TrojanDropper:PowerShell/Cobacis.B is a detection by Microsoft Defender Antivirus for a computer threat that was known to be the source of additional virus infection. If TrojanDropper:PowerShell/Cobacis.B was detected on the computer, it means there is a looming danger and as such, thoroughly scanning the computer to remove the virus is highly recommended. Disregarding the existence of TrojanDropper:PowerShell/Cobacis.B could yield to highly dangerous threats including the infection of malware and ransomware.

Threat Behavior

Computers may get infected with TrojanDropper:PowerShell/Cobacis.B if user is regularly paying a visit to malicious websites or downloading files from the said source. It is common that most downloadable content from questionable sources like torrent sites and distrustful file-download server to have an embedded virus with them. Hackers and cyber hoodlums alike are using these file servers as a means to deploy malicious applications that may contaminate the computer with TrojanDropper:PowerShell/Cobacis.B.

When TrojanDropper:PowerShell/Cobacis.B is run on the system, it can drop a copy of itself on the System folder. This virus also ensure to run the code on startup by adding a Windows registry. As a result of this boot-up modification, TrojanDropper:PowerShell/Cobacis.B virus runs a simultaneous start-up with Windows operating system.


Presence of TrojanDropper:PowerShell/Cobacis.B would allow another virus or malware to infiltrate the computer. It can find ways to download the threat from a remote server or command the browser to visit an online link that can inject the virus on the computer by exploiting internet browser or task-based command and scripting language on the infected system.

How to remove TrojanDropper:PowerShell/Cobacis.B?

To totally remove TrojanDropper:PowerShell/Cobacis.B 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 TrojanDropper:PowerShell/Cobacis.B Instantly

To instantly remove TrojanDropper:PowerShell/Cobacis.B, 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 TrojanDropper:PowerShell/Cobacis.B 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, TrojanDropper:PowerShell/Cobacis.B 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 TrojanDropper:PowerShell/Cobacis.B. For Windows 8 and 10 users, please run Windows Defender. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove TrojanDropper:PowerShell/Cobacis.B virus.

Windows 8 / 10 Instructions:

Windows Defender is a free tool that was built help you remove TrojanDropper:PowerShell/Cobacis.B, 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 TrojanDropper:PowerShell/Cobacis.B


2. On the Home tab, click Full under Scan Options. Click Scan now to start scanning for presence of TrojanDropper:PowerShell/Cobacis.B. The process may take a while to complete.


3. After the scan, delete/quarantine identified threats wether it is relevant to TrojanDropper:PowerShell/Cobacis.B 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 TrojanDropper:PowerShell/Cobacis.B 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 TrojanDropper:PowerShell/Cobacis.B 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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