What is klif?

The genuine klif.sys file is a software component of Kaspersky Anti-Virus by Kaspersky Lab.
"Klif.sys" usually resides in "C:\Windows\System32\drivers". It is an important driver file component of the antivirus software from Kaspersky Lab. It is also used in Zone Alarm software from CheckPoint Software Technologies. At least 12 malware threats have known associations with the name as well. The authentic version's recommended removal method is the Kaspersky Removal Tool which can be downloaded from their website. Sometimes called a "Mini-Filter," it is most likely an anti-rootkit scanner and is able to hook into the system kernel. It has been reported in Windows crashes as causing a "page fault in a nonpaged area," sometimes happening at the login screen preventing system access to remove it. Kaspersky Lab North America, founded in 2004, is the world's largest privately-owned cybersecurity company and one of the fastest-growing, headquartered in Massachusetts, USA with offices in 32 countries. Their technology is widely licensed by other companies in the field for use in their products.

KLIF stands for Kaspersky Lab Intruder Filter

Klif.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if klif.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for klif drivers in need of updating

Klif.sys file information

The process known as Klif Mini-Filter or spuper-ptor or Klif Mini-Filter [fre_wxp_x86 or Klif Mini-Filter [fre_wlh_AMD64_noagava or Klif Mini-Filter fre_wnet_x86 or Klif Mini-Filter [fre_wlh_x86 or Klif Mini-Filter [fre_win8_x64 or Kaspersky Lab Driver

belongs to software Kaspersky Anti-Virus or TSP or nexgbbq or Kaspersky Internet Security or ParetoLogic Anti-Virus PLUS

by Kaspersky Lab ( or Kaspersky Lab ZAO ( or Malwarebytes (

Description: Klif.sys is not essential for Windows and will often cause problems. Klif.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 127,768 bytes (65% of all occurrences), 148,496 bytes and 17 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The file is not a Windows system file. The klif.sys file is a Verisign signed file. Klif.sys is certified by a trustworthy company. The klif.sys file is a trustworthy file from Microsoft. Therefore the technical security rating is 3% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can completely remove Anti-Virus or ZoneAlarm Antivirus (Control Panel ⇒ Uninstall a Program).

Recommended: Identify klif.sys related errors

Important: Some malware disguises itself as klif.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the klif.sys 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.


User Comments

Kaspersky Antivirus
It's required for Windows XP SP2 to shut down properly when used with Kaspersky Anti-virus Pro 5.0
i think its part of kaspersky anti-hacker
  mv   (further information)
belongs to the Kaspersky Antivirus
  SciYann   (further information)
Kaspersky Antivirus anti-rootkit driver, using rootkit technology.
KLIF = _K_aspersky _L_ab _I_nternet _F_irewall
  Joda   (further information)
it appers as the faulty driver during BSODs i commonly get
Kaspersky anti-virus vulnerability
  longboneslinger   (further information)
Kaspersky Antivirus
  Whizard   (further information)
Supposedly KLIF stands for kaspersky lab internet firewall but I only have kaspersky antivirus 6.0
  Party boy  
I have never used any Kaspersky software but this file just caused XP SP2 to blue screen
Also part of ESCAN anti-virus which is based on Kaspersky
  Bill Keenan   (further information)
Double click on drive (same on which operationg system XP with SP2) is installed generates system dump (Blue Screen). And antivirus that i am using is Norton. Blue screen says klif.sys generated error.
avast recognizes it as a rootkit, and doesn't leave me alone, it shows up every 2minutes.
Aparently I can't remove klif and I also can't reinstall Kaspersky
Component of KAV
Malicious rootkit component. Registered as a service, at which point the serivce and reg keys are wiped (zeroed + delete)
Kaspersky Anti-virus
i noe it is by Kaspersky but anyway to remove it
I can delete klif.sys from safemode but MSWindows or Kasperksy reinstallls it and the loop is complete
couldn't download from the web... crashed my computer,and redirected me to the blue screen.
  dennis soto  
This file is also installed with Zone Alarm Free, is not needed for Free (as the AV of Zone Alarm Pro/Suite is Kapersky), and causes problems with C:\System Volume Information\tracking.log hanging virus scanners.
  Zaphod of   (further information)
found in "C:\WINDOWS\system32\ZoneLabs\avsys" Fails to start according to my system log, I am running XP,
Part of Kaspersky
klif.sys is the Kaspersky Lab Interceptor and Filter - aka - Kaspersky Lab Driver. It is known to cause BSOD errors from time to time. It is essential ONLY if you are using Kaspersky Antivirus. Otherwise uninstall it or remove it.
Appears to be halting Win2003 Server Processes
  Brian Tower  
repeated BSOD - last event before critical event (event ID 41 -the system has rebooted without cleanly shutting down first) is "File System Filter 'KLIF' 96.0, 2009-11-11T09:32:39.00000000Z) has successfully loaded and registered with file system manager"
Rootkit Unhooker flags it but I have Kaspersky
Kaspersky AVZ4 rate this file as suspicious. I am going to investigate more about it
Causes Blue screens every other day. Belongs to Kaspersky products
  Richard Hill   (further information)
it freezes my Mac -I installed it in Windows on Parallels, but it installed itself on my OS X volume and is impssible to remove.
use bluescreen view to analyze dump
Kaspersky AV 2012 failing to install on Win XP SP2. "Copy Error: Setup cannot copy the file klif.sys"
My computer has been running slow. I used Not My Fault to crash my system. When I logged on my system and went onto Nirsoft Bluescreenview, two of the lines on the preview say this: The problem seems to be caused by the following file: klif.sys IRQL_GT_ZERO_AT_SYSTEM_SERVICE,
  Michael W.  
Had to help a elderly family friend with laptop and BSOD. Cause was this file.

Rating chart

Summary: Average user rating of klif.sys: based on 43 votes with 35 user comments. 18 users think klif.sys is essential for Windows or an installed application. 7 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 10 users suspect danger. 4 users think klif.sys is dangerous and recommend removing it. 5 users don't grade klif.sys ("not sure about it").

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Best practices for resolving klif issues

A clean and tidy computer is the key requirement for avoiding problems with klif. 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, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the klif.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

klif.sys [all]