How to remove the DLL_PenSuit virus

Most antivirus programs identify DLL_PenSuit.dll as malware.

The DLL_PenSuit.dll file is a software component of A4Tech G-series Optical Mice by A4TECH.
DLL_PenSuit.dll is a DLL (Dynamic Link Library) file that belongs to software for the A4Tech G-series Optical Mice, high-end USB gaming mice for personal computers. DLL files store data, code and resources needed by one or more programs in order to function correctly. This is not a critical Windows component and should be removed if known to cause problems. A4Tech is a Taiwanese company that designs and manufactures computer peripherals devices and multimedia equipment such as speakers, keyboards, mice, and webcams. The company was founded in 1987 and is currently headquartered in Taipei, Taiwan. A4Tech has subsidiaries in China, Germany, the US and the UK. It currently employs more than 3000 people.

DLL_PenSuit stands for Dynamic Link Library for PenSuit

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Click to Run a Free Virus Scan for the DLL_PenSuit.dll malware

DLL_PenSuit.dll file information

The process known as Office Shuttle Software appears to belong to software GxStandard16-in-1 by A4TECH (

Description: DLL_PenSuit.dll is not essential for Windows and will often cause problems. DLL_PenSuit.dll is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 67,072 bytes (95% of all occurrences) or 77,312 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. There is no file information. The program has no visible window. There is no detailed description of this service. The file is not a Windows system file. It can change the behavior of other programs or manipulate other programs. DLL_PenSuit.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 78% dangerous.

Uninstalling this variant: You can uninstall the program Office Shuttle Software or G9 16-in-1, or ask the software vendor for support. Click on Office Shuttle Software or G9 16-in-1 in Windows Control Panel (Software or Programs section) to uninstall it.

Recommended: Identify DLL_PenSuit.dll related errors

Important: You should check the DLL_PenSuit.dll 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.


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Best practices for resolving DLL_PenSuit issues

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

DLL_PenSuit.dll [all]