How to remove the captcha virus

Most antivirus programs identify captcha.dll as malware—e.g. TrendMicro identifies it as WORM_KOOBFACE.KE or TROJ_GEN.R0CE1H4, and Microsoft identifies it as Trojan:Win32/Koobface.gen!J.

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 captcha.dll malware

Captcha.dll file information

The process captcha (captcha) contains no information about its author.

Description: Captcha.dll is not essential for Windows and will often cause problems. The file captcha.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 18,944 bytes (66% of all occurrences), 19,456 bytes or 25,600 bytes. 
The service can be started or stopped from Services in the Control Panel or by other programs. There is no file information. The program is not visible. There is no detailed description of this service. The captcha.dll file is not a Windows system file. captcha.dll appears to be a compressed file. Therefore the technical security rating is 56% dangerous.

Recommended: Identify captcha.dll related errors

If captcha.dll is located in the "C:\Program Files" folder, the security rating is 100% dangerous. The file size is 19,456 bytes. There is no file information. The program is not visible. Captcha.dll is able to record keyboard inputs. There is no detailed description of this service. It is not a Windows system file. captcha.dll appears to be a compressed file.

Important: You should check the captcha.dll 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 captcha issues

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

captcha.dll [all]