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 host.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.
The process known as Personal SMTP server appears to belong to software Host Service or TightVNC or Microsoft Host Service or SPECTral Personal SMTP Server by Microsoft (www.microsoft.com) or JRRT Project, RIVS Technologies.
Description: Host.exe is not essential for Windows and will often cause problems. Host.exe is located in a subfolder of C:\Windows.
Known file sizes on Windows 10/8/7/XP are 791,040 bytes (22% of all occurrences), 790,528 bytes and 5 more variants.
Host.exe is a file with no information about its developer. The program has no visible window. Host.exe is located in the Windows folder, but it is not a Windows core file. It is not a Windows system file. The application listens for or sends data on open ports to a LAN or the Internet. Host.exe is able to monitor applications, connect to the Internet, record keyboard and mouse inputs and hide itself. Therefore the technical security rating is 81% dangerous, however you should also read the user reviews.
Recommended: Identify host.exe related errors
If host.exe is located in a subfolder of the user's profile folder, the security rating is 54% dangerous. The file size is 536,576 bytes (57% of all occurrences), 86,016 bytes, 161,858 bytes or 209,920 bytes. The file is not a Windows system file. There is no file information. The program has no visible window. Host.exe is able to record keyboard and mouse inputs and monitor applications.
If host.exe is located in the C:\Windows\System32 folder, the security rating is 100% dangerous. The file size is 246,784 bytes (50% of all occurrences) or 258,048 bytes. There is no information about the author of the file. The program starts when Windows starts (see Registry key: Run, MACHINE\RunServices, MACHINE\Run). It is not a Windows core file. The file is an unknown file in the Windows folder. The program is not visible. The process listens for or sends data on open ports to a LAN or the Internet. Host.exe is able to record keyboard and mouse inputs, hide itself and monitor applications.
If host.exe is located in a subfolder of C:\, the security rating is 74% dangerous. The file size is 241,664 bytes.
If host.exe is located in the C:\Windows folder, the security rating is 32% dangerous. The file size is 18,944 bytes.
Important: Some malware also uses the file name host.exe, for example Application.Agent.FH (detected by F-Secure), and Backdoor.Win32.Rbot.bqj (detected by Kaspersky). Therefore, you should check the host.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 host. 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.
To help you analyze the host.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.