate source code

9. Program Analysis Dynamic Analysis of a Hacker Tool Create a sandbox.
VMWare
Do not connect to the internet.
Sniff on a closed network.
On Unix, use strace.
Monitors OS calls.
On Windows, use Filemon, Regmon, ListDLLs, PsList, Fport