How to remove the BN4 virus

Most antivirus programs identify BN4.tmp as malware—for instance Symantec identifies it as Trojan Horse or Backdoor.Trojan, and TrendMicro identifies it as TROJ_DROPPER.HPA or TROJ_FAM_000196d.TOMA.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the BN4.tmp malware

BN4.tmp file information

BN4.tmp does not provide any particulars about the software with which the process was installed, nor is the developer identified within the file.

Description: BN4.tmp is not essential for Windows and will often cause problems. BN4.tmp is located in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 46,592 bytes (25% of all occurrences), 416,768 bytes, 184,320 bytes or 46,080 bytes. 
The software has no file description. BN4.tmp is an unknown file in the Windows folder. The program has no visible window. BN4.tmp is not a Windows system file. BN4.tmp is able to monitor applications. Therefore the technical security rating is 82% dangerous.

Recommended: Identify BN4.tmp related errors

If BN4.tmp is located in a subfolder of the user's profile folder, the security rating is 56% dangerous. The file size is 90,112 bytes. There is no information about the author of the file. The program is not visible. It is not a Windows core file.

Important: You should check the BN4.tmp 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 BN4 issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active BN4 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the BN4.tmp 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 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.

Other processes

BN4.tmp [all]