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Ch a p t e r 5 - D o n g l e A c t i v a t i o n

41 | Page

The Wibu CodeMeter Network Server can also be configured using the

following registry setting:

HKEY_LOCAL_MACHINE\SOFTWARE\WIBU-

SYSTEMS\CodeMeter\Server\CurrentVersion

IsNetworkServer=1

On the client computer:

Install Forensic Explorer full dongle version. Close Forensic Explorer.

Browse to http://localhost:22350/Configuration.html:

Figure 25, Wibu CodeMeter Local Host Configuration

Click the add button and add the IP address of Network Server and press

Apply.

10.

Start Forensic Explorer. It should detect the remote dongle license and

activate.

The client computer can also be configured using the following registry key

setting:

HKEY_LOCAL_MACHINE\SOFTWARE\WIBU-

SYSTEMS\CodeMeter\Server\CurrentVersion\ServerSearchList\Server1

Address=192.168.100.10

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Ch a p t e r 5 - D o n g l e A c t i v a t i o n

5.3

APPLYING MAINTENANCE UPDATES TO YOUR WIBU DONGLE

Once a maintenance update has been purchased, to update maintenance on your

Wibu dongle:

On a computer which has internet access, insert your Wibu dongle into a

USB port. Remove any other Wibu dongles that you may have for other

products.

Run the GetData License Manager located in the installation folder of

Forensic Explorer. The default location is: C:\Program Files\GetData\Forensic

Explorer vx\License Manager.exe

The GetData License Manager will detect your Wibu dongle, as shown in

Figure 26 below. The existing Maintenance expiration date is displayed in the

Maintenance column:

Figure 26, GetData License Manager

Select “Forensic Explorer” from the product list and press the ADD button.

In the Add Licenses window, enter the ͞License͟ key that you received with

your renewal order. Press the Search key.

Select the renewal from the available product list. Then click the Apply

button.

Return to the main screen of the License Manager. Click the refresh button to

display the new maintenance date.

For further assistance in applying maintenance updates to your Forensic Explorer

dongle, please contact support@getdata.com (see Appendix 1 - Technical Support for

full contact details).

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Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

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Chapter 6 - Forensic Acquisition

In This Chapter

CHAPTER 6

- FORENSIC ACQUISITION

6.1

Write block ........................................................................................................................................ 44

6.2

GetData͛s Forensic Imager ................................................................................................................ 45

6.2.1

Installation ........................................................................................................................... 45

6.2.2

System Requirements .......................................................................................................... 45

6.2.3

Protected Disk Areas - HPA and DCO ................................................................................... 45

6.2.4

Running Forensic Imager ..................................................................................................... 46

6.2.5

1. Selecting the source ......................................................................................................... 47

6.2.6

2. Selecting the destination ................................................................................................. 48

6.2.7

3. Progress ........................................................................................................................... 53

6.2.8

4. Log file .............................................................................................................................. 53

6.2.9

Bad Sectors and error reporting .......................................................................................... 54

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Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

6.1

WRITE BLOCK

IMPORTANT:

An accepted principal of computer forensics is that, wherever possible, source data to

be analyzed in an investigation should not be altered by the investigator.

If physical media such as a hard drive, usb drive, camera card etc. is a potential source

of evidence, it is recommended that when the storage media is connected to a

forensics workstation it is done so using a Forensic write block device.

A Forensic write blocker is usually a physical hardware device (a write blocker) which

sits between the target media and the investigators workstation. It ensures that it is

not possible for the investigator to inadvertently change the content of the examined

device.

There are a wide variety of forensic write blocking devices commercially available.

Investigators are encouraged to become familiar with their selected device, its

capabilities and its limitations.

Shown in Figure 27 below is a Tableau USB hardware write block. The source media,

an 8 GB Kingston USB drive is attached and ready for acquisition:

Figure 27, Tableau USB write block with USB as the source drive

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45 | Page

6.2

GETDATA’S FORENSI IMAGER

Installed with Forensic Explorer is the standalone forensic imaging tool ͞Forensic

Imager͟. Forensic Imager is a Windows based program that will acquire a forensic

image into one of the following common forensic file formats (described in more detail

later in this chapter):



DD /RAW (Linux ͞Disk Dump͟)



AFF (Advanced Forensic Format)



E01 (EnCase®) [Version 6 format]

6.2.1

INSTALLATION

Forensic Imager is installed with Forensic Explorer into its installation folder:

C:\Program Files\GetData\Forensic Explorer v1\ForensicImager.exe

6.2.2

SYSTEM REQUIREMENTS

Forensic Imager should be run as local Administrator to ensure that sufficient access

rights are available for access to devices.

Forensic Imager requires the following minimum specification:



Windows 7 or above;



32 and 64bit compatible;



Pentium IV 1.4 GHz or faster processor;



1GB RAM.

Forensic Imager does NOT support DOS acquisition. If acquisition from a DOS boot disk

is required alternative forensic acquisition software should be used.

6.2.3

PROTECTED DISK AREAS - HPA AND DCO

Host Protected Area (HPA) and Device Configuration Overlay (DCO)

The HPA and DCO are two areas of a hard drive that are not normally visible to an

operating system or an end user. The HPA is most commonly used by booting and

diagnostic utilities. For example, some computer manufacturer͛s use the area to

contain a preloaded OS for install and recovery purposes. The D O ͞allows system

vendors to purchase HDDs from different manufacturers with potentially different

sizes, and then configure all HDDs to have the same number of sectors. An example of

this would be using DCO to make an 80 Gigabyte HDD appear as a 60 Gigabyte HDD to

both the OS and the BIOS͟ (1)

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Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

Whilst the HPA and DCO are hidden, it is technically possible for a user to access these

areas and store/hide data. Forensic Imager does not currently support the acquisition

of HPA or DCO areas.

6.2.4

RUNNING FORENSIC IMAGER

Forensic Imager is located in the Forensic Explorer installation folder as a stand-alone

executable. When Forensic Imager is run the investigator is presented with 3 options:

Acquire:

The acquire option is used to take a forensic image (an exact copy) of

the target media into an image file on the investigators workstation;

Convert:

The convert option is used to copy an existing image file from one

image format to another, e.g. DD to E01;

Hash or verify The hash or verify option is used to calculate a hash value for a

device or an existing image file.

As shown in Figure 28, Forensic Imager below:

Figure 28, Forensic Imager

When ͞Acquire͟ or ͞ onvert͟ is selected, the subsequent work flow is:

Select source;

Select destination options;

Create the image;

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Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

47 | Page

Display and save event log.

When ͞Hash or Verify͟ is selected, the subsequent work flow is:

Select source;

Verify;

Display and save event log.

The workflow is discussed in more detail below:

6.2.5

1. SELECTING THE SOURCE

When the ͞Acquire͟, ͞ onvert͟ or ͞Hash or Verify͟ button is selected, the source

selection screen is displayed enabling selection of the source media:



When ͞Acquire͟ is selected, the source window shows the available physical

devices (hard drives, USB drives, camera cards, etc.) and logical devices

(partitions or volumes on the physical devices, e.g. "C:" drive) attached to the

forensic workstation.



When ͞Convert͟ is selected, the source window allows the selection of the

source image file. Click the ͞Add Image͟ button to add the required image file

to the selection list.



When the ͞Hash or Verify͟ button is selected, the source window allows the

selection of either a physical or logical drive, or an image file.

Figure 29, Forensic Imager - selecting the source device (Hash or Verify option shown)

The device selection window includes the following information:

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Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

Label: Physical drives are listed with their Windows device number.

Logical drives display the drive label (if no label is present then "{no

label}" is used). Image files show the path to the image.

Size:

The size column contains the size of the physical or logical device,

or the size of the image file.

(Note that the reported size of a drive is usually smaller than the

size printed on the drive label. This is because manufactures report

the size in a decimal number of bytes while the Operating System

reports the size in 1,024 chunks for each KB).

FS:

The File System on the drive, e.g. FAT, NTFS or HFS;

Type:

Describes the way in which the drive is connected to the computer.

An image file will show the type of image (e.g. EnCase® or RAW).

Acquisition of physical vs. logical device

In most situations, pending compliance with any overriding case specific legal

requirements, an investigator is most likely to select an image a physical device.

Imaging the physical device gives access to the content of the entire media, for

example, the space between partitions. Carrier, 2005, observes: ͞The rule of thumb is

to acquire data at the lowest layer that we think there will be evidence. For most cases,

an investigator will acquire every sector of a disk͟. (2 p. 48)

In specific circumstances, an investigator may need to acquire a range of sectors from

the device. In this case, start and end sector information in entered in the sector range

fields at the bottom of the source selection window.

To select the source:

Highlight the required device or image file using the mouse;

lick the ͞Next͟ button is clicked to proceed to the destination window.

6.2.6

2. SELECTING THE DESTINATION

The image destination screen, shown in Figure 30 below, is where the parameters for

the image file are set, including type, compression, name, location etc.

Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

49 | Page

Figure 30, Setting destination options

1. SOURCE

The source field shows the device or image file selected in the previous window. This

source field cannot be edited here. Select the back button if a change to the source is

required.

2. IMAGE TYPE

The investigator has the choice of creating the forensic image in one of the following

forensic file formats:

DD / RAW:

The DD / RAW format originate from the UNIX command line environment. A DD

/RAW image is created from blocks of data read from the input source and written

directly into the image file. The simplicity of a DD image makes it possible to compare

the imaged data to the source, but the format lacks some of the features found in

more modern formats, including error correction and compression.

Advanced Forensic Format (AFF):

AFF is ͞an extensible open format for the storage of disk images and related forensic

metadata. It was developed by Simson Garfinkel and asis Technology͟. (3). Refer to

http://afflib.org/ for further information.

EnCase®.E01

The EnCase® E01 evidence file format was created by Guidance Software Inc. It is

widely accepted in the forensic community as the image file standard. Further

50 | Page

Ch a p t e r 6 - F o r e n s i c A c q u i s i t i o n

information is available at www.guidancesoftware.com. The structure of the

EnCase®.E01 format allows for case and validation information (CRC and MD5) to be

stored within the image file. The structure of the EnCase® file format is shown below:

Source: (4)

3. FILE SEGMENT SIZE

Sets the segment size of the created forensic image file:

This setting enables the forensic image file to be broken into segments of a specific

size. Setting an image segment size is primarily used when the forensic image files will

later be stored on fixed length media such as CD or DVD.

For the EnCase®.E01 image format, Forensic Imager uses the EnCase® v6 standard and

is not limited to a 2 GB segment size. However, if an investigator plans to use larger

file segments they should give consideration to the limitations (RAM etc.) of the

systems on which the image files will be processed.

4. OUTPUT FILENAME

Sets the destination path and file name for the image file:

The output file name is the name of the forensic image file that will be written to the

investigators forensic workstation. Click on the folder icon to browse for the

destination folder.

5. HASH OPTIONS

Calculates an MD5 and/or SHA256 acquisition hash of the imaged data:

A hash value is a mathematical calculation that is used for identification, verification,

and authentication of file data. A hash calculated by Forensic Imager during the

acquisition of a device (the ͞acquisition hash͟) enables the investigator, by

recalculating the hash at a later time (the ͞verification hash͟), to confirm the

authenticity of the image file, i.e. that the file has not changed. Any change to the

acquired image will result in a change to the hash value.

Data

Block

Data

Block

Header:

Case

Information

Header CRC

Figure 31, EnCase® header

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