Most antivirus programs identify Spool.exe as malware—for example Microsoft identifies it as Backdoor:Win32/Koceg.gen!A or Backdoor:Win32/Koceg.B, and TrendMicro identifies it as WORM_SOCKS.BL or BKDR_SMALL.JAN.
The Spool.exe file is a software component of Spooler Subsystem App by Windows.
"Spool.exe" is a Windows system file that manages incoming print processes within Windows. It has the same purpose as the files "spool32.exe," "spoolsv.exe," etc. As the user selects print, it handles each incoming request in the order it was selected and forwards the operation to the printer. This particular file is a big target for malware. The malware can get installed by another application and then replaces the original. Most infections utilize FTP to send information to a remote server. In those situations, the process will use around 99% of your PC's resources and cause it to slow down or freeze, especially after startup. Microsoft began in 1975 developing Altair Basic for the Altair 8800 by Micro Instrumentation and Telemetry Systems (MITS). Since then, they have become a leader in programming software and PC products.
spool stands for print spooler
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Description: Spool.exe is not essential for Windows and will often cause problems. The Spool.exe file is located in a subfolder of the user's profile folder.
Known file sizes on Windows 10/8/7/XP are 14,954 bytes (20% of all occurrences), 48,270 bytes, 99,472 bytes, 81,712 bytes or 59,608 bytes.
The program has no file description. The process starts when Windows starts (see Registry key: Run, MACHINE\Run, DEFAULT\Run, Winlogon\Shell). Spool.exe is not a Windows system file. Spool.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 66% dangerous, however you should also read the user reviews.
Recommended: Identify Spool.exe related errors
If Spool.exe is located in a subfolder of C:\, the security rating is 56% dangerous. The file size is 190,976 bytes. There is no description of the program. The program has no visible window. It is not a Windows system file. Spool.exe is able to record keyboard and mouse inputs.
If Spool.exe is located in the C:\Windows\System32 folder, the security rating is 90% dangerous. The file size is 26,112 bytes. The application has no file description. The file is not a Windows core file. The program has no visible window. The file is located in the Windows folder, but it is not a Windows core file. The application is loaded during the Windows boot process (see Registry key: Run, MACHINE\Run, DEFAULT\Run, Winlogon\Shell). Spool.exe is able to monitor applications.
External information from Paul Collins:
There are different files with the same name:
Important: You should check the Spool.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.
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active Spool process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the Spool.exe 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 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.