How to remove the BHO App malware

Some anti-malware programs classify blcs.dll as a harmful extension to Internet Explorer: for example GRAY_Gen.2Z1009 or TROJ_BHO.YH (detected by TrendMicro), and Troj/BHO-NT (detected by Sophos). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated BHO App software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about BHO App and how to get rid of it.

Click here to automatically remove the BHO App malware

Blcs.dll file information

The process known as BHO App or IE Module belongs to software Internet Explorer Add on by VinaGame or Microsoft (

Description: Blcs.dll is not essential for the Windows OS and causes relatively few problems. The blcs.dll file is located in the C:\Windows\System32 folder or sometimes in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 77,929 bytes (46% of all occurrences), 77,920 bytes, 84,008 bytes or 151,604 bytes. 
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 0CB66BA8-5E1F-4963-93D1-E1D6B78FE9A2. The program is not visible. It is able to monitor web browsers. There is no detailed description of this service. Blcs.dll is not a Windows system file. The file is an unknown file in the Windows folder. blcs.dll appears to be a compressed file. Therefore the technical security rating is 69% dangerous.

Recommended: Identify blcs.dll related errors

Important: Some malware also uses the file name blcs.dll, for example GRAY_Gen.2Z1009 or TROJ_BHO.YH (detected by TrendMicro), and Troj/BHO-NT (detected by Sophos). Therefore, you should check the blcs.dll process on your PC to see if it is a threat. If BHO App 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 ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


User Comments

One user thinks it's neither essential nor dangerous.

Do you have additional information? Help other users!
What do you know about blcs.dll:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving blcs issues

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

blcs.dll [all]