RDN/Generic BackDoor!qn!E3AF3D748​7B1

This page shows details and results of our analysis on the malware RDN/Generic BackDoor!qn!E3AF3D7487B1

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 e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.


Minimum DAT

7109 (2013-06-17)

Updated DAT

7109 (2013-06-17)

Minimum Engine

5400.1158

File Length

48640

Description Added

2013-06-17

Description Modified

2013-06-17

Malware Proliferation

Characteristics

This is a Trojan

File PropertiesProperty Values
McAfee DetectionRDN/Generic BackDoor!qn
Length48640 bytes
MD5e3af3d7487b18b30a9f6716fca58ae58
SHA1560502ebec6e09a1d049c686ade3903e8d83b8ac


Other Common Detection Aliases

Company NamesDetection Names
ahnlabBackdoor/Win32.PcClient
avastWin32:MalInject
AVG (GriSoft)BackDoor.Generic13.ABTI
aviraTR/Dropper.Gen
KasperskyBackdoor.Win32.PcClient.fedy
BitDefenderTrojan.Generic.KDV.105277
clamavWin.Trojan.Pcclient-1452
Dr.WebBackDoor.PcClient.5380
F-ProtW32/PcClient.AF.gen!Eldorado
FortiNetW32/PcClient.NGZ!tr
Microsofttrojan:win32/meredrop
SymantecSuspicious.IRCBot
EsetWin32/PcClient.NGZ
normandoslegacy/PCClient.ZFF
risingBackdoor.PcClient!47FD
vba32Backdoor.Pcclient
Vet (Computer Associates)Win32/FraudPack.F!generic

Other brands and names may be claimed as the property of others.


ActivitiesRisk Levels
Enumerates many system files and directories.Low
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaRDN/Generic BackDoor!qn
McAfee SupportedRDN/Generic BackDoor!qn



System Changes

Some path values have been replaced with environment variables as the exact location may vary with different configurations.
e.g.
%WINDIR% = \WINDOWS (Windows 9x/ME/XP/Vista/7), \WINNT (Windows NT/2000)
%PROGRAMFILES% = \Program Files


The following files were analyzed:

ayydzb.exe

The following files have been added to the system:

  • %COMMONPROGRAMFILES%\Microsoft Shared\ayydzb.dll

The following files were temporarily written to disk then later removed:

  • %TEMP%\ayydzbreg.reg
  • %TEMP%\560502EBEC6E09A1D049C686ADE3903E8D83B8AC
  • %TEMP%\ayydzbreg.dll
  • %TEMP%\ayydzb.dll

The following registry elements have been created:

  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\COMSYSAPP\

The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\COMSYSAPP\IMAGEPATH = %COMMONPROGRAMFILES%\Microsoft Shared\ayydzb.exe comsysapp
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\COMSYSAPP\START = 2
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\COMSYSAPP\TYPE = 272

The applications attempted the following network connection(s):

  • [private subnet]:800

Symptoms

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, 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