Backdoor:Win32/Zloader.STA is a computer Trojan that opens and dedicate a special port on the infected system to allow access of a remote attacker. Apart from this unauthorized access, the Trojan is also capable of dropping additional threat onto the already infected computer. Backdoor:Win32/Zloader.STA also steals some data from the infected computer and sends it to a remote location, probably a server under the control of a hacker.

Threat Behavior

The functioning of Backdoor:Win32/Zloader.STA is obscured as it mimics the Windows system process. For this reason, some anti-virus programs are unable to detect its existence. It silently attacks the computer and opens a port that is used as a backdoor entry for a distant attacker.

Attackers use different methods for penetrating the computer. In most cases, a threat like this uses a much lighter and less intrusive Trojan horse downloader. Once in the PC, this Trojan will make it easier to download and install Backdoor:Win32/Zloader.STA.


Backdoor:Win32/Zloader.STA assigns a back door port which remote attackers will use to control and handle the infected computer. From a remote site, cybercriminals can monitor the computer, store sensitive data, upload an additional threat, and update the existing Backdoor:Win32/Zloader.STA.

Using the created backdoor port, hackers can perform different malicious actions from a remote computer while computer is infected with Backdoor:Win32/Zloader.STA. Furthermore, the virus can improve its presence by downloading more threats or upgrading itself.

Variants of Backdoor:Win32/Zloader.STA

Backdoor:Win32/Zloader.STB – This variant was discovered on October 31, 2020. It is said to be that identified files are identical to its predecessors. There’s just some little modification on the carrier of Backdoor:Win32/Zloader.STB, which is said to be more concealed in penetrating the computer

Backdoor:Win32/Zloader.STC – Indentified as another severe variant on October 21, 2020. Fortunately, Windows Defender Antivirus and Microsoft Security Essentials can detect and remove Backdoor:Win32/Zloader.STB when complete scan is run on the infected computer.



How to remove Backdoor:Win32/Zloader.STA?

To totally remove Backdoor:Win32/Zloader.STA from the computer and get rid of relevant virus and trojan, please execute the procedures as stated on this page. Make sure that you have completely scan the system with suggested malware removal tools and virus scanners.

Remove Backdoor:Win32/Zloader.STA Instantly

To instantly remove Backdoor:Win32/Zloader.STA, we suggest that you scan the infected computer with this powerful anti-malware tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Backdoor:Win32/Zloader.STA or similar attack, you can activate Malwarebytes to have real-time scanning and complete defense against all forms of threats.

1. Download Malwarebytes Anti-Malware from the link below. Save the file on your hard drive.

2. Once the download completes, double-click on the file MBSetup.exe to run the program.

3. Select desired installation package whether for Personal Computer or Work Computer.

4. On next window, click Install button to proceed.

MBAM Default Install

5. Just proceed with the succeeding prompts until it start to execute the installation procedure.

6. Installation process will take less than a minute. It should run automatically after completing the setup.

7. When Malwarebytes Anti-Malware interface appears, please select Scan on the menu. The program will check for any available update before proceeding. Do not skip this step. Virus scan may take a while, please wait for the process to finish.


8. When scanning is done, Malwarebytes Anti-Malware will display the list of identified threats. Remove all and restart the computer to finalized the scan process.

After executing the above instructions, Backdoor:Win32/Zloader.STA should have been eliminated totally from the computer. If there are still signs of infection or computer is displaying unusual behaviors, please continue with the remaining procedures.

Stage 1 : Start Windows in Safe Mode With Networking

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.
2. Select Restart from the options while pressing Shift key on the keyboard.
3. Choose an Option window will appear, select the Troubleshoot button.
4. On next window, please choose Advanced Option.
5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.
6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.
2. Open Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup and then, click on Restart Now button.
4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Stage 2 :Double Check with Microsoft Security Apps

Microsoft Windows has built-in security application that you can use to double-check if computer is still infected with Backdoor:Win32/Zloader.STA. For Windows 8 and 10 users, please run Windows Defender. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove Backdoor:Win32/Zloader.STA virus.

Windows 8 / 10 Instructions:

Windows Defender is a free tool that was built help you remove Backdoor:Win32/Zloader.STA, viruses, and other malicious items from Windows 8 or Windows 10 system. Follow these procedures to scan your computer with Windows Defender:

1. Tap or click the Search charm, search for defender, and then open Windows Defender.

If Windows Defender is not yet installed on the computer, please proceed to download page using the link below. It also contains detailed instruction to install and use the program effectively. Proper usage is required to totally remove Backdoor:Win32/Zloader.STA


2. On the Home tab, click Full under Scan Options. Click Scan now to start scanning for presence of Backdoor:Win32/Zloader.STA. The process may take a while to complete.


3. After the scan, delete/quarantine identified threats wether it is relevant to Backdoor:Win32/Zloader.STA or not. You may now restart Windows to complete the virus removal process.

Windows XP, Windows Vista, and Windows 7 Instructions:

1. Open Microsoft Security Essentials by going to Windows Start > All Programs. If the tool is not yet installed on the computer, please download Microsoft Security Essentials from the link below. Save the file on your hard drive.

Complete installation guide and usage are also provided on the same link. It is essential in removing Backdoor:Win32/Zloader.STA effectively. If Microsoft Security Essentials is already installed on the PC, please proceed with the steps below.

2. On Microsoft Security Essentials Home screen, please choose Full under Scan Options.

MSE Full Scan

3. Click on Scan Now button to start detecting Backdoor:Win32/Zloader.STA items, viruses, and malware on the PC. Scan may take a while, please be patient and wait for the process to end.

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