Virus Profile: Bredolab.gen

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 7/25/2009
Date Added: 7/25/2009
Origin: N/A
Length: N/A
Type: Trojan
Subtype: Generic
DAT Required: 5688
Removal Instructions


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.

Indication of Infection

* The Trojan is running in the process list.
* Presence of files and registry entries mentioned
* Network activities

Methods of Infection

Trojans are not viruses, and as such do not contain any method to replicate by themselves. However they may be downloaded by other viruses and/or Trojans to be installed on the user's system. Alternatively they may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the malwares).


Backdoor.Win32.Bredolab.ou(Kaspersky), TROJ_BREDOLAB.J(TrendMicro), Trojan-Downloader.Win32.Bredolab(Ikarus), Trojan-Downloader:W32/Bredolab.ED(F-Secure), TrojanDropper:Win32/Oficla.A(Microsoft)

Virus Characteristics

Upon execution Bredolab attempts to inject into svchost.exe processes and deletes the parent file. The Trojan then connects to the following domains,,, to download malwares such as Anti-spyware, Password stealers etc and executes it. The malware that is downloaded and related files may vary from one variant to another. Following are the possible locations and files created:

 c:\Program Files\PC_Antispyware2010\AVEngn.dll
 c:\Program Files\PC_Antispyware2010\htmlayout.dll
 c:\Program Files\PC_Antispyware2010\PC_Antispyware2010.exe
 c:\Program Files\PC_Antispyware2010\pthreadVC2.dll
 c:\Program Files\PC_Antispyware2010\Uninstall.exe
 c:\Program Files\PC_Antispyware2010\Microsoft.VC80.CRT\msvcm80.dll
 c:\Program Files\PC_Antispyware2010\Microsoft.VC80.CRT\msvcp80.dll
 c:\Program Files\PC_Antispyware2010\Microsoft.VC80.CRT\msvcr80.dll

Where %System%\ = C:\WINDOWS\system32

The following registry entries were made by Bredolab.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon "Userinit"
%System%\userinit.exe, %System%\sdra64.exe  
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "braviax"
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "braviax"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "PC Antispyware 2010"
C:\Program Files\PC_Antispyware2010\PC_Antispyware2010.exe /hide
HKEY_CURRENT_USER\Software\Microsoft\Security Center "AntiVirusDisableNotify" = "1"

HKEY_CURRENT_USER\Software\Microsoft\Security Center "FirewallDisableNotify" = "1"

HKEY_CURRENT_USER\Software\Microsoft\Security Center "UpdatesDisableNotify" = "1"



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.


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