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LSA Shell Export Version - friend or foe?


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7 replies to this topic

#1 wish2learn

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Posted 13 October 2009 - 08:26 AM

Hi Everyone,

From time to time I have LSA Shell Export Version, lsass.exe requesting to connect to the Internet.
I did a search to find out what it is, and my search lead me to this BC page: http://www.bleepingcomputer.com/startups/L...sion-17001.html which indicates that this program may be harmful.

How can I tell if this is a bona fide Windows program or not?

I have Windows XP, and regularly do scans etc.

Thanks.

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#2 boopme

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Posted 13 October 2009 - 03:41 PM

As it most likely is a trojan . Run this MBAM scan.
Is your machine indicating that there is a problem and will reboot in 60 seconds?

Next run MBAM (MalwareBytes):

NOTE: Before saving MBAM please rename it to zztoy.exe....now save it to your desktop.

Please download Malwarebytes Anti-Malware and save it to your desktop.

alternate download link

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.

Edited by boopme, 13 October 2009 - 03:45 PM.

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#3 wish2learn

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Posted 14 October 2009 - 10:42 AM

Boopme, thank you for your detailed help.

My PC doesn't tell me there is a problem that needs rebooting, but I dont allow the LSA Shell to connect to the Internet anyway - I select deny. But I still don't know for sure if its Windows or not.

I already have Malwarebytes (installed in much the same way as you recommend - the recommendation came from BC some time ago).

I went to update it right away and am busy running a scan at the moment (I will get back to you)

Is this good enough, or do you recommend a new installation from scratch?

Once again, thanks for the help!

#4 boopme

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Posted 14 October 2009 - 02:17 PM

We'll look at the log and maybe run something else before we reformat. If we have to go that far.

Edited by boopme, 14 October 2009 - 02:19 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

#5 wish2learn

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Posted 14 October 2009 - 04:19 PM

OK, I ran the Perform Quick Scan - it came up clean.
So just to double check, I ran the Full Scan and checked absolutely everything, and likewise came up clean:

Malwarebytes' Anti-Malware 1.41
Database version: 2961
Windows 5.1.2600 Service Pack 3

10/14/2009 7:49:23 PM
mbam-log-2009-10-14 (19-49-23).txt

Scan type: Full Scan (A:\|C:\|D:\|E:\|F:\|H:\|)
Objects scanned: 412054
Time elapsed: 1 hour(s), 22 minute(s), 5 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: 0

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:
(No malicious items detected)

The first time that I was recommended to install Malwarebytes was in February this year and at that time it found 20 Folders and 37 Files infected - things which had not been revealed by other programs. But now my PC appears to be clean.
The latest Malwarebytes update today confirmed that it had updated to the latest version.

Does this all sound OK to you?
And if so, does the aforementioned 'LSA Shell Export Version, lsass.exe requesting to connect to the Internet' mean?

Thanks for the help.

#6 boopme

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Posted 14 October 2009 - 08:03 PM

Ok I think this is the safe one then. "lsass.exe" (all loswer case) is the Local Security Authentication Server. It verifies the validity of user logons to your PC or server. Lsass generates the process responsible for authenticating users for the Winlogon service.
The good one is here .. C:\WINDOWS\system32\lsass.exe

LSA Shell (Export Version) (file name lsass.exe) is a component of Windows
NT and 2000 operating systems that helps administer access permissions. It
sometimes requires access to the Internet to perform legitimate tasks. It is
normal for this program to request access permission, and it is safe to
grant permission.

LSA Shell (Export Version) is trying to connect to the Internet or your
local network
ZoneAlarm is asking you whether to allow the connection. No breach in your
security has occurred. Your computer is safe.

How LSA Shell (Export Version) uses the Internet
LSA Shell (Export Version) (filename lsass.exe) is the Local Security
Administration Subsystem, the process that runs the Local Security Authority
component of the Windows NT Security Subsystem. (It is also a feature of the
Windows 2000 operating system.) This process handles aspects of security
administration on local computers, including access and permissions. For
example, LSA Shell (Export Version) generates the process responsible for
authenticating users for the Winlogon service.

mombu


Was your firewall telling you this?
The bad one is Worm related and I still want one more scan to be certain.



Next run ATF and SAS:
Note.. SAS doesn't open the registry hives for other user accounts on the system, so scans should be done from each user account.

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
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

#7 wish2learn

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Posted 15 October 2009 - 05:20 AM

OK, I did as you suggested (I already had SuperAntiSpyware but I deleted and did a clean install from the desktop like you said.

AFTCleaner came up clean.
SuperAntiSpyware likewise. Does the result below look OK to you?

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

Generated 10/15/2009 at 11:47 AM

Application Version : 4.29.1002

Core Rules Database Version : 4167
Trace Rules Database Version: 2089

Scan type : Complete Scan
Total Scan Time : 01:43:54

Memory items scanned : 240
Memory threats detected : 0
Registry items scanned : 7199
Registry threats detected : 0
File items scanned : 34255
File threats detected : 0

If correct, then I have one more question if you please?

I would like to know why its important to install programs onto the desktop?
Does this make them safer/less corruptible?
And if so, should I make a habit of installing programs this way?

Thanks so much for your help.

#8 boopme

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Posted 15 October 2009 - 11:35 AM

Hi, we only save it to your desktop, so it is easy to find. It is installed to the proper location from there. Except apps like ATF which do not install to the PC. These desktop icons can be deleted after installation.
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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