Help with .dropbox.cache folder

Viruses and worms
1

Hi, my avast is throwing many warnings. It says “Locked suspicious file Object: C:\Users\Matheus\Dropbox.dropbox.cache-ebdb3cb3.tmp”. I used the OTL tool to generate a scan log with more details. Can anyone help me to find the solution for that problem? Thanks for any help.

2

Let me know if this stops the alerts

Warning This fix is only relevant for this system and no other, using on another computer may cause problems

Be advised that when the fix commences it will shut down all running processes and you may lose the desktop and icons, they will return on reboot

Run OTL

[*]Under the Custom Scans/Fixes box at the bottom, paste in the following

https://dl.dropbox.com/u/73555776/OTL_Fix.GIF


:Commands
[CREATERESTOREPOINT]

:OTL
IE - HKU\S-1-5-21-1587509545-3400210194-172808199-1006\..\SearchScopes\{0ECDF796-C2DC-4d79-A620-CCE0C0A66CC9}: "URL" = http://www.delta-search.com/?q={searchTerms}&babsrc=SP_ss&mntrId=360700FF8BB5D348&affID=121225&tsp=4932
[2013/07/03 10:04:05 | 000,006,505 | ---- | M] () -- C:\Users\Matheus\AppData\Roaming\mozilla\firefox\profiles\eidm91jp.default\searchplugins\babylon.xml
O20 - AppInit_DLLs: (c:\progra~3\browse~1\261339~1.144\{c16c1~1\browse~1.dll) - c:\ProgramData\BrowserDefender\2.6.1339.144\{c16c1ccb-7046-4e5c-a2f3-533ad2fec8e8}\BrowserDefender.dll ()


:Files
C:\Users\Matheus\Dropbox\.dropbox.cache
c:\ProgramData\BrowserDefender

:Commands
[resethosts]
[emptytemp]
[Reboot]

[*]Then click the Run Fix button at the top
[*]Let the program run unhindered, reboot the PC when it is done
[*]Open OTL again and click the Quick Scan button. Post the log it produces in your next reply.

3

Hi, unfortunalety it didn’t work. The warning yet keep.

4

I was afraid of that… Bigger hammer time

Download and Install Combofix

Download ComboFix from one of the following locations:
Link 1
Link 2

VERY IMPORTANT !!! Save ComboFix.exe to your Desktop

  • IMPORTANT - Disable your AntiVirus and AntiSpyware applications, usually via a right click on the System Tray icon. They may otherwise interfere with our tools. If you have difficulty properly disabling your protective programs, refer to this link here

[*]Double click on ComboFix.exe & follow the prompts.
[*]Accept the disclaimer and allow to update if it asks

http://img.photobucket.com/albums/v706/ried7/NSIS_disclaimer_ENG.png

http://img.photobucket.com/albums/v706/ried7/NSIS_extraction.png

[*]When finished, it shall produce a log for you.
[*]Please include the C:\ComboFix.txt in your next reply.

Notes:

  1. Do not mouse-click Combofix’s window while it is running. That may cause it to stall.
  2. Do not “re-run” Combofix. If you have a problem, reply back for further instructions.
  3. If after the reboot you get errors about programmes being marked for deletion then reboot, that will cure it.

Please make sure you include the combo fix log in your next reply as well as describe how your computer is running now

5

Firstly, thank so much for your attention.
The the log and the actual processes are attached.

6

Hmm CF normally gets that first time around

  1. Close any open browsers.

  2. Close/disable all anti virus and anti malware programs so they do not interfere with the running of ComboFix.

  3. Open notepad and copy/paste the text in the quotebox below into it:

Folder:: C:\Users\Matheus\Dropbox\.dropbox.cache

Save this as CFScript.txt, in the same location as ComboFix.exe

http://img.photobucket.com/albums/v666/sUBs/CFScriptB-4.gif

Refering to the picture above, drag CFScript into ComboFix.exe

When finished, it will produce a log for you at C:\ComboFix.txt which I will require in your next reply.

7

The log is attached.

8

Could you run a MBAM quick scan please and post the log

9

Hi, following attached file.

Do you think that I should uninstall the dropbox and try remove the remaining files? Can it solve the problem?
However I think there is some script in another folder out of dropbox folder creating those tmp files. What do you think?

10

Are you still getting the alerts as neither CF nor MBAM are seeing it
Is that folder still present on your system

11

What do I do? Can I uninstall dropbox and delete the folders?

12

When you open the dropbox folder is the .dropbox.cache folder visible ?
You may need to show hidden files for this

13

The .dropbox.cache folder is hidden. In it there is many files .tmp. All files are equals. The virus create many those files.

14

The problem is that it may be held in your dropbox account, so as soon as you re-install it will come back. I will use my strongest tool now to kill it

  1. Please download The Avenger by Swandog46 to your Desktop.
    [*]Right click on the Avenger.zip folder and select “Extract All…”
    [*] Follow the prompts and extract the avenger folder to your desktop
  2. Copy all the text contained in the code box below to your Clipboard by highlighting it and pressing (Ctrl+C):

https://dl.dropbox.com/u/73555776/avenger.jpg

Begin copying here: 
Folders to delete:
C:\Users\Matheus\Dropbox\.dropbox.cache


Note: the above code was created specifically for this user. If you are not this user, do NOT follow these directions as they could damage the workings of your system.

  1. Now, open the avenger folder and start The Avenger program by clicking on its icon.

[*] Right click on the window under Input script here:, and select Paste.
[*] You can also click on this window and press (Ctrl+V) to paste the contents of the clipboard.
[*] Click on Execute
[*] Answer “Yes” twice when prompted.

  1. The Avenger will automatically do the following:
    [*]It will Restart your computer. ( In cases where the code to execute contains “Drivers to Delete”, The Avenger will actually restart your system twice.)
    [*]On reboot, it will briefly open a black command window on your desktop, this is normal.
    [*]After the restart, it creates a log file that should open with the results of Avenger’s actions. This log file will be located at C:\avenger.txt
    [*] The Avenger will also have backed up all the files, etc., that you asked it to delete, and will have zipped them and moved the zip archives to C:\avenger\backup.zip.
  2. Please copy/paste the content of c:\avenger.txt into your reply.
15

Seems it worked. The warnings do not appear. However the avenger.txt didn’t created. I disabled the avast and I executed the program as admin.

16

Is there a folder called C:\avenger\backup.zip. ? If so could you put that in your drop box and give me the public link so that I can get a copy

17

There isn’t a folder C:\avenger.

18

The warnings don’t appear, I think the problem was solved.

19

Subject to no further problems :slight_smile:

I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems

Now the best part of the day ----- Your log now appears clean :thumbsup:

A good workman always cleans up after himself so…The following will implement some cleanup procedures as well as reset System Restore points:

Remove ComboFix
[*]Hold down the Windows key + R on your keyboard. This will display the Run dialogue box
[*]In the Run box, type in ComboFix /Uninstall
(Notice the space between the “x” and “/”)
then click OK

http://i1224.photobucket.com/albums/ee362/Essexboy3/Misc%20screen%20shots/CF_Uninstall-1.jpg

[]Follow the prompts on the screen
[]A message should appear confirming that ComboFix was uninstalled

Run OTL and hit the cleanup button. It will remove all the programmes we have used plus itself.

Clear Restore Points

Go Start > All Programmes > Accessories > System tools
Right click Disc Cleanup and select run as administrator
When it pops up at the first prompt select OK after it has done some calculations the tabs will appear
Select More Options tab
Press Sytem Restore and Shadow Copies Cleanup button

https://dl.dropbox.com/u/73555776/disc%20clean.JPG

Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:

http://img233.imageshack.us/img233/7729/mbamicontw5.gif
Malwarebytes.

Update and run weekly to keep your system clean

Download and install FileHippo update checker and run it monthly it will show you which programmes on your system need updating and give a download link

If you use on-line banking then as an added layer of protection install Trusteer Rapport

It is critical to have both a firewall and anti virus to protect your system and to keep them updated. To keep your operating system up to date visit
[*]Microsoft Windows Update

To learn more about how to protect yourself while on the internet read our little guide How did I get infected in the first place ?Keep safe :wave:

20

Ok, thank you so much for your help! ;D