Overview
-- Update: July 29, 2009 --
BackDoor-DKI.dldr is now embedded on a crafted PDF file which is detected as Exploit-PDF.m. This backdoor Trojan is capable of logging the keystrokes of the compromised system. The information collected from a compromised computer may be sent to the attackers? server at periodical intervals.
-- Update: April 6, 2007 ---
The most recent variant of Backdoor-DKI.dldr is dropped by Exploit-TaroDrop Trojan, which exploits a zero-day vulnerability in Ichitaro Document Viewer.
The trojan "BackDoor-DKI.dldr" is designed to download "BackDoor-DKI" trojan.
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Minimum DAT
4921 (2006-12-18) Updated DAT6152 (2010-10-30) |
Minimum Engine
5.1.00 File LengthVaries |
Description Added
2006-12-18 Description Modified2009-07-29 |
Malware Proliferation
Characteristics
-- Update: July 29, 2009 --
This variant of the Trojan on execution copies itself to the %system% folder and deletes itself from the initial location. It also creates a log file with the same name in %system% folder to save the keystrokes of the infected computer.
Following files are created on execution:
- %system%\arteagent.exe
- %system%\arteagent (Keystroke log file)
Following registry entry is created:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\ {3DEDF8F4-59AB-5FD4-38F2-6D83EBAF8314}
?StubPath? = ?%system%\arteagent.exe?
(Where %system% is the default system directory for example C:\Windows\System, C:\windows\System32 etc)
This Trojan may steal the information from the infected machine by sending the saved keystroke log file (%system%\arteagent) to a remote host.
The Trojan establishes connection to the following host after resolving the DNS query
http://worldbank.[blocked].com
-- Update: April 6, 2007 ---
Upon execution, the trojan injects the code into the process of Internet Explorer. The code attempts to download BackDoor-DKI trojan from the following URL.
- http ://www.maritimesquare.com/[removed]/kz.exe (Detected with DAT 5003)
Symptoms
- Presence of the above mentioned files and registry entries.
- Presence of network activity between the infected machine and the remote host mentioned above.
Method of Infection
-- Update: July 29, 2009 ---
This backdoor Trojan is covertly dropped on opening the malicious PDF file (Exploit-PDF.m) on the vulnerable computers.
The malicious PDF file may be sent through the mail as an attachment.
-- Update: April 6, 2007 ---
It is observed to be dropped by Exploit-TaroDrop that exploits a vulnerability in Ichitaro Document Viewer.
Removal
All Users:
Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:
2.Update to current engine and DAT files for detection and removal.
3.Run a complete system scan.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
1. Please go to the Microsoft Recovery Console and restore a clean MBR.
On windows XP:
Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
On Windows Vista and 7:
Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
Variants