Removal instructions for the "Bull Checker" malicious browser extension
Written by Tomas Meskauskas on
What kind of software is Bull Checker?
Bull Checker is a malicious browser extension that operates as a cryptocurrency stealer. It modifies digital asset transactions to reroute them into wallets in the cyber criminals' possession. At the time of research, Bull Checker targeted Solana cryptocurrency (SOL).
Bull Checker browser extension overview
Upon installation, the Bull Checker browser extension requests permission to "Read and change all your data on all websites". This suspicious request is standard for a variety of malicious extensions, including adware and browser hijackers.
Said permission is often abused to collect sensitive user information (e.g., browsing history, Internet cookies, usernames/passwords, credit card numbers, etc.). Bull Checker's malicious functionality is likely facilitated through this broad permission.
When this browser extension is installed, it monitors when users interact with dApps, but the interaction appears ordinary. Once an outgoing transaction is detected, it is modified so that users approve a transfer to the cyber criminals' wallets. This activity does not leave significant traces; no vague or suspicious transactions appear on victims' cryptowallets. However, their digital assets are transferred to cyber criminals.
As mentioned in the introduction, Bull Checker has been observed being used to steal Solana (SOL). Keep in mind that this malicious extension could target other cryptocurrencies as well.
It must be mentioned that cryptocurrency transactions are irreversible because of their nearly untraceable nature. Therefore, victims cannot recover the stolen assets.
To summarize, the presence of Bull Checker on browsers can result in significant financial losses. Having malicious software of this kind installed on devices may also pose threats associated with system infections and privacy issues.
| Name | Bull Checker Solana drainer |
| Threat Type | Malicious Extension, Unwanted Extension |
| Browser Extension(s) | Bull Checker |
| Cyber Criminals Cryptowallet Address | 8QYkBcer7kzCtXJGNazCR6jrRJS829aBow12jUob3jhR (Solana) |
| Distribution Methods | Social engineering, dubious websites, malicious installers, deceptive pop-up ads, free software installers (bundling), torrent file downloads. |
| Damage | Monetary loss |
| Malware Removal (Windows) | To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner. |
Malicious browser extensions in general
We have investigated thousands of unwanted/malicious extensions. This software can have various harmful capabilities. Data tracking and functioning as adware or browser hijackers are by far the most common modes of operation.
These browser extensions tend to appear legitimate and useful. They can entice users to download/install by promising "handy" and "advantageous" features. However, these functionalities seldom work as advertised, and in most cases – they do not work at all.
It must be stressed that even if an extension or application operates exactly as detailed by its promotional material – that is not definitive proof of either legitimacy or safety.
How did Bull Checker install on my computer?
Bull Checker was noted being promoted on the Reddit social network. Victims were targeted directly by cyber criminals writing to Redditors who were interested in trading memecoins. These users were recommended to install the Bull Checker browser extension.
It is noteworthy that other promotional methods are not unlikely. Malicious extensions can have "official" download pages, and they are endorsed on scam websites.
Most visitors access these webpages via redirects caused by sites using rogue advertising networks, misspelled URLs, intrusive ads, spam browser notifications, and installed adware.
"Bundling" – packing regular program installers with unwanted/malicious additions – is another prevalent distribution technique. These pre-packed installation setups can be downloaded from freeware and free file-hosting sites, Peer-to-Peer sharing networks, and other suspicious channels.
The risk of inadvertently allowing bundled content into the system is furthered by treating installations with negligence (e.g., ignoring terms, skipping sections, using "Easy/Quick" settings, etc.).
Intrusive advertisements also spread software of this kind. Some of the adverts can be triggered (i.e., by being clicked) to execute scripts that perform downloads/installations without user permission.
How to avoid installation of unwanted software?
It is essential to research software before downloading or purchasing. All downloads must be made from official and verified sources. When installing, we recommend studying terms and options, using the "Custom/Advanced" settings, and opting out of all supplementary apps, extensions, features, tools, and so on.
Another recommendation is to be careful while browsing since fraudulent and dangerous online content usually appears legitimate and harmless. For example, while intrusive ads may look innocuous – they redirect to highly questionable websites (e.g., gambling, scam-promoting, pornography, adult dating, etc.).
In case of continuous encounters with such adverts/redirects, inspect the system and immediately remove all dubious applications and browser extensions/plug-ins. If your computer is already infected with Bull Checker, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate this rogue software.
Instant automatic malware removal:
Manual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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Quick menu:
- What is Bull Checker?
- STEP 1. Uninstall unwanted applications using Control Panel.
- STEP 2. Remove rogue extensions from Google Chrome.
Unwanted software removal:
Windows 11 users:
Right-click on the Start icon, select Apps and Features. In the opened window search for the application you want to uninstall, after locating it, click on the three vertical dots and select Uninstall.
Windows 10 users:
Right-click in the lower left corner of the screen, in the Quick Access Menu select Control Panel. In the opened window choose Programs and Features.
Windows 7 users:
Click Start (Windows Logo at the bottom left corner of your desktop), choose Control Panel. Locate Programs and click Uninstall a program.
macOS (OSX) users:
Click Finder, in the opened screen select Applications. Drag the app from the Applications folder to the Trash (located in your Dock), then right click the Trash icon and select Empty Trash.
In the uninstall programs window, look for any unwanted applications, select these entries and click "Uninstall" or "Remove".
After uninstalling the unwanted applications, scan your computer for any remaining unwanted components or possible malware infections. To scan your computer, use recommended malware removal software.
Remove rogue extensions from Internet browsers:
Video showing how to remove potentially unwanted browser add-ons:
Remove malicious extensions from Google Chrome:
Click the Chrome menu icon 
(at the top right corner of Google Chrome), select "Extensions" and click "Manage Extensions". Locate "Bull Checker" and all other recently-installed suspicious extensions, select these entries and click "Remove".
Optional method:
If you continue to have problems with removal of the bull checker solana drainer, reset your Google Chrome browser settings. Click the Chrome menu icon (at the top right corner of Google Chrome) and select Settings. Scroll down to the bottom of the screen. Click the Advanced… link.
After scrolling to the bottom of the screen, click the Reset (Restore settings to their original defaults) button.
In the opened window, confirm that you wish to reset Google Chrome settings to default by clicking the Reset button.
Summary:
Commonly, adware or potentially unwanted applications infiltrate Internet browsers through free software downloads. Note that the safest source for downloading free software is via developers' websites only. To avoid installation of adware, be very attentive when downloading and installing free software. When installing previously-downloaded free programs, choose the custom or advanced installation options – this step will reveal any potentially unwanted applications listed for installation together with your chosen free program.
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Frequently Asked Questions (FAQ)
What harm can Bull Checker cause?
Bull Checker is a malicious extension designed to steal cryptocurrency. Hence, having this piece of software installed on your browser can lead to significant financial losses. This extension might also pose other serious threats, such as system infections or privacy issues.
What does Bull Checker do?
Bull Checker modifies outgoing cryptocurrency transactions to reroute the funds into cyber criminals' cryptowallets. It is pertinent to mention that this activity does not leave significant traces, such as any suspicious transactions.
I have lost cryptocurrency through Bull Checker, can I get my money back?
Cryptocurrency transactions are practically untraceable – hence, they cannot be reversed. This means that victims cannot retrieve the stolen funds.
Will Combo Cleaner remove malicious software?
Yes, Combo Cleaner will scan your device and eliminate detected unwanted/malicious software. Keep in mind that manual removal (unaided by security tools) might be ineffective. In some instances, after the software has been manually removed – various remnants (files) stay hidden within the system. What is more, these components might continue to run and cause issues. Therefore, it is essential to eliminate undesirable software thoroughly.
Outstanding!
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