Nano Adblocker & Nano Defender ads: what it is and how to remove it

No. Nano Adblocker and Nano Defender began as legitimate extensions designed to block pop-ups, ads, and commercial content across the web. They were available on Google Chrome, Mozilla Firefox, Microsoft Edge, and other Chromium-based browsers.

The original author, jspenguin2017, actively maintained them as trustworthy privacy tools. However, in October 2020, the original author announced that both extensions were sold to unknown developers.

The new owners immediately modified the code in malicious ways, transforming them from privacy tools into malware. This represents a dramatic change in purpose and intent. Firefox versions remain under the original owner's control and are still safe, but the Chromium versions became dangerous.

The new developers added sophisticated malware capabilities to the Nano extensions. They implemented obfuscation techniques to avoid detection by security analysts. The extensions now monitor users' traffic, capture cookies and session data, execute code remotely, and hijack social media accounts.

Most notably, they enlist users' Instagram and Facebook accounts in promotional fraud by automatically liking posts of unknown influencers without permission. Users discovered their accounts liked dozens of posts they never approved. The new code includes anti-analysis features that detect when someone opens developer tools to inspect the extension, immediately changing behavior to hide malicious intent.

The new Nano extension code includes anti-analysis techniques typically used in sophisticated malware like Trojans and backdoors. When you open your browser's developer console to inspect what the extension is doing, Nano Defender detects this and sends a report to its command server. The extension's behavior changes immediately upon detection, hiding its malicious operations from your view.

This deception makes it extremely difficult for security researchers to analyze what the extension actually does without triggering the anti-analysis code. Only advanced forensic techniques by skilled analysts reveal the malware's true capabilities. This anti-analysis feature is a hallmark of professional-grade malware, indicating the new developers have significant technical sophistication.

If Nano Adblocker or Nano Defender was installed in your browser, the extensions directly manipulated your social media accounts. They accessed your Instagram or Facebook session and automatically liked posts of influencers without your knowledge or permission.

Your account authenticated the likes as genuinely coming from you. You did not click anything or intentionally like the posts; the malware did it behind the scenes. Other users around the world received friend requests or saw your new likes in their notifications.

This promotional fraud benefits the influencers while damaging your account reputation. Uninstalling the extensions stops this activity, but any damage to your account from previous malicious likes remains.

Only Chromium-based versions of Nano Adblocker and Nano Defender were compromised by malicious code. Google Chrome versions were definitely affected; Google removed the malware extensions from the Chrome Web Store. Chromium-based Edge versions were also compromised.

Opera, Vivaldi, and Brave browser versions were affected since they use Chromium. Mozilla Firefox versions are safe and were not compromised because the Firefox version remains under the original author's control.

Microsoft Edge versions remain secure according to reports, as MS Edge continues using the previous owner's code and receives no further updates. If you used Firefox, your extensions are still safe. Users of Chrome or other Chromium browsers need to uninstall immediately.

Nano Adblocker and Nano Defender can perform multiple malicious functions beyond social media account hijacking. The extensions monitor your browsing traffic, capturing data about websites you visit and searches you perform. They can steal session cookies that authenticate you to websites, potentially allowing attackers to hijack your sessions without your password.

The remote code execution capability means attackers can run arbitrary code on your browser at any time. This could lead to additional malware infections, credential theft, banking fraud, or ransomware deployment. The full scope of capabilities has not been publicly disclosed, suggesting the malware may have additional hidden functions not yet discovered by researchers.

First, uninstall the Nano extensions from your browser settings. Then perform these critical steps: Scan your entire system with reputable anti-malware software to detect and remove any secondary infections. Change passwords for all your online accounts, especially email and financial services, as the malware may have captured them.

Monitor your bank accounts and credit for unauthorized transactions. Place a fraud alert with credit bureaus. Check your social media account activity log to see what was posted, liked, or accessed while the malware was active.

Review your social media friends list and followers for unfamiliar accounts added by the malware. Enable two-factor authentication on all important accounts. Monitor email for suspicious login notifications from unrecognized devices or locations.

Because Nano Adblocker and Nano Defender ran at the browser level and focused on browser-based malicious activity, obvious system-wide damage is less likely than if a Trojan or ransomware infected you. However, the malware could have installed additional files or components.

Run comprehensive anti-malware scans and look for any detected items beyond the Nano extensions themselves. If your browser or system performs unusually slowly, crashes frequently, or shows unfamiliar processes in Task Manager, this suggests secondary infections. Check your browser extensions list for any unknown extensions beyond Nano.

Review your browser homepage and search engine settings to ensure they were not hijacked. If you notice installed programs you did not intentionally install, uninstall them immediately. Use system repair tools to fix any registry or file system damage detected after malware removal.

Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.

For Nano Adblocker & Nano Defender, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.

Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.