What is DFInject.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the DFInject.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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DFInject.exe file information

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

The process known as T-Online Dialerschutz Injection Service or T-Home Dialerschutz Injection Service belongs to software T-Online Dialerschutz-Software or T-Home Dialerschutz-Software by T-Systems Enterprise Services GmbH ( or T-Systems International GmbH (

Description: DFInject.exe is not essential for the Windows OS and causes relatively few problems. The file DFInject.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 179,016 bytes (61% of all occurrences), 288,768 bytes, 184,320 bytes or 165,480 bytes. 
The program is not visible. It is not a Windows system file. It can change the behavior of other programs or manipulate other programs. The file is a Verisign signed file. The file is digitally signed. DFInject.exe is able to manipulate other programs and record keyboard and mouse inputs. Therefore the technical security rating is 48% dangerous.

Recommended: Identify DFInject.exe related errors

Important: Some malware camouflages itself as DFInject.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the DFInject.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.


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Best practices for resolving DFInject issues

A clean and tidy computer is the key requirement for avoiding problems with DFInject. 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 DFInject.exe 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

DFInject.exe [all]