What Is Backdoor.Win32-JS.Save.SilverFox_Obfs?

By Marco Rizal - Editor, Journalist 5 Min Read

Sangfor's antivirus engine detects potential threats with similar characteristics and behaviors under the name Backdoor.Win32-JS.Save.SilverFox_Obfs.

Android files and applications that share similar characteristics and patterns are frequently classified using threat detection names.

You might have encountered the Backdoor.Win32-JS.Save.SilverFox_Obfs detection occurs when scanning with VirusTotal's mobile app (Scanning with the web version does not yield the same result).

However, you should not be concerned because the mentioned threat name is a common false positive that can occur during file scans.

It has been discovered in a wide range of files and applications, including those that are typically regarded as harmless.

Antivirus threat detection in general

Antivirus software is based on large databases that contain signatures and patterns for various types of harmful software, such as viruses, malware, ransomware, trojans, adware, and other potentially dangerous programs that are commonly encountered.

Antivirus software frequently makes use of these datasets. To successfully detect and eliminate malware from a computer.

If an antivirus program finds a file or application on a user's device that matches a signature in its database, it will remove the malicious file.

Similarly, an antivirus program can protect a system by constantly scanning it for potential threats using its extensive database of threat signatures.

The engine checks the uploaded file against all of the known malware patterns in their databases.

However, in some cases, a specific pattern or signature is so common that an antivirus program may incorrectly identify a file as malware when it is not.

Behavior of the threat

Backdoor.Win32-JS.Save.SilverFox_The term “obfs” is commonly used to identify files that may contain or carry harmful malware.

However, the antivirus engine's pattern or characteristics can occasionally result in false positives, which flag legitimate files as malware despite being clean by other antivirus engines.

This is a common problem that occurs with downloaded files, particularly modded APKs obtained from untrustworthy sources.

These modified applications have been designed to obtain cheats and boosts for the game in an easy manner.

As a result, antivirus engines have the ability to detect these changes and classify them as malicious software.

Furthermore, many users have reported that the antivirus app successfully detected popular apps such as Reddit, WhatsApp, Twitter, Google Drive, Instagram, and others.

Backdoor.Win32 JS.Save .SilverFox Obfs Reddit
Backdoor.Win32-JS.Save.SilverFox_Obfs detected in Reddit app.

In this case, it's worth noting that these apps are unlikely to contain malware, so it's a false positive.

More about Backdoor.Win32-JS.Save.SilverFox_Obfs malware

This threat is not necessarily malicious. Instead, it frequently generates false alarms and flags specific files and apps on the device as potential threats.

However, if your phone has malware targeting popular apps or if you downloaded a modified APK from untrustworthy sources, it may need to be removed.

If you want to make sure the detection is not a false positive, try scanning your device with Malwarebytes. It's a popular anti-malware program with a mobile version to help protect your device.

How to run a malware scan with Malwarebytes
  1. Open the Play Store app on your Android device.
  2. To find Malwarebytes Mobile Security, simply enter “Malwarebytes” in the search bar.
  3. Click on Malwarebytes and tap on the Install button.
  4. Once the installation has finished, open the application.
  5. Simply tap Get started.
  6. When you open the app for the first time, Malwarebytes will ask for security permissions on your device. Simply follow the prompts on your screen to enable the necessary permissions.
  7. When you access the Premium screen, you will find clear and straightforward subscription activation and trial options.
    • Start free trial: Begin a trial by subscribing through Google Play. The subscription fee is applied after the 7-day trial period.
    • Already have a subscription: If you already have a subscription, you can easily activate the Premium features by making a purchase from the Malwarebytes online store or restoring a previous Google Play purchase.
    • Skip: Select this option to access the free version.
  8. Once you are in the homepage, click the Scan button to begin scanning the mobile device for malware.
  9. After the scan is finished, follow the on-screen instructions to delete the unwanted objects. Restart the device if prompted.

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