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Is this a legit file or infection?


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#1 Hermez

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Posted 06 April 2010 - 12:24 PM

I used autoruns and it lists the files explorer.exe and Explorer.exe.

The startup list indicates these could be possible infections.

One description could explain why my My Documents folder opens on its own why I start up my machine.

Thanks in advance

Hermez

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#2 boopme

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Posted 06 April 2010 - 01:17 PM

Hi Hermez
Do you you know the files full path.. C;\ windows\ xxxxx\xxxxxor something like this.

We should run a malware scan and see if they are still there after.

Next run MBAM (MalwareBytes):

Please download Malwarebytes Anti-Malware (v1.45) and save it to your desktop.alternate download link 1
alternate download link 2
MBAM may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you. Temporarily disable such programs or permit them to allow the changes.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
  • When the installation begins, follow the prompts and do not make any changes to default settings.
  • When installation has finished, make sure you leave both of these checked:
    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
MBAM will automatically start and you will be asked to update the program before performing a scan.
  • If an update is found, the program will automatically update itself. Press the OK button to close that box and continue.
  • If you encounter any problems while downloading the definition updates, manually download them from here and just double-click on mbam-rules.exe to install.
On the Scanner tab:
  • Make sure the "Perform Quick Scan" option is selected.
  • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen:
  • Click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
  • Exit MBAM when done.
Note: If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.
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#3 esde

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Posted 06 April 2010 - 02:50 PM

Hermez, I'm neither telling you your safe nor infected. However, the reason your My Documents folder is opening when you boot into windows is that there are 2 instances of Explorer opening. When you boot into windows, the "good" explorer runs, once, and thats that. If it is started again, it will bring up your My Documents folder. If you'd like to test this, on any machine hit WINDOWS KEY(The windows logo on your keyboard)+R, which will open a Run box, type in "explorer" and watch you My Documents folder open. Hope this answers that question. :thumbsup:
I do not see why man should not be just as cruel as nature.
-Adolf Hitler

#4 Hermez

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Posted 07 April 2010 - 11:20 AM

The path for both files is listed as c:\windows\explorer.exe in autoruns.

I unchecked both files in autoruns, and the My Documents folder no longer opens.

However, no autoruns shows that there is a third file called explorer.exe.

Anywho, here is the mbam log.


Malwarebytes' Anti-Malware 1.45
www.malwarebytes.org

Database version: 3961

Windows 5.1.2600 Service Pack 3
Internet Explorer 8.0.6001.18702

4/7/2010 7:33:01 AM
mbam-log-2010-04-07 (07-33-01).txt

Scan type: Quick scan
Objects scanned: 118714
Time elapsed: 13 minute(s), 51 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 1

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Documents and Settings\Owner.PACOMATIC\Local Settings\Temp\n.exn (Trojan.Dropper) -> Quarantined and deleted successfully.


Thanks for your help.

#5 boopme

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Posted 07 April 2010 - 08:10 PM

Hello.
the files explorer.exe and Explorer.exe <<-- this one is most likely a trojan.

c:\windows\explorer.exe in autoruns is the correct one.
Are you having popups or troouble with desktop drops and you canít see any icons, there is no taskbar Ė all you get is your desktop background.>>|

Do this please.
Open Task Manager (press Ctrl+Alt+Del or Ctrl+Shift+Esc)
see what explorer.exe are there.. Punctuaion and spelling are important.



Next run ATF and SAS: If you cannot access Safe Mode,run in normal ,but let me know.

Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

From your regular user account..
Download Attribune's ATF Cleaner and then SUPERAntiSpyware , Free Home Version. Save both to desktop ..
DO NOT run yet.
Open SUPER from icon and install and Update it
Under Scanner Options make sure the following are checked (leave all others unchecked):
Close browsers before scanning.
Scan for tracking cookies.
Terminate memory threats before quarantining
.
Click the "Close" button to leave the control center screen and exit the program. DO NOT run yet.

Now reboot into Safe Mode: How to enter safe mode(XP)
Using the F8 Method
Restart your computer.
When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
Select the option for Safe Mode using the arrow keys.
Then press enter on your keyboard to boot into Safe Mode
.

Double-click ATF-Cleaner.exe to run the program.
Under Main "Select Files to Delete" choose: Select All.
Click the Empty Selected button.

If you use Firefox or Opera browser click that browser at the top and choose: Select All
Click the Empty Selected button.
If you would like to keep your saved passwords, please click No at the prompt.
Click Exit on the Main menu to close the program
.

NOW Scan with SUPER
Open from the desktop icon or the program Files list
On the left, make sure you check C:\Fixed Drive.
Perform a Complete scan. After scan,Verify they are all checked.
Click OK on the summary screen to quarantine all found items.
If asked if you want to reboot, click "Yes" and reboot normally.

To retrieve the removal information after reboot, launch SUPERAntispyware again.
Click Preferences, then click the Statistics/Logs tab.
Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
If there are several logs, click the current dated log and press View log.
A text file will open in your default text editor.
Please copy and paste the Scan Log results in your next reply.
Click Close to exit the program.


Please ask any needed questions,post logs and Let us know how the PC is running now.

Edited by boopme, 07 April 2010 - 08:11 PM.

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

#6 Hermez

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Posted 08 April 2010 - 02:28 PM

Task Manager indicates that the explorer.exe file is running, not the Explorer.exe file.


Here is the log you requested.


SUPERAntiSpyware Scan Log
http://www.superantispyware.com

Generated 04/08/2010 at 02:35 PM

Application Version : 4.35.1002

Core Rules Database Version : 4781
Trace Rules Database Version: 2593

Scan type : Complete Scan
Total Scan Time : 01:11:24

Memory items scanned : 210
Memory threats detected : 0
Registry items scanned : 5042
Registry threats detected : 0
File items scanned : 19771
File threats detected : 0



Thanks again.

#7 boopme

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Posted 08 April 2010 - 04:07 PM

Good, let's kick this once more to be certain with an Online scan.
Please do an online scan with Kaspersky WebScanner

Please perform a scan with Kaspersky Online Virus Scanner.
-- Requires free Java Runtime Environment (JRE) to be installed before scanning for malware as ActiveX is no longer being used.
-- This scan will not remove any detected file threats but it will show where they are located so they can be cleaned with other tools.
  • Vista users need to right-click the IE or FF Start Menu or Quick Launch Bar icons and Run As Administrator from the context menu.
  • Read the "Advantages - Requirements and Limitations" then press the Posted Image... button.
  • You will be prompted to install an application from Kaspersky. Click the Run button. It will start downloading and installing the scanner and virus definitions.
  • When the downloads have finished, you should see 'Database is updated. Ready to scan'. Click on the Posted Image... button.
  • Make sure these boxes are checked. By default, they should be. If not, please check them and click on the Posted Image... button afterwards:
    • Detect malicious programs of the following categories:
      Viruses, Worms, Trojan Horses, Rootkits
      Spyware, Adware, Dialers and other potentially dangerous programs
    • Scan compound files (doesn't apply to the File scan area):
      Archives
      Mail databases
  • Click on My Computer under the Scan section. OK any warnings from your protection programs.
  • The scan will take a while so be patient and do NOT use the computer while the scan is running. Keep all other programs and windows closed.
  • Once the scan is complete (the 'status' will show complete), click on View Scan Report and any infected objects will be shown.
  • Click on Save Report As... and change the Files of type to Text file (.txt)
  • Name the file KAVScan_ddmmyy (day, month, year) before clicking on the Save button and save it to your Desktop.
  • Copy and paste (Ctrl+C) the saved scan results from that file in your next reply.
-- Note: Some online scanners will detect existing anti-virus software and refuse to cooperate. You may have to disable the real-time protection components of your existing anti-virus and try running the scan again. If you do this, remember to turn them back on after you are finished.

Edited by boopme, 09 April 2010 - 10:08 AM.

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

#8 Hermez

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Posted 09 April 2010 - 08:24 AM

The Kaspersky Scanner is unavailable.

Is there another scanner you would recommend?

#9 boopme

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Posted 09 April 2010 - 10:09 AM

Please try it again, Appears to have been a bad link. I've edited the post above.
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

#10 Hermez

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Posted 11 April 2010 - 01:30 PM

Sorry it took so long, I had some trouble getting started.

I ran the scanner a couple of times on both the critical areas and computer settings.

It did not detect anything and did not list anything on the report.

Thanks again.

#11 boopme

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Posted 11 April 2010 - 03:38 PM

So then all is good now? If so.....

Now you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been backed up, renamed and saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista and Windows 7 users can refer to these links: Create a New Restore Point in Vista or Windows 7 and Disk Cleanup in Vista.
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

#12 Hermez

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Posted 12 April 2010 - 01:11 PM

Done.

Now what?

#13 boopme

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Posted 12 April 2010 - 03:43 PM

Looks good.. disconnect from the internet so you never get infected again, :flowers:

Please take a few minutes to read our quietman7's excellent Tips to protect yourself against malware and reduce the potential for re-infection:,in post 17. :thumbsup:
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

#14 Hermez

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Posted 12 April 2010 - 11:00 PM

:flowers:


Thanks a bunch! :thumbsup:




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