Question

cryptor virus removal disables .exe files

Asked by: Jamesey1

I have an xp pro machine infected with cryptor I believe. (AVG and malwarebytes call it cryptor anyway)

I have a full acronis backup of the drive.
I have scanned with avg updated in safe mode and removed the virus. On reboot no .exe files work. Pops up asking what to do with the file type.

Same issue when removed with malwarebytes and dr web. (incidently avg was preinstalled and able to run. I am unable to install any other virus fighting software. Malwarebytes and dr web scans were done with the drive slaved.)

I have now reloaded my backup and am looking for another avenue to attack this infection.

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Asked On
2009-07-30 at 07:02:50ID24612974
Topic

Anti-Virus Applications

Participating Experts
4
Points
500
Comments
14

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Answers

 

by: dragon24Posted on 2009-07-30 at 12:01:03ID: 24983287

Have you tried a scan with AVG Link Scanner, which used to be ewido? You might be able to access the online scan using safe mode with networking.
Here is the website: http://linkscanner.avg.com/

 

by: warturtlePosted on 2009-07-31 at 00:02:07ID: 24986835

I think a live CD might be more helpful than other methods of removal. Download the Kaspersky Live CD from here: ftp://ftp.downloads1.kaspersky-labs.com/devbuilds/RescueDisk/ and burn the ISO as an image on a CD. Then boot your computer from this CD and then run the virus scanner. Let us know, how it goes.

Hope it helps.

 

by: Jamesey1Posted on 2009-07-31 at 07:16:10ID: 24988966

running kav rescue now then I'll see what the link scan does. I'll post back

 

by: PhateonPosted on 2009-08-03 at 03:44:33ID: 25003178

All those will work.. but I think, you should do this before you try anything else:

Save the following text as a .INF file:

[Version]
Signature="$Chicago$"
Provider=Symantec

[DefaultInstall]
AddReg=UnhookRegKey

[UnhookRegKey]
HKLM, Software\CLASSES\batfile\shell\open\command,,,"""%1"" %*"
HKLM, Software\CLASSES\comfile\shell\open\command,,,"""%1"" %*"
HKLM, Software\CLASSES\exefile\shell\open\command,,,"""%1"" %*"
HKLM, Software\CLASSES\piffile\shell\open\command,,,"""%1"" %*"
HKLM, Software\CLASSES\regfile\shell\open\command,,,"regedit.exe "%1""
HKLM, Software\CLASSES\scrfile\shell\open\command,,,"""%1"" %*"
HKCU, Software\Microsoft\Windows\CurrentVersion\Policies\System,DisableRegistryTools,0x00000020,0

Right-click the .INF file and click install. It does not display any notice or boxes when you run it. If you face any issues while saving the file, please download the file from here:
http://securityresponse.symantec.com/avcenter/UnHookExec.inf

 

by: PhateonPosted on 2009-08-03 at 03:45:56ID: 25003188

I forgot to add that please turn off any security products that you may have installed or, better run the .INF file in the Safe Mode.

 

by: Jamesey1Posted on 2009-08-03 at 06:22:09ID: 25004040

thanks phateon. I'll try that next. Both the above options with avg and kaspersky removed the virus but also hosed the OS on removal. (Cannot run exe's.) if your suggestion is able to kill it enough then I can perform clean up. I"ll post back

 

by: Jamesey1Posted on 2009-08-03 at 10:08:52ID: 25006332

Ran the inf in safe mode then ran avg to remove the virus on reboot all exe's again would not work. I have to assume I will have the same issue with the kav boot cd. Any other thoughts.

 

by: Jamesey1Posted on 2009-08-03 at 10:21:18ID: 25006432

A more direct question would be how to get exe file association to work again. right now I click on an exe, let's say adobe, and I get the windows pop up that asks 'choose the program you want to use to open the file'.

 

by: Jamesey1Posted on 2009-08-03 at 10:39:02ID: 25006578

ran this tool to get exe's working again

http://www.dougknox.com/xp/fileassoc/xp_exe_fix.zip

continuing scans again.

 

by: rpggamergirlPosted on 2009-08-03 at 20:42:45ID: 25010364

I could've sworn that I've posted here before... but obviously not.


If MalwareBytes and other tools won't help, then run Combofix too and show us the log.
Please download ComboFix by sUBs:
http://download.bleepingcomputer.com/sUBs/ComboFix.exe
(If it doesn't run re-download but rename before saving to your desktop)

You must download it to and run it from your Desktop
Now STOP all your monitoring programs (Antivirus/Antispyware, Guards and Shields) as they could easily interfere with ComboFix.
Double click combofix.exe & follow the prompts.
When finished, it will produce a log. Please save that log and attach it in your next reply by pasting it in the "Code Snippet" or "Attach File" window.
Re-enable all the programs that were disabled during the running of ComboFix..


Note:
Do not mouse-click combofix's window while it is running. That may cause it to stall.

CF disconnects your machine from the internet. The connection is automatically restored before CF completes its run. If CF runs into difficulty and terminates prematurely, the connection can be manually restored by restarting your machine.



If needed, here's the Combofix tutorial which includes the installation of the Recovery Console:
http://www.bleepingcomputer.com/combofix/how-to-use-combofix


 

by: Jamesey1Posted on 2009-08-04 at 11:47:10ID: 25016844

Ok here's the update.

Ran any number of av tools to pull out the bulk of it. I used the kav rescue cd with update definitions. This of course hosed the exe extensions. Used the exe fix tool listed above to get that back. At that point I was able to run malwarebytes, spybot, avg and smitfraud fix after spybot picked that up.

Scanned with each in safe mode until they started coming up clean.

Now it appears my only issue is trying to run defrag says that chkdsk /f is scheduled. Once I correct that I do not believe there are any more issues.

 

by: Jamesey1Posted on 2009-08-04 at 11:47:29ID: 25016847

I had not run combo fix but have used it in the past. Should have thought of that too.

 

by: Jamesey1Posted on 2009-08-04 at 12:56:25ID: 25017530

I'm going to close this and open a separate item for the defrag and chkdisk issue as the virus removal has been resolved. Many thanks.

 

by: warturtlePosted on 2009-08-05 at 06:16:47ID: 25023067

Glad to be of help :-).

20120131-EE-VQP-002

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