How to remove the SYSDLL virus

Most antivirus programs identify SYSDLL.exe as malware—for instance Microsoft identifies it as TrojanProxy:Win32/Koobface.gen!C, and TrendMicro identifies it as TROJ_KOOBFACE.FJ.

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 SYSDLL.exe malware

SYSDLL.exe file information

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

The process SYSDLL.exe has no data about its author.

Description: SYSDLL.exe is not essential for Windows and will often cause problems. The SYSDLL.exe file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 17,408 bytes (75% of all occurrences), 40,960 bytes or 16,896 bytes. 
There is no description of the program. The program is not visible. The file is an unknown file in the Windows folder. The SYSDLL.exe file is not a Windows core file. The software listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 90% dangerous, however you should also read the user reviews.

Recommended: Identify SYSDLL.exe related errors

Important: You should check the SYSDLL.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.


User Comments

once removing sysdll.exe and its conterpart programs, remeber to go back into IE or firefox and reset how you connect to the internet as this virus sets up an proxy server on both browsers.
  Robert Fletcher  

Summary: Average user rating of SYSDLL.exe: based on 1 vote with 1 user comment. One user thinks SYSDLL.exe is dangerous and recommends removing it.

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Best practices for resolving SYSDLL issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active SYSDLL process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the SYSDLL.exe 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 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.

Other processes

SYSDLL.exe [all]