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AdwCleaner can't remove "cwmf service"


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#1 Phil Schwarz

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Posted 17 January 2015 - 06:34 PM

My son's computer (64-bit WIn7) has a persistent adware infection (bogus new tabs open up upon clicking links in Chrome, FF, & IE).  I ran Malwarebytes and AdwCleaner, and they nab a bunch of bogus plugins, scheduled tasks, etc.

But they get regenerated soon thereafter.

 

AdwCleaner detects a "cwmf service" that does not show up in the Services applet in Win7's Computer Management UI, but fails to remove it.  A search of the Registry for "cmw" shows that there are two drivers installed, cmwf.sys and cmwr.sys, with driver files of those names appearing in c:\windows\system32\drivers.  The registry entries are in the following keys:

 

HKLM\System\ControlSet001\Control\Safeboot\Minimal\cmwf.sys

HKLM\System\ControlSet001\Control\Safeboot\Minimal\cmwr.sys

HKLM\System\ControlSet001\Control\Safeboot\Network\cmwf.sys

HKLM\System\ControlSet001\Control\Safeboot\Network\cmwr.sys

HKLM\System\ControlSet001\Enum\Root\LEGACY_CMWF

HKLM\System\ControlSet001\Enum\Root\LEGACY_CMWR

HKLM\System\ControlSet001\Services\cmwf

HKLM\System\ControlSet001\Services\cmwr

 

Same set of keys in HKLM\System\ControlSet002 and HKLM\System\CurrentControlSet

 

The Safeboot keys seem to guarantee that I won't be able to remove the drivers even when booting in safe mode.

 

I tried removing the Safeboot\Minimal keys -- but no matter what I do with Registry permissions, I get "Error while deleting key".

 

I tried doing a System Restore to a system restore point prior to the creation date on the driver files (1/7/15, about 9 pm North American EST), but System Restore hung in the "Preparing to restore your system" phase.

 

I did Google searches for "cmwf.sys" and "cmwr.sys" and found only a single blog post about a similar infection involving those drivers, unfortunately in French -- at http://forum.malekal.com/infection-boxore-cmwf-cmwr-sys-t50445.html

My French is good enough to determine that the solution suggested was to use Farbar FRST to remove the drivers and related registry entries -- but it's not good enough to make sure I get all the details right.  And I'm not sure whether FRST will be able to bypass whatever is protecting the registry keys that cause the drivers to load in safe mode.

 

Is this something new?

 

I need help with this one...

Many thanks in advance.

 



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#2 boopme

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Posted 17 January 2015 - 06:54 PM

Hi Phil , let's get a deeper look

Please follow this Preparation Guide, do steps 6,7 and 8 and post in a new topic.
Let me know if all went well.
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#3 Phil Schwarz

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Posted 17 January 2015 - 10:21 PM

DDS.txt and zipped Attach.txt in new topic: http://www.bleepingcomputer.com/forums/t/563585/adwcleaner-cant-remove-cwmf-service/

 

Thanks for the rapid response!



#4 boopme

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Posted 17 January 2015 - 11:02 PM

Now that your log is properly posted, you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a Malware Removal Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show it the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.
From this point on the Malware Removal Team should be the only members that you take advice from, until they have verified your log as clean.
Please be patient. It may take a while to get a response because the Malware Removal Team members are very busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the Malware Removal Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another MRL Team member is already assisting you and not open the thread to respond.
The current wait time is 1 days and ALL logs are answered.
If HelpBot replies to your topic, PLEASE follow Step One so it will report your topic to the team members.
To avoid confusion, I am closing this topic.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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