Most antivirus programs identify dll.exe as malware—for instance Symantec identifies it as Trojan.ADH or WS.Reputation.1, and Kaspersky identifies it as Hoax.Win32.BadJoke.Agent.tv or Trojan.Win32.Jorik.Agent.egd.
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Description: Dll.exe is not essential for Windows and will often cause problems. Dll.exe is located in the C:\Windows\System32 folder.
Known file sizes on Windows 8/7/XP are 492,333 bytes (33% of all occurrences), 488,749 bytes or 765,952 bytes.
The software has no file description. The program is not visible. The dll.exe file is an unknown file in the Windows folder. The software is loaded during the Windows boot process (see Registry key: MACHINE\Run, MACHINE\RunServices, Run, User Shell Folders). The dll.exe file is not a Windows system file. Dll.exe is able to record keyboard and mouse inputs, hide itself, monitor applications and manipulate other programs. Therefore the technical security rating is 77% dangerous.
Recommended: Identify dll.exe related errors
If dll.exe is located in a subfolder of the user's profile folder, the security rating is 62% dangerous. The file size is 164,352 bytes (33% of all occurrences), 438,784 bytes or 135,680 bytes. There is no description of the program. The program is not visible. The file is not a Windows system file. The process listens for or sends data on open ports to a LAN or the Internet. The process starts when Windows starts (see Registry key: MACHINE\Run, MACHINE\RunServices, Run, User Shell Folders). Dll.exe is able to record keyboard and mouse inputs.
If dll.exe is located in a subfolder of C:\Windows, the security rating is 90% dangerous. The file size is 84,484 bytes. The file is a file with no information about its developer. The dll.exe file is located in the Windows folder, but it is not a Windows core file. The program has no visible window. The process is loaded during the Windows boot process (see Registry key: MACHINE\Run, MACHINE\RunServices, Run, User Shell Folders). Dll.exe is not a Windows core file.
External information from Paul Collins:
Important: You should check the dll.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.
A clean and tidy computer is the key requirement for avoiding problems with dll. 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 doing a repair of your installation, or in the case of Windows 8, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To help you analyze the dll.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.