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Overview

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Aliases

• Backdoor.Trojan (Symantec)

• TROJ_DLOAD.MY (TrendMicro)

Characteristics

Upon execution this backdoor trojan creates a copy of itself in

%SystemDir%\startup\svchost.exe

(Where %SystemDir% is the  Windows system folder, e.g. C:\Windows\System32)

It then connects to port 80 of the following sites to send information and receive commands:

• win.great[blocked].com
• xp.offices[blocked].com
• logon.pt[blocked].com

Additional malware components detected as BackDoor-DUK are then downloaded and copied into:

• %Windir%\addins\taskgm.exe
• %Windir%\addins\yy.exe

(where %WinDir% is the default Windows directory, for example C:\WINNT, C:\WINDOWS etc.)

The following registry keys are added which starts the trojan at every system startup:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Common Startup = "C:\WINDOWS\system32\startup"
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Common Startup = "%SystemDir%\startup"

(Where %SystemDir% is the  Windows system folder, e.g. C:\Windows\System32)

And the following default registry keys are removed:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Common Startup: "%ALLUSERSPROFILE%\Start Menu\Programs\Startup"
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Common Startup  : "%ALLUSERSPROFILE%\Start Menu\Programs\Startup"

The backdoor has the following functions:

• gather system  information
• list files/directories
• upload/download files
• provide remote shell (cmd.exe)
• log keystrokes

Symptoms

• Unexpected HTTP request to the mentioned domain(s).
• Presence of the files and registry mentioned above.

Method of Infection

• Trojans do not self-replicate. They spread manually, often under the premise that the executable is something beneficial.
• Trojans may also be received as a result of poor security practices, or un-patched machines and vulnerable systems.
• Distribution channels include IRC, peer-to-peer networks, email, newsgroups postings, etc.

Removal

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

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

Variants

N/A

All Information

Overview -

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Aliases

• Backdoor.Trojan (Symantec)

• TROJ_DLOAD.MY (TrendMicro)

Characteristics

Characteristics -

Upon execution this backdoor trojan creates a copy of itself in

%SystemDir%\startup\svchost.exe

(Where %SystemDir% is the  Windows system folder, e.g. C:\Windows\System32)

It then connects to port 80 of the following sites to send information and receive commands:

• win.great[blocked].com
• xp.offices[blocked].com
• logon.pt[blocked].com

Additional malware components detected as BackDoor-DUK are then downloaded and copied into:

• %Windir%\addins\taskgm.exe
• %Windir%\addins\yy.exe

(where %WinDir% is the default Windows directory, for example C:\WINNT, C:\WINDOWS etc.)

The following registry keys are added which starts the trojan at every system startup:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Common Startup = "C:\WINDOWS\system32\startup"
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Common Startup = "%SystemDir%\startup"

(Where %SystemDir% is the  Windows system folder, e.g. C:\Windows\System32)

And the following default registry keys are removed:

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Common Startup: "%ALLUSERSPROFILE%\Start Menu\Programs\Startup"
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Common Startup  : "%ALLUSERSPROFILE%\Start Menu\Programs\Startup"

The backdoor has the following functions:

• gather system  information
• list files/directories
• upload/download files
• provide remote shell (cmd.exe)
• log keystrokes

Symptoms

Symptoms -

• Unexpected HTTP request to the mentioned domain(s).
• Presence of the files and registry mentioned above.

Method of Infection

Method of Infection -

• Trojans do not self-replicate. They spread manually, often under the premise that the executable is something beneficial.
• Trojans may also be received as a result of poor security practices, or un-patched machines and vulnerable systems.
• Distribution channels include IRC, peer-to-peer networks, email, newsgroups postings, etc.

Removal -

Removal -

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

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

Variants -

N/A