Using LinEn
55
Mode Selection
LinEn starts up in BIOS mode. A disk acquired in this mode reports only disk size seen by the
BIOS. As a result, no data contained in a DCO are seen or reported. The Mode selection in LinEn
provides a solution.
Notice Disk1 in the figure. It shows a disk size of 26.8 GB. If this is acquired now, only that
quantity of data is identified.
The Linux distribution in use must support Direct ATA mode for this function to work.
To test for the presence of a DCO,
1.
Start LinEn in the normal manner on a computer that supports Direct ATA. The main
screen shows a Mode button.
2.
Enter ʹMʹ to select Mode. A second screen displays offering three acquisition selections:
BIOS
ATA
Cancel
3.
Enter ʹAʹ to select ATA Mode.
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EnCase Forensic Version 6.11 Userʹs Guide
If a DCO is present on the disk, the original LinEn screen reports the correct disk size and
the correct number of sectors. Disk1 in the following illustration shows the true disk size,
75.5 GB.
Acquire the disk according to protocol.
Doing a Crossover Cable Preview or Acquisition
You have a LinEn boot disk.
The investigator has identified the subject drive to be acquired.
To do a crossover cable acquisition
1.
Boot the subject machine from the LinEn boot disk.
2.
Connect the forensic machine to the subject machine using a crossover cable.
3.
In Linux, ensure that the subject machine has an IP address assigned and a NIC card
loaded appropriately by typing
ifconfig eth0
, then if no IP address is assigned,
assign one by typing
ifconfig eth0 10.0.0.1 netmask 255.0.0.0
, and check
the IP address assignment again by typing
ifconfig eth0
.
4.
Navigate to the folder where LinEn resides and type ./linen in the console to run LinEn.
The LinEn Main Screen displays.
Using LinEn
57
5.
Select Server, and press Enter.
The message Waiting to connect should display.
6.
Specify an IP address of 10.0.0.1 on the forensic machine for the subject machine.
7.
Launch the EnCase application on the forensic machine.
8.
Create a new case, or open an existing case.
9.
Right‐click on the
Devices object, and click
Add Device.
10.
Select Network Crossover, and click Next.
11.
Select the physical disk or logical partition to acquire or preview and click Next.
12.
Click Finish.
The contents of the selected device reached through the network crossover connection are
previewed. To acquire the content, perform an acquisition as described in Specifying and
Running an Acquisition
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EnCase Forensic Version 6.11 Userʹs Guide
Hashing the Subject Drive Using LinEn
This allows the investigator to know the hash value of the drive.
LinEn is configured as described in the setup topics, and autofs is disabled.
The investigator has identified the subject drive to be hashed.
To perform a hash using LinEn
1.
Navigate to the folder where LinEn resides and type ./linen in the console.
The LinEn Main Screen displays.
2.
Select Hash.
The Hash dialog displays.
3.
Select a drive, and click
OK.
The Start Sector dialog displays.
4.
Accept the default or enter the desired Start Sector, and click OK.
The Stop Sector dialog displays.
5.
Accept the default or enter the desired
Stop Sector, and click
OK.
The (Hash Results) dialog displays.
6.
If you want the hash result to be written to a file, click Yes.
If you are saving the hash value to a file, the Save Hash Value to a File dialog displays;
otherwise, the LinEn Main Screen displays.
7.
Enter the path and filename of the file that will contain the hash value, and click OK.
The hash value is saved, and the LinEn Main Screen displays.
A hash value is calculated for the selected sectors of the selected file. You can save this hash
value to a file.
In This Chapter
The Main Window
60
Panes and their Specific Tabs
98
Navigating the Tree Pane
115
Modifying the Table Pane
122
Modifying the View Pane
148
CHAPTER 5
Navigating the EnCase
Interface