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How to remove the Isass virus

Most antivirus programs identify Isass.exe as malware—e.g. Kaspersky identifies it as Trojan.Win32.Hider.gh or UDS:DangerousObject.Multi.Generic, and Symantec identifies it as W32.SillyFDC or WS.Reputation.1.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the Isass.exe malware

Isass.exe file information

Windows Task Manager with Isass
Isass.exe process in Windows Task Manager

The process known as ABCpdf .NET appears to belong to software ABCpdf .NET by .

Description: Isass.exe is not essential for Windows and will often cause problems. The file Isass.exe is located in a subfolder of "C:\ProgramData" or sometimes in a subfolder of the user's profile folder (usually C:\ProgramData\MicrosoftCorporation\Windows\System32\ or C:\ProgramData\MicrosoftCorporation\Windows\SystemData\). Known file sizes on Windows 10/11/7 are 2,549,760 bytes (4% of all occurrences), 2,509,824 bytes and 34 more variants. file.net/process/isass.exe.html 
The Isass.exe file is not a Windows core file. The program is not visible. The process is loaded during the Windows boot process (see Registry key: Run, User Shell Folders, MACHINE\Run, DEFAULT\Run). It is a file with no information about its developer. Isass.exe is able to monitor applications and manipulate other programs. Therefore the technical security rating is 87% dangerous, however you should also read the user reviews.

Recommended: Identify Isass.exe related errors

External information from Paul Collins:
There are different files with the same name:

Important: You should check the Isass.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.

Score

User Comments

It ist a virus
  megabytes   (further information)
this files is not attack if we not connected with our network
  radja  
how do i get my xp to load
   
it is dangerous
  Yacoob  
want to remove this error from windows2000
  manish  
It slows down dial up connection, hardly
  Nunsey Sellabais  
Lsass is the microsoft Local Security Authentication Server. IT is used to run firewalls and other security features. ISASS is not LSASS. Since the font used by task mgr makes Lowercase l and uppercase I the same, you can't quite tell them apart. Isass is a type of gateway worm, it first gets on your system, and disables your firewall, then takes a hold of LSASS' computer responsabilities, and shuts down your firewalls and other security features.
   
Trojn REmove immediately
  VTB  
I think it is a virus. My xp windows will almost load but will not continue it literally shut down all power to motherboard.
  MorningsunIdaho  
isass is a virus, or part of a virus, Lsass is a legitimate and vital process of XP and I think 2000
  alphamego  
I get an error message at startup which has this file name, after pressing OK it rebbots. All safe modes, etc., go the same way
  Lidia  
may be infected by a virus
  sahirudden  
It crashed my laptop I had to reinstall XP
  les crinson  
NOT to be confused with Lsass as someone has said already, look how similar uppercase 'I' is to lowercase 'l'..... identical some check it is Isass running rather than Lsass!
  Spider_brain  
Type shutdown -a un the run command to stop the shutdown
  Praveen  
I know I can't boot up, System was fine, disconnected and moved it, when put back together, keep getting ISass.exe - system error, next line: Object name not found
  Mike  
It is a virus.
  Godsluv  
it stopped my husband from accessing the net, or doing anything without being shut down, very hard for him to erase and is still working on it, system mechanic did not work on it
  didi  
im with security task manager, and for what its says, its not a virus ..its "LSA SHIELD (Export Version) "...guess its right :S
  Webazo  
LSA Shell Export Version - It´s part of Microsoft Windows XP
  Shadow  
Not a virus, is a part of Windows XP
   
It is definitely a virus. Check this site for more info on how to remove this and other help.
  Shinigane   (further information)
I also get a error message telling that the object name is not found and it has as a title Isass.exe. When I click ok it automatically shuts down the computer even with safe mode. It has to be a virus.
  purukita  
Its says The requested operation was unsucessful... then it reboots
  Qwerty  
It switches off my system in second duration when connected to internet
  Ramesh P Sharma  
i got isass.exe from a computer shop using my flash drive and i didn't know until i inserted it in my own pc.. in my case, it really slows down dial up connection andf my computer can't shut down unless i end the Isass program.
  cherio  
Isass is a base XP file for the services of Windows XP
  Oliver  
l Thats(L) in lsass is fine used as security in some /all firewalls...its when the first character is a capital i (I) then it looks the same but is a trojan. Remove it
  Reg  
It is not a virus, it is needed by your XP
  Imster  
Currently Present in system:when attempting to end process the following alert occurs :"This is a critical system process. Task manager cannot ens this process. (attempted through normal login using admin privelages with Task Manager)
  sandpiper  
It restarts my pc when i connect to net through dial up. Cant delete it...
  Gautham  
Its a virus detected by Mcafee
   
System halts at startup with "cannot write to memory error"
  Brooklynn Craig Inc. Mad, Ky  
its dangerous
    (further information)
Capital Isass.exe is safe. LOWERCASE (isass.exe) is a worm
   
It slows down my computer processes. it runs 323 processes all at once which keep changing from 'running' to 'not responding' in split seconds. If you try to end the task in file manager it forces your computer to shut down.
  Krishane  
It prevents my XP Pro from loading. It is not in C:\windows\system32\ unless it is a hidden file. I did a search for it on another computer running Vista and by doing that it took me directly to the last email I composed and sent.
  Carole  
when i start my computer it says isass.exe missing and my computer restarts. why does this happen
  mj  
it is a virus, and it shuts down your security on your computer and crashes your computer. i will need mine to be fixed professionally
   
It slows down my dial up connection. Cannot be delete this file. For ur info ---http://www.prevx.com/filenames/3850907126820737754-X1/ISASS.EXE.html
  neoaie   (further information)
There is LSASS and ISASS. What I have read is that Lsass is a legitimate Windows program. Isass, beginning with an upper case "i" that looks the same as a lowercase "L" is a virus.
  Marie   (further information)
I am unsure if this is my problem. My computer stalls completely periodically now, and sometimes a baloon says USB device is not found or not working, I forget exact phrase, sometimes I must unplug the mouse as this is what it means, when I plug back it works again
  Paul Luchter luckyshow  
i have vista and i have isass.exe so maybe its not for xp and its a virus
  jason  
Now i have that one in my desktop.And confirm it's a virus i cant open my programs.
  gedhel  
this is an important windows file and at the same time, where the virus injects itself once infected
  zeeroallen   (further information)
it could be a sasser virus, i got one before. to fix it you need to enter your hard drive as a slave drive in another comp then scan it and replace it.
  motion  
I suspect it installs Installshield of MacroVision. a dangerous VPN client with some subscibers
  Venkata Arni  
I had an isass.exe error after i had to run repair through windows setup with f12 hit enter to enter setup then f8 to agree ran repair from there, now my wireless network adapter is really screwed, I have to say isass.exe is some kind of virus or an auto execution program that can really do some damage... as far as a virus, not too sure about that... all i know is i have never seen it before and after I did i had to wipe my computer out entirely. You will have to decide for yourself
  hooks  
Look is it a i = isass.exe or is it a l lsass.exe and all of this is not dangerous
  KuHaKuSo   (further information)
issas.exe =a Trojan virus ! and is linked to an dll in system 32 and and ex file in hidden folder recycler on C. It creates other exe files in Temp and in Temp folder in Local Settings (hidden folder) + Temp. Int Files folder. Opens backdoor to your PC. Seeks contact to internet after you log in. Very difficult to remove. There is a huge difference with Isass.exe (=actually Lsass.exe)! Why? Becasue this one is Windows related. Read the link for more info. I'm infected with it so I know all about it. It's a real RAT!
  Martin   (further information)
I am using Vista 64 bit and Isass ask permition to pass through my norton firewall, but I didn't allow it. I wait for any malfunction on my system but it just goes smoothly. I think Isass is not that important to the system. On the other hand it is an unknown program so why take the risk anyway.
  Regie Bravo  
nothing first I heard of it. Trying to figure out how to get xp to load after this message appear.
  jean  
It's not a virus, its corrupt registry files. From an install disk, or connect the bad hard drive externally to another PC, (not as the main drive), and copy the registry files to the bad hard drive. files are "Windows/System32/Config/(SYSTEM, SAM, SOFTWARE, SECURITY, DEFAULT). Try that.
  DRFnWichita  
This is a Microsoft application that runs the Local Security Authority Process it verifies users that login and generates security tokens
  Winford 'Mac' Maneice   (further information)
To check whether you have Lsass.exe which is safe, or isass.exe which is not safe, type the name of the file in 'search programs & files' in the start menu
   
It's on an XP system that I just finished fixing under C:\Windows\system. System runs without error.
  Samantha  
It's a system file
   
The process name resembles lsass.exe, meaning that it may be a malware program trying to hide itself. Fortunately, Windows' task manager displays text in a font in which the uppercase character I and the lowercase character l are not identical.
  Jike Lunes  
I am not sure about Isass.exe, but as another user said, lsass.exe and Isass.exe look the same in Windows task manager, and just about every other software I looked at the process on. However, if you sort the list alphabetically, you can see if it is lsass.exe or Isass.exe. Mine happened to be lsass.exe, and was correctly digitally signed by Microsoft, and was located in the Sys32. Task Manager identified it as "Local Security Authority Process". The link to more info talks a little bit about the file and what it is. Feel free to look, but it basically says that the program is important to enforce security policies in Windows.
  Billy   (further information)
Go to task manager, right click on the process and select properties. Copy the l/i in the name and then paste it into google search to determine whether it's an l or an i. Remove if it you determine the process is 'isass.exe'. Keep it if you determine the process is 'lsass.exe', which is an essential Windows process.
  j  
Isass.exe is a Windows system process you need
  GBG  
I know the correct location of the file. "C: \ Windows \ System32 \ lsass.exe" The application has intelligence and spyware properties and is a powerful weapon in the hands of a criminal. I recommend that you block internet outbound traffic for this app yourself. The file is digitally signed. Certificate serial number: 330000029fac1c59182fc487ae00000000029f. Data portion from the certificate: CN = Microsoft Windows Production PCA 2011 O = Microsoft Corporation L = Redmond S = Washington C = US File Properties: Local Security Authority Process.
  Jan Nowak_423  
Warning! There is a malware impersonating this file! If you want to be safe you can delete the file with admin permissions as it not essential to Windows.
  Roger S.  

Summary: Average user rating of Isass.exe: based on 57 votes with 63 user comments. 12 users think Isass.exe is essential for Windows or an installed application. 4 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 11 users suspect danger. 26 users think Isass.exe is dangerous and recommend removing it. 17 users don't grade Isass.exe ("not sure about it").


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Best practices for resolving Isass issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active Isass process on your computer and clearly tells you what it is doing. A good Bantivirus tool detects whether the Isass.exe file on your PC might be malware slowing down your system. Such unwanted programs are often not classified as viruses by other antivirus software and therefore go undetected.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To restore the original performance and remove unnecessary programs, you can 8reset your PC. Your personal files will remain intact, but any programs you installed will need to be reinstalled.



Other processes

Isass.exe [all]