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The Internet threat alert status is currently normal. At present, no major epidemics or other serious incidents have been recorded by Kaspersky Lab’s monitoring service. Internet threat level: 1

Backdoor.Win32.Bredolab.bcp

Detected Nov 27 2009 05:07 GMT
Released Nov 27 2009 09:46 GMT
Published Mar 18 2011 13:19 GMT

Technical Details
Payload
Removal instructions

Technical Details

This malicious program provides a malicious user with remote access to the infected computer. It is a Windows application (PE EXE file). It is 39 424 bytes in size. It is written in C++.


Payload

Once launched, the Trojan decrypts and extracts the following file from its body to the current user's temporary directory:

%Temp%<rnd1>.tmp
where <rnd1> is a random set of numbers and letters.

This file is 26 625 bytes in size. It is detected by Kaspersky Anti-Virus as Trojan.Win32.Agent.eory.

Then, the Trojan loads the extracted file to its address space and launches the malicious code contained within it.


Removal instructions

If your computer does not have an antivirus, and is infected by this malicious program, follow the instructions below to delete it:

  1. Delete the original Trojan file (its location will depend on how the program originally penetrated the infected computer).
  2. Delete the following files:
    %Temp%\<rnd1>.tmp
    where <rnd1> is a random set of numbers and letters.
  3. Perform a full scan of the computer using Kaspersky Anti-Virus with up-to-date antivirus databases (download a trial version).


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Backdoor

Backdoors are designed to give malicious users remote control over an infected computer. In terms of functionality, Backdoors are similar to many administration systems designed and distributed by software developers.

These types of malicious programs make it possible to do anything the author wants on the infected computer: send and receive files, launch files or delete them, display messages, delete data, reboot the computer, etc.

The programs in this category are often used in order to unite a group of victim computers and form a botnet or zombie network. This gives malicious users centralized control over an army of infected computers which can then be used for criminal purposes.

There is also a group of Backdoors which are capable of spreading via networks and infecting other computers as Net-Worms do. The difference is that such Backdoors do not spread automatically (as Net-Worms do), but only upon a special “command” from the malicious user that controls them.


Other versions

Aliases

Backdoor.Win32.Bredolab.bcp (Kaspersky Lab) is also known as:

  • Trojan: W32/Koobface.worm.gen.v (McAfee)
  • Mal/Koobface-A (Sophos)
  • Trojan.Bredolab-512 (ClamAV)
  • Trj/Downloader.MDW (Panda)
  • Trojan:Win32/Oficla.E (MS(OneCare))
  • Trojan.Botnetlog.83 (DrWeb)
  • Win32/Oficla.BW trojan (Nod32)
  • Trojan.Generic.CJ.AFGA (BitDef7)
  • Backdoor.Bredolab.AIK (VirusBuster)
  • Win32:Malware-gen (AVAST)
  • Trojan.Win32.Bredolab (Ikarus)
  • BackDoor.Generic12.LPR (AVG)
  • BDS/Bredolab.bcp (AVIRA)
  • BACKDOOR.Trojan (NAV)
  • W32/Koobface.FHF (Norman)
  • Backdoor.Win32.Bredolab.bcp [AVP] (FSecure)
  • Worm.Win32.Koobface.Gen.3 (v) (Sunbelt)