The genuine winhost.exe file is a software component of W32.Beagle.CL/K@mm Worm.
"winhost.exe" is a falsifying file in Windows, posing as a legitimate Windows file with its name, icon, and false developer name labeled as Microsoft. The file is a Trojan virus that claims to be the Windows Host Support Service. It runs in the background, displaying pop-ups and pop-unders on the screen that display sexual-themed images. It has also been reported that it opens the doorway to more viruses, which leads to very slow system speeds or frozen system operations.
WinHost stands for Windows Host
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 winhost.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.
Description: Winhost.exe is not essential for Windows and will often cause problems. Winhost.exe is located in a subfolder of "C:\Program Files".
Known file sizes on Windows 10/8/7/XP are 232,448 bytes (76% of all occurrences), 251,392 bytes, 292,864 bytes, 7,926,436 bytes or 13,824 bytes.
There is no description of the program. The program has no visible window. Winhost.exe is not a Windows core file. The application uses ports to connect to or from a LAN or the Internet. Therefore the technical security rating is 89% dangerous, however you should also read the user reviews.
Recommended: Identify winhost.exe related errors
External information from Paul Collins:
There are different files with the same name:
Important: Some malware also uses the file name winhost.exe, for example Trojan.Win32.Agent.arng or Trojan.Win32.Agent.msd (detected by Kaspersky), and TROJ_QHOST.JR or TROJ_GEN.R4FC7KU (detected by TrendMicro). Therefore, you should check the winhost.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 winhost. 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 winhost.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.