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Backdoor infection through Mozilla Firefox


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#1 bumblebeeme

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Posted 17 July 2015 - 09:31 PM

Over the last couple of days Microsoft Security Essentials pops up repeatedly advising it is cleaning a threat and shows the file path as:  ...AppData\Roaming\Mozilla\Firefox\Profiles\falezo4y.default\sessionstore-backups\recovery.js.tmp->(EmbeddedCode)->[PHP]

 

The threat is Backdoor:PHP/SimpleShell.A

 

I have made hidden files visible but looking in the sessionstore-backups folder shows no files ending in .tmp

 

I've just done an online scan with Trendmicro which did not find the threat.

 

Has anyone here managed to remove this threat?


Edited by bumblebeeme, 17 July 2015 - 11:39 PM.


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#2 severac

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Posted 18 July 2015 - 01:42 AM

Hello and welcome,

 

Please download MiniToolBox, save it to your desktop and run it.
Checkmark the following checkboxes:

§  Flush DNS

§  Report IE Proxy Settings

§  Reset IE Proxy Settings

§  Report FF Proxy Settings

§  Reset FF Proxy Settings

§  List content of Hosts

§  List IP configuration

§  List Winsock Entries

§  List last 10 Event Viewer log

§  List Installed Programs

Click Go and post the result (Result.txt). A copy of Result.txt will be saved in the same directory the tool is run.

-------

Download Security Check from here or here and save it to your Desktop.

§  Double-click SecurityCheck.exe

§  Follow the onscreen instructions inside of the black box.

§  Notepad document should open automatically called checkup.txt; please post the contents of that document.

-------

Kaspersky Virus Removal Tool

Please download Kaspersky Virus Removal Tool from here.

§  Right click on KVRT.exe and select Run as Administrator.

§  Read the EULA, then select Accept.

§  Wait for Kaspersky Virus Removal Tool to initialize.

§  In the main screen, select Change parameters, place a checkmark in System drive, then click OK.

§  Click Start scan.

§  Wait for Kaspersky Virus Removal Tool to complete scanning.

§  When the scan is finished, select Neutralize all for all detected objects.

§  Close Kaspersky Virus Removal Tool when done.

Informe me if something is detected.

------------

Please download Malwarebytes Anti-Malware (MBAM) to your desktop.

NOTE. If you already have MBAM 2.0 installed scroll down.

 

§  Double-click mbam-setup-2.x.x.xxxx.exe and follow the prompts to install the program.

§  At the end, be sure a checkmark is placed next to the following:
 

o    Launch Malwarebytes Anti-Malware

o    A 14 day trial of the Premium features is pre-selected. You may deselect this if you wish, and it will not diminish the scanning and removal capabilities of the program.

 

§  Click Finish.

§  On the Dashboard, click the 'Update Now >>' link

§  After the update completes, on Settings tab, set under Detection and Protection next options: 

1. 'Scan for rootkits'

2. Non-Malware Protection, for 'PUP detections', check, 'Threat detections as malware' option.

§  Return to Dashboard, click the 'Scan Now >>' button.

§  A Threat Scan will begin.

§  When the scan is complete, if there have been detections, click Apply Actions to allow MBAM to clean what was detected.

§  In most cases, a restart will be required.

§  Wait for the prompt to restart the computer to appear, than click on Yes.


If you already have MBAM 2.0 installed:
 

§  On the Dashboard, click the 'Update Now >>' link.

§  After the update completes, on Settings tab, set under Detection and Protection next options: 

1. 'Scan for rootkits'

2. Non-Malware Protection, for 'PUP detections', check, 'Threat detections as malware' option.

§  Return to Dashboard, click the Scan Now >> button.

§  A Threat Scan will begin.

§  When the scan is complete, if there have been detections, click Apply Actions to allow MBAM to clean what was detected.

§  In most cases, a restart will be required.

§  Wait for the prompt to restart the computer to appear, than click on Yes.

§  After the restart once you are back at your desktop, open MBAM once more.

§  Click on the History tab > Application Logs.

§  Double click on the Scan Log which shows the Date and time of the scan just performed.

§  Click 'Export'.

§  Click 'Copy to Clipboard'

§  Paste the contents of the clipboard into your reply.

---------

Please download AdwCleaner by Xplode onto your desktop.

§  Close all open programs and internet browsers.

§  Double click on adwcleaner.exe to run the tool.

§  Click on Scan button.

§  When the scan has finished click on Clean button.

§  Your computer will be rebooted automatically. A text file will open after the restart.

§  Please post the contents of that logfile with your next reply.

§  You can find the logfile at C:\AdwCleaner[S0].txt as well.

-----------

Please download Junkware Removal Tool to your desktop.

§  Shut down your protection software now to avoid potential conflicts.

§  Run the tool by double-clicking it. If you are using Windows Vista, 7, or 8; instead of double-clicking, right-mouse click JRT.exe and select "Run as Administrator".

§  The tool will open and start scanning your system.

§  Please be patient as this can take a while to complete depending on your system's specifications.

§  On completion, a log (JRT.txt) is saved to your desktop and will automatically open.

§  Post the contents of JRT.txt into your next message.

----------------------


I would like to help you to remove malware. Let's look inside.   :busy:

But I don't know to solve all PC problems.  :smash: 

 


#3 bumblebeeme

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Posted 18 July 2015 - 10:16 PM

severac, thanks very much for replying. The problem 'appears' to be resolved. I deleted the sessionstore-backups folder and allowed Firefox to create a new backups folder when I restarted it. I also emptied the cache from Firefox. After those actions, Microsoft Security Essentials does not find the file cited above. Also, I do have MalwareBytes on the machine and it cleaned up PUP.optional.somoto and PUP.optional.opencandy - it found nothing else. Do you think it is still necessary to download and run the programs you have suggested, severac?

#4 severac

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Posted 19 July 2015 - 02:48 AM

You can run AdwCleaner and JRT, to remove junk, if you want to. 


I would like to help you to remove malware. Let's look inside.   :busy:

But I don't know to solve all PC problems.  :smash: 

 





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