Trojan:Win32/ZipBomb!MSR, often referred to as a decompression bomb, is a malicious archive file that is intended to destroy the program or system that is reading it. It does this by compressing the files it contains with a high ratio, which causes the contents to increase exponentially when they are decompressed. The intention is to overload the decompression tool to the point where it uses up too many system resources and might potentially crash the system. Trojan:Win32/ZipBomb!MSR has the ability to appear as innocuous files, tempting users to download and open them with unexpected and destructive results. Both individual users and networked systems are at risk from these trojans, which are a kind of denial-of-service attack.

Illustration of Trojan:Win32/ZipBomb!MSR

How does it infect the computer?

Trojan:Win32/ZipBomb!MSR usually infiltrates a computer by means of deceitful techniques, often posing as trustworthy and innocent files or applications. Spam emails with links or attachments that are dangerous are a popular way to spread infection. Cybercriminals may send reputable-looking emails with attachments or links that, when opened or clicked, cause the Trojan:Win32/ZipBomb!MSR to download and install on the victim’s computer.

Trojan:Win32/ZipBomb!MSR may also enter systems via malicious downloads or hacked websites. Attackers could take advantage of holes in websites or insert Trojan:Win32/ZipBomb!MSR into software downloads that seem innocent. Trojan:Win32/ZipBomb!MSR enters the system when users browse these infected websites or download software that seems authentic. Trojan:Win32/ZipBomb!MSR may be downloaded and executed by users via the use of social engineering tactics, such as convincing offers or false software updates.

How does this malware operate?

A malicious program known as Trojan:Win32/ZipBomb!MSR distributes a compressed file that is intended to be a highly compressed, often recursive archive. Trojan:Win32/ZipBomb!MSR’s payload is designed to trick or overwhelm programs and security systems that deal with compressed files. This Trojan makes use of the compression methods included in archive formats such as ZIP to produce files that, upon decompression, become unnecessarily big, eating up system resources and potentially resulting in a denial of service attack.

By providing a massive quantity of data in a tiny, apparently innocent packet, the intention is to evade automated security scans, overflow storage, and impair the operation of antivirus or other security software. When users unintentionally decompress Trojan:Win32/ZipBomb!MSR file, the enormous resource consumption from the compressed archive’s growth might cause their system to slow down or possibly crash.


The symptoms of Trojan:Win32/ZipBomb!MSR infection may emerge in numerous ways, typically dependent on the precise payload and aim of the Trojan. Noticable drops in computer speed, frequent system crashes, or unexpected error messages popping up are common indicators. Trojan:Win32/ZipBomb!MSR’s existence may also be indicated by anomalous network activity, such as abrupt spikes in network traffic or inexplicable data transfers, when Trojan:Win32/ZipBomb!MSR connects with a distant server or performs malicious actions on the infected machine.

Trojan:Win32/ZipBomb!MSR is also detected as:
Arcabit Archive.Bomb
BitDefender Trojan.Arcbomb.ZJG
Fortinet Archbomb.ZIP
Kaspersky Trojan-ArcBomb.ZIP.Bulk.a
McAfee ZipBomb
Sophos Troj/ArcBomb-A
Symantec Trojan.Gen.NPE
Tencent Win32.Trojan-ArcBomb.Bulk.Jcnw
TrendMicro Trojan.Win32.ZIPBOMB.A, TROJ_ZBOMB.A

For more help

Trojan:Win32/ZipBomb!MSR threat family has disclosed various threats to the public. To access similar threats and effective removal methods, refer to the Trojan category.

How to remove Trojan:Win32/ZipBomb!MSR?

To totally remove Trojan:Win32/ZipBomb!MSR from the computer and get rid of relevant viruses and trojans, please execute the procedures as stated on this page. Make sure that you have completely scanned the system with the suggested malware removal tools and virus scanners.

Quick Fix - Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted PC security and optimization tool equipped with a powerful virus and malware detection engine. This program can get rid of hazardous viruses like Trojan:Win32/ZipBomb!MSR through this procedure.

1. Download the application from the following page:

2. Save the file to your preferred location.

3. Double-click the downloaded file CCSetup.exe and install with the default settings.

CC for Windows Installation

4. At the end of the setup process, click Finish to run Combo Cleaner.

5. The tool will update the signature file, please wait for this process to complete.

6. To begin checking for threats like Trojan:Win32/ZipBomb!MSR, click on the Start Scan button. Wait for this scan to finish.

CC for Windows Start Scan

7. At the end of the scan process, click on Remove all threats to delete the Trojan:Win32/ZipBomb!MSR virus, including all malicious objects from the computer.

Free features of Combo Cleaner for Windows include Disk Cleaner, Big Files finder, Duplicate files finder, and Uninstaller. To use antivirus, privacy scanner, and to delete identified threats, users have to upgrade to a premium version.

Please continue with the succeeding removal procedures if you are comfortable manually getting rid of the virus and malicious items linked to it.

Step 1 : Start Windows in Safe Mode With Networking

Windows 10 / 11 Guide

1. Click on the Windows logo and select the Power icon when options pop up.
2. Select Restart from the options while pressing the Shift key on the keyboard.
3. Choose an Option window will appear. Select the Troubleshoot button.
4. In next window, please choose the Advanced Option.
5. On the Advanced Option window, click on Startup Settings, and then, click the Restart button to reboot the computer.
6. When Windows boots in Startup Settings, press the function key F5 or number 5 on the 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 the Windows Start icon in the lower left section of the screen.
2. Open the Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup, and then click on the Restart Now button.
4. Once the computer starts in the Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings, and then click the Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Step 2 : Run a virus scanner

To remove Trojan:Win32/ZipBomb!MSR, we suggest that you scan the infected computer with this powerful virus removal tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Trojan:Win32/ZipBomb!MSR or similar attacks, you can activate Sophos to have real-time scanning and complete defense against all forms of threats.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

3. On the first window of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. An internet connection is required when running this scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove viruses like Trojan:Win32/ZipBomb!MSR.

6. Click the Start Scanning button to  carry out the Scan. This will check the system for the presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Trojan:Win32/ZipBomb!MSR and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

After executing the above instructions, Trojan:Win32/ZipBomb!MSR should have been completely removed from the computer. If there are still signs of infection or the computer is displaying unusual behaviors, please continue with the remaining procedures.

Step 3 : Double Check with Windows Security Apps

Microsoft Windows has a built-in security application that you can use to double-check if your computer is still infected with Trojan:Win32/ZipBomb!MSR. For Windows 8 and 10/11 users, please run Windows Security. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove the Trojan:Win32/ZipBomb!MSR virus.

Windows 8 / 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove Trojan:Win32/ZipBomb!MSR, viruses, and other malicious items from Windows 8 or Windows 10/11 systems. Follow these procedures to scan your computer with the tool:

1. Tap or click the Search charm, search for Windows Security, and then open the application.

Image of Windows Security Search

2. On the Home tab, click Virus and threat protection from the sidebar.

3. On the main window, click on Scan Options. Then, click on Full Scan button.

Image of Scan Options

4. Lastly, click on the Scan now button to start scanning for the presence of Trojan:Win32/ZipBomb!MSR. The process may take a while to complete.

5. After the scan, Delete/Quarantine identified threats, whether they were relevant to Trojan:Win32/ZipBomb!MSR or not. You may now restart Windows to complete the virus removal process.

How to protect the computer from Trojan:Win32/ZipBomb!MSR?

The initial defense that comes to mind for any computer user is to install an anti-virus or anti-malware program. This move is sensible and probably the most practical way to protect the computer against a Trojan:Win32/ZipBomb!MSR attack. Hence, keep in mind that having security software does not guarantee full protection. The majority of the prevention still lies in being cautious of users, and therefore, we are providing the following information as guidelines to protect the computer from virus infection.

Avoid Malicious Websites

There are enormous numbers of websites that were made for the primary purpose of spreading Trojan:Win32/ZipBomb!MSR. Normally, these sites are involved in integrating malicious pop-up and browser hijacker, that will eventually cause further virus infections. Avoid such websites.

Ignore and Delete Phishing Emails

The mass-mailing of computer viruses gives the attackers the luxury of spreading their malicious code in just one send-off. This will arrive in the inbox as an email that appears to be from a legitimate organization. So, if you receive an unexpected email with a link or an attached file, better delete it immediately.

Do Not Click a Suspicious Link

Links from social media, forums, and blog sites are sometimes being utilized by attackers to drive web users to a malicious page that contains malicious code. Therefore, do not just click on any link, especially if it looks suspicious. Accidental access to the destination site may lead to a Trojan:Win32/ZipBomb!MSR infection.

Be Careful When Downloading Files

Cracked software, serial key generators, and several freeware are seen as another method that spreads the Trojan:Win32/ZipBomb!MSR virus. Avoid acquiring these types of applications, and if there is a need to download freeware or shareware, be sure to obtain it from the official website or trusted providers.


About the author

Leave a Comment

Your email address will not be published. Required fields are marked *