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Windows 7: Trojan-Downloader.Win32.VB.bbl

30 Sep 2009   #1
Hakon

Windows 7 build 7600 64 bit
 
 
Trojan-Downloader.Win32.VB.bbl

I found this awesome virus "Trojan-Downloader.Win32.VB.bbl" and analyzed its behaviour in a VirtualBox and quickly found a weaknes
It is very hard to remove, it closes antivirus setups and then deletes them, closes all windows containg anything about antivirus tools (even if you google anything about it, it closes your browser)... AND it starts up in safemode too!
This post is only to ask for your opinion, a little bat file i created to remove it (and it works!).

Code:
@echo off
setlocal enabledelayedexpansion
set counter=1
cd %windir%\system32
if not exist "%windir%\system32\wins.exe" goto nothing:
:y
:yes

goto start
:counter

set /a counter=!counter!+1

:start
cls
echo Try %counter%
echo Killing processes...
start /MIN cmd.exe /c taskkill /im wins.exe /f
echo STOP!! please wait 5 seconds atleast before pressing any key && pause
taskkill /im lechuck.exe /f /t

echo Deleting files...
start /MIN cmd.exe /c del %windir%\system32\wins.exe /f /a
start /MIN cmd.exe /c del %windir%\system32\lechuck.exe /f /a
start /MIN cmd.exe /c del %windir%\system32\lechuck.hta /f /a
start /MIN cmd.exe /c del %windir%\system32\cmd.com /f /a
start /MIN cmd.exe /c del %windir%\regedit.com /f /a
start /MIN cmd.exe /c del %windir%\spolis.exe /f /a
start /MIN cmd.exe /c del %systemdrive%\p2p.exe /f /a
start /MIN cmd.exe /c del %systemdrive%\autorun.inf /a /f 

echo Fixing registry...
start /MIN cmd.exe /c reg add HKCR\exefile\shell\open\command /ve /t REG_SZ /d """"%%1""" %%*" /f
start /MIN cmd.exe /c reg add HKEY_CLASSES_ROOT\exefile\shell\open\command /ve /t REG_SZ /d """"%%1""" %%*" /f
start /MIN cmd.exe /c reg add HKEY_CLASSES_ROOT\batfile\shell\open\command /ve /t REG_SZ /d """"%%1""" %%*" /f
start /MIN cmd.exe /c reg add HKEY_CLASSES_ROOT\comfile\shell\open\command /ve /t REG_SZ /d """"%%1""" %%*" /f
start /MIN cmd.exe /c reg add HKEY_CLASSES_ROOT\cmdfile\shell\open\command /ve /t REG_SZ /d """"%%1""" %%*" /f
start /MIN cmd.exe /c reg add HKEY_CLASSES_ROOT\piffile\shell\open\command /ve /t REG_SZ /d """"%%1""" %%*" /f
start /MIN cmd.exe /c reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2 /f

echo Enabling Task Manager and Regedit again...
start /MIN cmd.exe /c Reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /f
start /MIN cmd.exe /c Reg Delete HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /f
start /MIN cmd.exe /c Reg Delete HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system /v DisableTaskMgr /f

if %counter%==5 goto fail
if exist %windir%\system32\wins.exe goto counter
if not exist %windir%\system32\wins.exe goto done

:done
echo Done!
pause
exit

:nothing
echo You are not infected by LeChucK.exe
set /p choice=Would you like to clean the system anyways (Y/N)?
goto %choice%

:fail
echo Failed to remove LeChucK.exe 5 times, contact tech support :[
pause

:n
:no
exit
Edit:
I have the virus if anyone is interested in testing, but im not sure how...upload it or sumthing?


My System SpecsSystem Spec
.
30 Sep 2009   #2
kirov

Windows XP
 
 

upload it in an encrypted archive in an encrypted archive in an encrypted archive that each have different 31 character hex-decimal passwords that you provide

that should provide the rest of us enough protection
btw, what malicious activities does this virus conduct?
My System SpecsSystem Spec
01 Oct 2009   #3
Hakon

Windows 7 build 7600 64 bit
 
 

Its supposed to download more malware! but i havent seen any of that yet...
My System SpecsSystem Spec
.

01 Oct 2009   #4
kirov

Windows XP
 
 

can you upload it? I'm interested in testing
My System SpecsSystem Spec
01 Oct 2009   #5
Airbot

Windows 7 Ultimate x64 SP1
 
 

warning   Warning
No uploading or posting any malicious content on this site, period. And don't ask for it to be uploaded either. Failure to listen to this warning will result in a ban.
My System SpecsSystem Spec
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