How to remove the avifil.dll malware

Most antivirus programs classify avifil.dll as a harmful extension to Internet Explorer: e.g. Rootkit.Win32.Podnuha.y (detected by Kaspersky), and TROJ_AGENT.AEUA (detected by TrendMicro). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated avifil.dll software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about avifil.dll and how to get rid of it.

Click here to automatically remove the avifil.dll malware

Avifil.dll file information

The file does not contain indication of the product name or copyright holder. In Windows Task Manager, it appears simply as avifil.dll.

Description: Avifil.dll is not essential for Windows and will often cause problems. Avifil.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 91,904 bytes (25% of all occurrences), 92,416 bytes and 5 more variants. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include A99CAB61-FC93-440C-B598-57C4417CFDB1 or C90F4226-C6BB-43AD-A236-5AF10E75507A or 6 more variants. The process has no file description. The program has no visible window. The avifil.dll file is located in the Windows folder, but it is not a Windows core file. The avifil.dll file is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. The file is not a Windows system file. Therefore the technical security rating is 94% dangerous, however you should also read the user reviews.

Recommended: Identify avifil.dll related errors

Important: You should check the avifil.dll process on your PC to see if it is a threat. If avifil.dll has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


User Comments

Symantec AntiVirus sees avefill.dll, but it won't delete it automatically. Upon deleting it manually, the file reappears in some time. If anyone has a cure to get rid of it, i would appreciate.
c:/windows/system32/avifil.dll, identified by Symantec as infostealer, cannot be deleted by hand, even in safe mode, when deleting the system says the file is protected from deletion either being used by another program. Simultaneously some pop-up has started to show up by itself. If someone knows how to get rid of it, please, write to Thank you
  Vasiliy, vvv447  

Summary: Average user rating of avifil.dll: based on 2 votes with 2 user comments. 2 users think avifil.dll is dangerous and recommend removing it.

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Best practices for resolving avifil issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active avifil process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the avifil.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

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 cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

avifil.dll [all]