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Migden / Digital-Forensics

A repo designed for notes from the Digital Forensics Topic in TAFE Advanced Diploma
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Windows Forensics.md #2

Open Migden opened 3 months ago

Migden commented 3 months ago

Windows Registry Forensics

What is the Windows Registry?

The Windows registry is a collection of databases that contains system configuration data. This could include hardware, software or user configuration information.

Furthermore, it can contain data about recently used files, programs run, or devices connected to the system.

This is vital to a forensics investigation standpoint.

Structure of the Registry

Currently Windows System Contains the following 5 Root keys:

  1. HKEY_CURRENT_USER
  2. HKEY_USERS
  3. HKEY_LOCAL_MACHINE
  4. HKEY_CLASSES_ROOT
  5. HKEY_CURRENT_CONFIG

To view these you can open regedit.exe

HKEY_CURRENT_USER

Contains the root configuration information for the user who is currently logged on.

HKEY_USERS

Contains all the actively loaded user profiles on the computer

HKEY_LOCAL_MACHINE

Contains configuration information particular to the computer

HKEY_CLASSES_ROOT

Provides a view of the registry that merges information from HKEY_CURRENT_USER and HKEY_LOCAL_MACHINE

HKEY_CURRENT_CONFIG

Contains information about the hardware profile that is used by the local computer

Structure

The registry contains two basic elements: keys and values. Registry keys are container objects similar to folders. Registry values are non-container objects similar to files.

Keys may contain values and subkeys.

E.g. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows refers to the subkey "Windows" of the subkey "Microsoft" of the subkey "Software" of the HKEY_LOCAL_MACHINE root key.

Windows Registry Hives

A hive is a logical group of keys, subkeys, and values in the registry that is a set of supporting files loaded into memory when the operating system is started or a user logs in.

If you are accessing a live system, you will be able to access the registry using regedit.exe. However, if you only have access to a disk image, you must know where the registry hives are located. The majority are stored in C:\Windows\System32\Config

Hives containing User Information

Apart from hives located in C:\Windows\System32\Config, to hives containing user information can be found in the user profile directory. The hives are;

These are hidden files that store information about the user that is ran when the user logs in or a specific action is conducted

The Amcache Hive

Apart from the above files, there is another very important hive called the AmCache hive. It is located in C:\Windows\AppCompat\Programs\Amcache.hve. Window creates this hive to save information on program that were recently run on the system

Data Acquisition

When preforming forensics, we will either encounter a live system or an image taken of the system. Though we can view the registry through the registry editor, the forensically correct method is to acquire a copy of this data and preform analysis on the copy. However, when we go to copy the registry hives we can't because it is restricted.

Programs for acquiring these files are:

Exploring Windows Registry

Once we have extracted the registry hives, we need a tool to view these files as we would in the registry editor. Since the registry editor only works with live systems.

The following are tools that can be used to analyse registry hives:

Recent Files

Windows maintains a list of recently opened files for each user. As we might have seen when using Windows expklorer, it shows us a list of recently used files.

This information is stored in the NTUSER hive and can be found at the location NTUSED.DATA\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs

Office Recent FIles

Similar to the recent docs maintained by windows explorer, Microsoft Office also maintains a list of recently opened documents. This list is also in the NTUSER hive. It can be found in the following location NTUSER.DAT\Software\Microsoft\Office\{VERSION}

Shellbags

When any user opens a folder, it opens in a specific layout. Users can change this layout according to their preferences. These layouts can be different for different folders. This information is stored in the following locations:

User Assist

Windows keeps log of applications that have been ran on the system, as well as statistical data regarding these applications. However There is multiple different hives that provide different pros and cons regarding program execution logging.

UserAssist

Present in the NTUSER.DAT\Software\Microsoft\Windows\Currentversion\Explorere\UserAssist\{GUID}\Count. GUID standing for Global Unique Identifier.

While UserAssist provides execution information, any program run via the command line cannot be viewed

AmCache

Includes execution path. installation, execution and deletion times, and SHA1 hashes of the executed programs. It is located at C:\Windows\appcompat\Programs\Amcache.hve

BAM/DAM

Background Activity Monitor or BAM keeps tabs on the activity of background applications. Similar Desktop Activity Moderator or DAM, is part of Microsoft Windows that is responsible for optimizing power consuption.

They are located in the:

External Devices/USB decive Forensics

When preforming forensics on a machine, often the need will arise to identify if any USB or removable drives were attached to the machine.

Device Identification

The following locations keep track of USB keys plugged into a system;

User files location

The directory C:\Documents and Settings holds the information on users created in the Windows system such as files and settings.

This is handy when analysing file system dumps to view user information

Migden commented 3 months ago

Cheatsheet for Windows Registry Forensics

Windows Forensics Cheatsheet.pdf