Question

How to stop the spread of conficker

Asked by: kiano

Hi experts

We have the conficker worm spreading through our network like wild fire and it is locking accounts constantly on our DC's.  It is highly unlikely we will be able to take the network down to clean all infected machines or disable file and print sharing as it is a corporate network.  All machines are patched and have Sophos AV installed.  The virus is being quarantined and the accounts are being unlocked automatically to keep the users having access to shared resources.  How do we determine the source and stop the spread to give us time at cleaning network clients, local and remote?

All help sincerely appreciated.

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Asked On
2009-02-26 at 03:04:56ID24179456
Tags

Sophos Conficker AD Spread

Topic

Anti-Virus

Participating Experts
1
Points
500
Comments
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Answers

 

by: xmachinePosted on 2009-02-26 at 07:09:10ID: 23745423

Hi,

You came to the right place, you are not alone in this.

1) To start working, first you need to download the required patches + fix tool:

Windows 2000: http://download.microsoft.com/download/4/a/3/4a36c1ea-7555-4a88-98ac-b0909cc83c18/Windows2000-KB958644-x86-ENU.EXE

Windows 2003: http://download.microsoft.com/download/e/e/3/ee322649-7f38-4553-a26b-a2ac40a0b205/WindowsServer2003-KB958644-x86-ENU.exe

Windows XP: http://download.microsoft.com/download/4/f/a/4fabe08e-5358-418b-81dd-d5038730b324/WindowsXP-KB958644-x86-ENU.exe

Windows Vista SP0 + SP1: http://download.microsoft.com/download/d/c/0/dc047ab9-53f8-481c-8c46-528b7f493fc1/Windows6.0-KB958644-x86.msu

Symantec FixDownadupTool: http://www.symantec.com/content/en/us/global/removal_tool/threat_writeups/FixDownadup.exe

2) Create a shared folder on some server to contain the downloaded files (Apply Read-only permission for all users).

3) And you can use Psexec (http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx) to import a text file that contains the infected machines and run it using a privileged account like a Windows domain admin.

4) In the batch file, you should replace the server name and shared folder name.

so, for example (run this as domain administrator):

c:\psexec @infected.txt -d -c Clean-Downadup.bat

infected.txt should contains one name/ip per line, like:

...
192.168.1.2
192.168.1.3
192.168.1.4
...

Use netscan to ping a range of IP's and save the results as a text file (http://www.softperfect.com/products/networkscanner/)

Another important points:

1)  Review the current Passwords policy, you can configure a Windows GPO that will require a complex password, with a minimum number of characters.


2) Use Nessus (http://www.nessus.org/download/), and scan all machines using this plugin ID (34476) to check if they have MS08-067 patch installed or not. (BTW, you can use a different tool to check for the installed patch, but this just an example)
 

A Symantec Certified Specialist @ your service

@echo off
color 0A
ECHO. ***********************************************************************************************
ECHO.                ExtremeSecurity.blogspot.com - Do It Securely or Not At All 
ECHO.                                Multi OS W32.Downadup Cleaner 
ECHO. ***********************************************************************************************
 
 
ver | find "2003" > nul
if %ERRORLEVEL% == 0 goto ver_2003
 
ver | find "XP" > nul
if %ERRORLEVEL% == 0 goto ver_xp
 
ver | find "2000" > nul
if %ERRORLEVEL% == 0 goto ver_2000
 
ver | find "Version 6.0.6000" > nul
if %ERRORLEVEL% == 0 goto ver_vista-sp0
 
ver | find "Version 6.0.6001" > nul
if %ERRORLEVEL% == 0 goto ver_vista-sp1
 
 
goto exit
 
:ver_2003
echo Enabling BITs ...
sc config bits start= auto
echo Starting BITs ...
net start "Background Intelligent Transfer Service"
echo Enabling Automatic Updates ...
sc config Wuauserv start= auto
echo Starting Automatic Updates ...
net start "Windows Automatic Update Service"
echo Enabling Windows Error Reporting Service (ERSvc) ...
sc config ERSvc start= auto
echo Starting Windows Error Reporting ...
net start ERSvc
echo Enabling Windows Error Reporting Service (WerSvc) ...
sc config WerSvc start= auto
echo Starting Windows Error Reporting ...
net start WerSvc
echo Checking MS WSUS for any missing updates ... 
wuauclt.exe /detectnow
echo Fixing Downadup infection ...
\\ServerName\ShareName\FixDownadup.exe /SILENT /LOG=c:\computername%_%username%_logFixDownadup.txt
copy c:\computername%_%username%_logFixDownadup.txt \\ServerName\ShareName\Logs\computername%_%username%_logFixDownadup.txt
echo Patching MS08-067 ...
\\ServerName\ShareName\WindowsServer2003-KB958644-x86-ENU.exe /quiet /norestart
echo Rebooting System in one minute ...  
shutdown -r -f -t 1024 -c "Rebooting system, you have 1 minute to save your work"
goto exit
 
:ver_xp
echo Enabling BITs ...
sc config bits start= auto
echo Starting BITs ...
net start "Background Intelligent Transfer Service"
echo Enabling Automatic Updates ...
sc config Wuauserv start= auto
echo Starting Automatic Updates ...
net start "Windows Automatic Update Service"
echo Checking MS WSUS for any missing updates ... 
wuauclt.exe /detectnow
echo Enabling Windows Security Center Service (wscsvc) ...
sc config wscsvc start= auto
echo Starting Windows Security Center ...
net start wscsvc
echo Enabling Windows Error Reporting Service (ERSvc) ...
sc config ERSvc start= auto
echo Starting Windows Error Reporting ...
net start ERSvc
echo Fixing Downadup infection ...
\\ServerName\ShareName\FixDownadup.exe /SILENT /LOG=c:\computername%_%username%_logFixDownadup.txt
copy c:\computername%_%username%_logFixDownadup.txt \\ServerName\ShareName\Logs\computername%_%username%_logFixDownadup.txt
echo Patching MS08-067 ...
\\ServerName\ShareName\WindowsXP-KB958644-x86-ENU.exe /quiet /norestart
echo Rebooting System in one minute ...  
shutdown -r -f -t 1024 -c "Rebooting system, you have 1 minute to save your work"
goto exit
 
:ver_2000
echo Enabling BITs ...
sc config bits start= auto
echo Starting BITs ...
net start "Background Intelligent Transfer Service"
echo Enabling Automatic Updates ...
sc config Wuauserv start= auto
echo Starting Automatic Updates ...
net start "Windows Automatic Update Service"
echo Checking MS WSUS for any missing updates ... 
wuauclt.exe /detectnow
echo Fixing Downadup infection ...
\\ServerName\ShareName\FixDownadup.exe /SILENT /LOG=c:\computername%_%username%_logFixDownadup.txt
copy c:\computername%_%username%_logFixDownadup.txt \\ServerName\ShareName\Logs\computername%_%username%_logFixDownadup.txt
echo Patching MS08-067 ...
\\ServerName\ShareName\Windows2000-KB958644-x86-ENU.EXE /quiet /norestart
echo Rebooting System in one minute ...  
shutdown -r -f -t 1024 -c "Rebooting system, you have 1 minute to save your work"
goto exit
 
:ver_vista-sp0
echo Enabling BITs ...
sc config bits start= auto
echo Starting BITs ...
net start "Background Intelligent Transfer Service"
echo Enabling Automatic Updates ...
sc config Wuauserv start= auto
echo Starting Automatic Updates ...
net start "wuauserv"
echo Checking MS WSUS for any missing updates ... 
wuauclt.exe /detectnow
echo Enabling Windows Security Center Service (wscsvc) ...
sc config wscsvc start= auto
echo Starting Windows Security Center ...
net start wscsvc
echo Enabling Windows Defender Service (WinDefend) ...
sc config WinDefend start= auto
echo Starting Windows Defender ...
net start WinDefend
echo Enabling Windows Error Reporting Service (WerSvc) ...
sc config WerSvc start= auto
echo Starting Windows Error Reporting ...
net start WerSvc
echo Fixing Downadup infection ...
\\ServerName\ShareName\FixDownadup.exe /SILENT /LOG=c:\computername%_%username%_logFixDownadup.txt
copy c:\computername%_%username%_logFixDownadup.txt \\ServerName\ShareName\Logs\computername%_%username%_logFixDownadup.txt
echo Patching MS08-067 ...
\\ServerName\ShareName\Windows6.0-KB958644-x86.msu /quiet /norestart
echo Rebooting System in one minute ...  
shutdown /r /f /c "Rebooting system, you have 1 minute to save your work"
goto exit
 
:ver_vista-sp1
echo Enabling BITs ...
sc config bits start= auto
echo Starting BITs ...
net start "Background Intelligent Transfer Service"
echo Enabling Automatic Updates ...
sc config Wuauserv start= auto
echo Starting Automatic Updates ...
net start "Windows Automatic Update Service"
echo Checking MS WSUS for any missing updates ... 
wuauclt.exe /detectnow
echo Enabling Windows Security Center Service (wscsvc) ...
sc config wscsvc start= auto
echo Starting Windows Security Center ...
net start wscsvc
echo Enabling Windows Defender Service (WinDefend) ...
sc config WinDefend start= auto
echo Starting Windows Defender ...
net start WinDefend
echo Enabling Windows Error Reporting Service (WerSvc) ...
sc config WerSvc start= auto
echo Starting Windows Error Reporting ...
net start WerSvc
echo Fixing Downadup infection ...
\\ServerName\ShareName\FixDownadup.exe /SILENT /LOG=c:\computername%_%username%_logFixDownadup.txt
copy c:\computername%_%username%_logFixDownadup.txt \\ServerName\ShareName\Logs\computername%_%username%_logFixDownadup.txt
echo Patching MS08-067 ...
\\ServerName\ShareName\Windows6.0-KB958644-x86.msu /quiet /norestart
echo Rebooting System in one minute ...  
shutdown /r /f /c "Rebooting system, you have 1 minute to save your work"
goto exit
 
:exit
                                              
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