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Trojan.VB.AE

First posted on 21 November 2011.
Source: BitDefender

Aliases :

There are no other names known for Trojan.VB.AE.

Explanation :

Trojan.VB.Ae was written in Visual Basic 6.0. The virus has a single window (witch it hides by moving it outside the screen coordinates).

Once executed, the virus will do the following:

Will display a message box that looks like an error message from Windows. There are 4 possible error messages that the virus can show :

a) File not found

b) Windll.dll missing

c) Unknown format

d) Error opening file , Winpaint.dll missing



The virus then waits until the user presses “Ok” button from the message box



It start recursively , searching for files with following extension (*.exe , *.mp3 , *.avi , *.jpg) and does the following actions :

a) if the target file is an executable file (*.exe) , it copies itself to the same location as the target file , with a similar name ( with is created by adding a random letter in from of the target file name E.g. for file write.exe , possible names are Wwrite.exe , hwrite.exe , etc ).

b) if the target file is not an executable , it copies itself to the same location as the target file , with a similar name ( by adding extension “.exe” to the end of the file E.g. for mypicture.jpg , the virus will create a copy of itself with the name mypicture.jpg.exe )

After this action , the remains inactive in memory ( it appears in Task Manager both in “Processes list” and “Application list”

The virus identifies itself after the size and it never overwrite itself.

Last update 21 November 2011

 

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