Most antivirus programs identify ddcyy.dll as malware.
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Neither the developer nor the software publisher of ddcyy.dll is identified, as would normally be the case.
Description: Ddcyy.dll is not essential for Windows and will often cause problems. The ddcyy.dll file is located in the C:\Windows\System32 folder.
Known file sizes on Windows 10/8/7/XP are 569,396 bytes (10% of all occurrences), 573,492 bytes and 25 more variants.
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include F1BE60B7-26E7-4EDE-96FA-1956CC3D03D3 or 6D33B121-5C4C-4450-9D1F-7B67085CC199 or 49 more variants. There is no description of the program. The program has no visible window. There is no detailed description of this service. Ddcyy.dll is not a Windows system file. The file is an unknown file in the Windows folder. It is able to monitor web browsers. Ddcyy.dll is able to monitor applications, manipulate other programs and record keyboard and mouse inputs. Therefore the technical security rating is 92% dangerous, however you should also read the user reviews.
Recommended: Identify ddcyy.dll related errors
Important: You should check the ddcyy.dll process on your PC to see if it is a threat. If ddcyy.dll has changed your browser's search engine and start page, you can recover your browser's default settings as follows:Reset default browser settings for Internet-Explorer ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active ddcyy process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the ddcyy.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 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.