What is Weknow.ac?

Weknow.ac is a persistent threat that mainly targets Mac users. This piece of potentially unwanted program attacks popular web browsers like Safari, Chrome, Mozilla or other installed browsers on Mac OS. Weknow.ac has the capability to hijack the browser’s homepage and control the online activities. Thus it is also categorized as a browser hijacker. The common source of distribution of this PUP is installing or updating Flash players from fake links or redirect pages.

Fake Flash Player distributes Weknow.ac hijacker

Fake Flash Player distributes Weknow.ac hijacker

The moment Weknow.ac is installed, it quickly attempt to change the browser settings like homepage, search engine and new tab. Thus, users may not display trusted search results. Instead, the search page loads plenty of sponsored ads, paid links, banners and misleading information. As a consequence, users often end up being redirected to sites sponsored by Weknow.ac.

Weknow.ac hijacker on safari and Chrome

Weknow.ac hijacker on safari and Chrome

It only aims to bring traffic for its sponsored sites and earn a profit. By clicking on its ads, the users may end up downloading any ad-supported program, fake extension or rogue security tool like Wise Mac Care, Advanced Mac Cleaner and many more. These tools may further show fake errors on the system and ask users to purchase it’s full version. All these are shady marketing campaigns to earn money.

Weknow.ac further uses tracking cookies to trace the browsing habits of users and other related info of the individual like:

  • System related info-OS version, browser type
  • Apps installed;
  • Read Bookmarks, menu bars and plugins installed to the web browser;
  • Record Search queries entered by the users;
  • URLs visited and links clicked;
  • Geo-location, IP address and so on.

These data are sent to the authors of the program to analyse the browsing patterns and thus they send filtered ads to the web browser. These help them to run advertising campaigns and earn revenue. In lure of all these, the privacy of users is what is totally exploited. Thus, if your browser is affected with Weknow.ac hijacker then, you should stop using the infected browser and seek for removal.

Browser hijacker programs are designed to silently change various settings of the browser that forces the browser to open up the targeted URL each time user start surfing. Being a hijacker like Searchmine.net, Searchbaron.com and Trovi search, Weknow.ac is also a tricky program that is nearly impossible to removal manually. As it modifies various settings of the system without the consent of users. Thus, here is the complete removal solution provided that can help you remove Weknow.ac hijacker from Mac OS.

Special Offer
“Weknow.ac virus” may reinstall itself multiple times if you don’t delete its core files. We recommend downloading Combo Cleaner to scan for malicious programs. This may save your precious time and effort.
Download Combo Cleaner Anti-Malware For Mac
More information on Combo CleanerEULA,and Privacy Policy. Combo Cleaner scans the infected PC for free but you need to purchase its full version for complete removal.
Mac OS: Use Anti-Malware To Scan And Remove Weknow.ac virus (Recommended)

Combo Cleaner is a complete security suite for Mac OS that is developed by “RCS LT” company. This program is featured with anti-virus scanner and system optimization tools like disk cleaner, duplicate files finder, application uninstaller, privacy scanner, and 24*7 customer support service.

Rather than being just a traditional anti-virus or a system optimizer, this single program takes a different approach that eases the user from using a different application to keep their MAC OS protected and optimized.

It is very important to have a reliable anti-virus solution for the computer system. Combo cleaner is one of the best options for MAC users as detects and eliminates all sorts of threats like adware, browser hijacker, Trojans, and other malware. It is a light-themed, easy-to-use interface and keeps updating its threat database hourly to instant detect and remove any sort of malware. Thus ensuring not any malicious stuff is behind within the system.

How to Install and Scan with Combo Cleaner

  • Click the above button to Download the “Combo Cleaner”;
  • Once the download completes, double-click on the downloaded file;
  • After the window opens, drag the Combo Cleaner program icon and drop into your “Applications folder” icon.
    Combo Cleaner Install Step 2

    Combo Cleaner Install Step 2

  • Now, open your “Launchpad” and click on the “Combo Cleaner” icon.
    Combo Cleaner Install Step 3

    Combo Cleaner Install Step 3

  • This will start the combo cleaner installation and updates its latest virus definition. Once done, Combo cleaner will launch;
    Combo Cleaner Dashboard

    Combo Cleaner Dashboard

  • Click on “Antivirus” tab and choose the scan options like Quick, Full, and custom. (Full is recommended for the first time)
    Start Scan For Weknow.ac virus

    Start Scan For Weknow.ac virus

  • Let the scan be completed and it will list all the threat found. Now, click on “Remove All Threats”;
    Scan Result Shows Program associated with Weknow.ac virus

    Scan Result Shows Program associated with Weknow.ac virus

  • After removing the threats, click on the “uninstaller” to find and remove any unwanted programs. Select the program from the list and its related files and then click on “Remove Selected Items
Remove Weknow.ac virus

Remove Weknow.ac virus

download-for-mac

If you still have the second thought about this anti-malware, then you may want to check out our review article about Combo Cleaner.

Mac OS: Manually Find And Remove Weknow.ac virus ( Not Recommended)

If you are going for the manual removal process, then we recommend you to print/download these instructions or open it from another uninfected computer or laptop and follow step-by-step manual removal instruction. Mac OS PDF Guide

Step 1. Ending Process Running Under The “Activity Monitor”

  1. Type “Activity Monitor” in the Launchpad to open it;
    Launchpad-1.1.1

    Launchpad-1.1.1

    Activity Minor - 1.1.2

    Activity Minor – 1.1.2

  2. Scroll through the list of running apps, look for the suspicious ones that appear unknown to you or taking huge CPU resources.
  3. Use the [x] button to quit the process.
    Force Stop -1.2 and 1.3

    Force Stop -1.2 and 1.3

Step 2. Remove Weknow.ac virus Malicious Apps From Mac OS

  1. Open “Finder” by clicking on the Finder application on your dock.
    Finder - 2.1

    Finder – 2.1

  2. In the left pane of the Finder, click on “Applications“.
    Applications - 2.2

    Applications – 2.2

  3. Next, you need to locate the Weknow.ac virus Adware/suspicious apps and remove them. The “Applications” window will display the list of all apps installed on your Mac OS.
    Step - 2.3

    Step – 2.3

  4. Now, you need to go through the list to find out the Weknow.ac virus and other suspicious/malicious or infectious app, select it then right click and then select “Move to Trash”. (Repeat this step until you remove all such apps).
    Move to Trash - 2.4

    Move to Trash – 2.4

  5. Now you need to empty the trash as sometimes program can restore themselves from the trash. On your dock, right-click on the trash icon and then select “Empty Trash”.
    Step - 2.5.1

    Step – 2.5.1

    Step 2.5.2

    Step 2.5.2

NOTE: if something looks suspicious to you but you are not sure of that, search the web to find out more about that app.

Step 3. Remove Weknow.ac virus Apps From Auto-Startup

Generally, malicious programs, Adware and spyware add themselves to the boot process to launch automatically whenever the device boots. So, you need to find such apps and remove from the startups.

  1. Open Apple menu ? System Preferences
    Step - 3.1

    Step – 3.1

  2. Now, choose “Users & Groups” section
    Step - 3.2

    Step – 3.2

  3. Select your username from the left pane;
    Step - 3.3

    Step – 3.3

  4. A list will appear showing login items; check the list and use “” sign to disable Weknow.ac virus or other suspicious/unwanted apps you see. Close the screen.
    Step - 3.4

    Step – 3.4

  5. Next step, from the top menu, choose Go ? Go to Folder, then type /Users/Shared/ within the search box. In the “Sharedfolder”, you need to delete the “Similar” files and folders.
    Step - 3.5.1

    Step – 3.5.1

    Step - 3.5.2

    Step – 3.5.2

    Step - 3.5.3

    Step – 3.5.3

  6. Now Restart your Mac to make the changes into effect.
    Step - 3.6

    Step – 3.6

Step 4. Remove Weknow.ac virus Daemons And Agents From Mac’s Startup

  1. From top menu ? Choose Go ? Go to Folder
    Step - 4.1

    Step – 4.1

  2. Type in “/Library/LaunchDaemons”, within this location you will see lots of files with .plist extension. Scroll through it and find the ones which appear to be suspicious and delete them.
    Step - 4.2.1

    Step – 4.2.1

    Step - 4.2.2

    Step – 4.2.2

  3. Do the same for other launching agents locations:
      1. /Library/LaunchAgents
      2. ~/Library/LaunchAgents

    For example: an adware named Vsearch, you may get launching agent as :
    /Library/LaunchAgents/com.vsearch.agent.plist
    ~/Library/LaunchAgents/com.vsearch.agent.plist
    Don’t forget to empty the trash and then restart the computer.

    Step - 4.3.1

    Step – 4.3.1

    Step - 4.3.2

    Step – 4.3.2

  4. After restart, again repeat step 1-2 and type in: /System/Library/Frameworks/ (look for the malicious file with .framework extension like /System/Library/Frameworks/VSearch.framework)
    Step 4.4.1

    Step 4.4.1

    Step - 4.4.2

    Step – 4.4.2

  5. Put the file to trash, if you find one with a malicious name.
  6. Similarly, do more searches within the location:
    • /Library/Application Support/
    • /Library/PrivilegedHelperTools/
      Step - 4.6.1

      Step – 4.6.1

      Step - 4.6.2

      Step – 4.6.2

      Step - 4.6.3

      Step – 4.6.3

      Step - 4.6.4

      Step – 4.6.4

  7. Put them to trash and again empty the trash and restart the computer.
    Step- 4.7.1

    Step- 4.7.1

    Step - 4.7.2

    Step – 4.7.2

    Step - 4.7.3

    Step – 4.7.3

Step 5. Uninstall Weknow.ac virus Or Unwanted/Suspicious Extensions From Browsers

Reset Safari Browser Guide

Follow the steps to remove unwanted and suspicious extensions from the Safari browser:

  • On the Safari browser, click the “Safari” menu then select “Preferences”.
    Reset Mac Chrome Step-1

    Reset Mac Safari Step-1

  • On the General tab of the Safari preferences, check for any unknown URL added as the default homepage, Within the “Homepage” field enter your preferred URL as your default start-page of the browser.
    Reset Mac Chrome Step-2

    Reset Mac Safari Step-2

  • Next, you need to check for malicious extensions, click on the “Extensions” tab on the same window.
  • Extensions” screen will list all the extensions installed on your safari browser, you need to browse through the list and uninstall the ones which appear to be Adware. If you find a malicious extension select it and then click on “Uninstall”. Repeat the steps to remove all unwanted extensions.
    Reset Mac Safari Step-3

    Reset Mac Safari Step-3

  • Close the Safari browser.
Reset Chrome Browser Guide

To check for unknown extensions installed:

  1. Click on Chrome Menu(three vertical dots at top-right corner) ? Select “Settings” ? Choose “Extensions”.
    Remove Chrome Extensions 1

    Remove Chrome Extensions 1

  2. Scroll through the list of extensions installed on the Chrome browser, if any one of them appears to malicious then click on the “trash” icon next to it. This will remove the extension.
    Remove Chrome Extensions 2

    Remove Chrome Extensions 2

  3. Repeat the step until you are sure of the ones you like to keep.

To Reset The Browser:

Next, you need to reset the default settings like search engines, startup, and new tabs. It is better to use the default reset feature of the Google Chrome which will reset all the unwanted modifications done by third-party programs. Don’t worry you will not lose your saved passwords and bookmarks. However, it will delete cookies, extensions, startups, URLs, homepage and new tabs preferences.

  • Click on Chrome’s main menu then choose “Settings“.
    Reset Browser Chrome 1

    Reset Browser Chrome 1

  • Scroll to the bottom of the page and click on “Advanced”.
    Reset Browser Chrome 2

    Reset Browser Chrome 2

  • Under the Advanced page, go for “Reset and clean up” section, then click on “Reset settings to their original defaults”.
    Reset Browser Chrome 3

    Reset Browser Chrome 3

  • Next, click on “Reset”, you will be prompted for a confirmation This will reset your startup page, a new tab page, search engine, and pinned tabs. It will also disable all extensions and clear temporary data like cookies. Your bookmarks, history, and saved passwords will not be cleared”
  • Click on the “Reset Settings” button to confirm the procedure.
    Reset Browser Chrome 4

    Reset Browser Chrome 4

  • After that, it may ask to restart your browser, click “Yes”.

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