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Advance Digital Forensic

Advance Digital Forensic. Agenda. What is Computer Forensic? Gathering evidence from windows memory Advance registry forensic. Analyzing network data to collect evidence. Computer Forensics – the laws. First Law of Computer Forensics There is evidence of every action.

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Advance Digital Forensic

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  1. Advance Digital Forensic

  2. Agenda • What is Computer Forensic? • Gathering evidence from windows memory • Advance registry forensic. • Analyzing network data to collect evidence

  3. Computer Forensics – the laws • First Law of Computer Forensics There is evidence of every action. • Harlan Carvey’s Corollary :Once you understand what actions or conditions create or modify an artifact, then the absence of that artifact is itself an artifact.

  4. Tip of the “Digital” Iceberg Data as seen by a casual observer using common tools (Explorer Window, cmd shell, web browser etc. ) Data as seen by Forensic Investigators using his sophisticated toolkit. May include deleted data, hidden data, unauthorized information and records of illegal activity!

  5. Windows Memory Forensic • Extracting windows login credentials from RAM image. • Extracting running processes. • Extracting user assist keys from RAM • Viewing registry keys for all open process.

  6. Extracting windows login credentials from RAM image. • Volatility modules used • hivescan {python volatility hivescan -f <filename>} • hivelist {python volatility hivelist -f <filename> -o <offset value> • Hashdump {volatility hashdump -f <filename> (-y System Hive Offset)(-s SAM Hive Offset) • Use of CAIN & Abel to crack the hashes obtained.

  7. Extracting user assist keys from RAM • Load the image in Encase and search for the keyword HRZR_EHACNGU {which is “UEME_RUNPATH”}. Keywords are HRZR_EHACNGU.*[\.]rkr HRZR_EHACNGU.*[\.]yax • Decrypt the results using ROT13-decryptor.

  8. Advance Registry Forensic

  9. Windows Registry • Registry files are essentially databases containing information and settings for • Hardware • Software • Users • Preferences • A registry hive is a group of keys, subkeys, and values in the registry that has a set of supporting files containing backups of its data. • In Windows 98, the registry files are named User.dat and System.dat. • In Windows Millennium Edition, the registry files are named Classes.dat, User.dat, and System.dat. • In Win XP, the registry files are available in C:\windows\system32\config folder

  10. Mining Windows Registry • Multiple forensic avenues in the registry! • System and User-specific settings • UserAssist • MuiCache • MRU Lists • ProgramsCache • StreamMRU • Shellbags • Usbstor • IE passwords • and many more!

  11. Mining Windows Registry • Multiple forensic avenues in the registry! • System and User-specific settings- NTUSER.DAT • UserAssist - HKCU/software/microsoft/windows/currentversion/Explorer/UserAssist • MuiCache - HKCU/Software/Microsoft/Windows/ShellNoRoam/MUICache • MRU Lists - HKCU/software/microsoft/windows/currentversion/Explorer/RunMRU • ProgramsCache –HKCU/Software/Microsoft/Windows/CurrentVersion/Explorer/StartPage • StreamMRU - HKCU/software/microsoft/windows/currentversion/Explorer/StreamMRU • Shellbags – HKCU/Software/Microsoft/Windows/Shell/BagMRU • Usbstor - HKLM/System/CurrentControlSet/Enum/USBStor • and many more! • Demo

  12. Tools to analyze registry • Regripper {open source tool. Developed by Harlen Carvey. Coding is done in PERL language} • Windows registry analyzer • Windows registry recovery. • Timestamp Dcode.

  13. Network Forensic

  14. The Security Process and Network Forensics

  15. Overall approach • Study the network architecture. • Determine network traffic capture mechanisms at appropriate points and get a copy of the capture file. • Determine devices that should/could be generating logs, especially those that are pertinent to case in hand. • Determine vendors of these devices. • Determine logging functionality, and logging configuration. • Assemble appropriate log analysis tools, and objectives of the analysis • String searches • Pattern searches

  16. Tools for analyzing captured network traffic • Network Miner • Netwitness • Wireshark • Winhex

  17. Case study of Network Forensic

  18. Thank you! Questions and Answers!! Kush Wadhwa, EnCE, CEH, RHCE Contact Number : +919717188544 Email Address: - kushwadhwa@gmail.com

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