A Trojan:PowerShell/Boxter detection means malicious PowerShell code has been identified on your system – a category of threat that security teams treat with heightened concern because PowerShell is a trusted, built-in Windows scripting environment with deep system access. Malware that operates through PowerShell scripts can interact with virtually every aspect of a Windows system, download and execute further code in memory without touching the disk, modify security settings, and chain together complex multi-stage operations through a tool that many security products are designed to trust rather than block. The Defender detection is the alert you want to catch early.
Trojan:PowerShell/Boxter is a detection issued by Microsoft Defender Antivirus for malicious PowerShell scripts in the Boxter family. As documented in Microsoft Security Intelligence, this detection category covers trojans implemented as PowerShell scripts that abuse Windows’ native scripting infrastructure to conduct malicious activity. PowerShell-based trojans are valued by attackers for their ability to operate as “living off the land” malware – using trusted Windows components rather than external executables, making them harder to detect with signature-based security tools focused on traditional executable files.
| Name | Trojan:PowerShell/Boxter |
| Threat Type | PowerShell Trojan / Script-Based Malware (Microsoft Defender Detection) |
| Symptoms | Microsoft Defender alert for Trojan:PowerShell/Boxter; suspicious PowerShell windows briefly appearing and closing; unusual scripts executing in the background; unexpected system configuration changes; secondary malware downloaded following the initial PowerShell execution; Windows Defender script scanning alerts alongside the primary detection |
| Removal Time | Around 15 Minutes |
| Removal Tool | See If Your System Has Been Affected by Malware
* Free Remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. SpyHunter’s EULA, Privacy Policy, and more details about Free Remover. |
How Did I Get Trojan:PowerShell/Boxter?
PowerShell-based trojans reach systems through vectors that involve some form of script execution trigger:
- Malicious document macros – Office files distributed through email campaigns that, when macros are enabled by the recipient, execute PowerShell commands to download and run the Boxter payload.
- ClickFix and fake CAPTCHA social engineering – deceptive web pages that trick users into running PowerShell commands directly by instructing them to open Run and paste a clipboard-loaded command, as detailed in the FakeCaptcha attack pattern.
- Compromised software installers – setup files for pirated software or fake utilities that drop and execute PowerShell scripts during installation rather than delivering the promised application.
- Exploit-delivered script execution – browser or plugin exploits that gain code execution and use it to invoke PowerShell for payload retrieval and execution without requiring any user interaction.
- Fileless delivery through legitimate tools – the Boxter scripts may be delivered via mshta, wscript, or other Windows scripting hosts that launch the PowerShell code from a remote URL without first saving a file to disk, complicating detection and forensic analysis.
What Does Trojan:PowerShell/Boxter Do?
PowerShell trojans in the Boxter family leverage the scripting environment for a range of malicious operations:
- Downloads and executes additional payloads in memory – a core capability of PowerShell-based malware is the ability to retrieve code from a remote URL and run it entirely in memory without writing a file to disk, bypassing file-based detection mechanisms.
- Establishes persistence through PowerShell-friendly mechanisms including registry-based script launching, scheduled tasks that call PowerShell with encoded command parameters, and WMI event subscriptions that trigger script execution on system events.
- Modifies Windows Defender settings – adding script execution policy changes, adding exclusion paths, or disabling real-time protection through legitimate PowerShell cmdlets to reduce interference with its operations.
- Collects system and credential information – PowerShell’s access to .NET libraries and Windows APIs makes it capable of comprehensive data collection including browser credential extraction, clipboard monitoring, and keystroke capture.
- Can serve as a downloader or dropper for conventional executable malware, acting as the initial stage that prepares the system and delivers the actual payload that operates long-term on the machine.
- Manipulates system configuration – firewall rules, proxy settings, hosts file entries, and security policy changes are all achievable through PowerShell with sufficient privileges.
How to Delete Trojan:PowerShell/Boxter?
- Disconnect from the internet immediately – PowerShell trojans frequently maintain active connections for command-and-control communication and in-memory payload delivery; cutting the connection limits ongoing activity.
- Accept Defender’s recommended action if the detection alert is still open – PowerShell scripts flagged by Defender should be quarantined rather than dismissed.
- Boot into Safe Mode with Networking – restart, hold Shift and click Restart, navigate to Troubleshoot – Advanced Options – Startup Settings, press 5. This prevents persistence mechanisms from relaunching the script at startup.
- Run a full scan with SpyHunter in Safe Mode to detect script-based components, persistence entries (including WMI subscriptions and encoded scheduled tasks), and any secondary payloads delivered by the Boxter script.
- Check PowerShell execution policy by opening PowerShell as administrator and running Get-ExecutionPolicy – if it has been changed to Unrestricted or Bypass, restore it to a more restrictive setting such as RemoteSigned.
- Review Task Scheduler for tasks with PowerShell in their Action command line, especially those using -EncodedCommand or retrieving content from URLs.
- Check installed programs for anything added around the time of the detection and uninstall unfamiliar entries.
- Restart normally and run a second scan to verify complete removal. Change account passwords from a clean device if credential harvesting is suspected.
Ventsislav Krastev
Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.
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Preparation before removing Trojan:PowerShell/Boxter.
Before starting the actual removal process, we recommend that you do the following preparation steps.
- Make sure you have these instructions always open and in front of your eyes.
- Do a backup of all of your files, even if they could be damaged. You should back up your data with a cloud backup solution and insure your files against any type of loss, even from the most severe threats.
- Be patient as this could take a while.
- Scan for Malware
- Fix Registries
- Remove Virus Files
Step 1: Scan for Trojan:PowerShell/Boxter with SpyHunter Anti-Malware Tool
Step 2: Clean any registries, created by Trojan:PowerShell/Boxter on your computer.
The usually targeted registries of Windows machines are the following:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
You can access them by opening the Windows registry editor and deleting any values, created by Trojan:PowerShell/Boxter there. This can happen by following the steps underneath:
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.Step 3: Find virus files created by Trojan:PowerShell/Boxter on your PC.
1.For Windows 8, 8.1 and 10.
For Newer Windows Operating Systems
1: On your keyboard press + R and write explorer.exe in the Run text box and then click on the Ok button.
2: Click on your PC from the quick access bar. This is usually an icon with a monitor and its name is either “My Computer”, “My PC” or “This PC” or whatever you have named it.
3: Navigate to the search box in the top-right of your PC's screen and type “fileextension:” and after which type the file extension. If you are looking for malicious executables, an example may be "fileextension:exe". After doing that, leave a space and type the file name you believe the malware has created. Here is how it may appear if your file has been found:
N.B. We recommend to wait for the green loading bar in the navigation box to fill up in case the PC is looking for the file and hasn't found it yet.
2.For Windows XP, Vista, and 7.
For Older Windows Operating Systems
In older Windows OS's the conventional approach should be the effective one:
1: Click on the Start Menu icon (usually on your bottom-left) and then choose the Search preference.
2: After the search window appears, choose More Advanced Options from the search assistant box. Another way is by clicking on All Files and Folders.
3: After that type the name of the file you are looking for and click on the Search button. This might take some time after which results will appear. If you have found the malicious file, you may copy or open its location by right-clicking on it.
Now you should be able to discover any file on Windows as long as it is on your hard drive and is not concealed via special software.
Trojan:PowerShell/Boxter FAQ
What Does Trojan:PowerShell/Boxter Trojan Do?
The Trojan:PowerShell/Boxter Trojan is a malicious computer program designed to disrupt, damage, or gain unauthorized access to a computer system. It can be used to steal sensitive data, gain control over a system, or launch other malicious activities.
Can Trojans Steal Passwords?
Yes, Trojans, like Trojan:PowerShell/Boxter, can steal passwords. These malicious programs are designed to gain access to a user's computer, spy on victims and steal sensitive information such as banking details and passwords.
Can Trojan:PowerShell/Boxter Trojan Hide Itself?
Yes, it can. A Trojan can use various techniques to mask itself, including rootkits, encryption, and obfuscation, to hide from security scanners and evade detection.
Can a Trojan be Removed by Factory Reset?
Yes, a Trojan can be removed by factory resetting your device. This is because it will restore the device to its original state, eliminating any malicious software that may have been installed. Bear in mind that there are more sophisticated Trojans that leave backdoors and reinfect even after a factory reset.
Can Trojan:PowerShell/Boxter Trojan Infect WiFi?
Yes, it is possible for a Trojan to infect WiFi networks. When a user connects to the infected network, the Trojan can spread to other connected devices and can access sensitive information on the network.
Can Trojans Be Deleted?
Yes, Trojans can be deleted. This is typically done by running a powerful anti-virus or anti-malware program that is designed to detect and remove malicious files. In some cases, manual deletion of the Trojan may also be necessary.
Can Trojans Steal Files?
Yes, Trojans can steal files if they are installed on a computer. This is done by allowing the malware author or user to gain access to the computer and then steal the files stored on it.
Which Anti-Malware Can Remove Trojans?
Anti-malware programs such as SpyHunter are capable of scanning for and removing Trojans from your computer. It is important to keep your anti-malware up to date and regularly scan your system for any malicious software.
Can Trojans Infect USB?
Yes, Trojans can infect USB devices. USB Trojans typically spread through malicious files downloaded from the internet or shared via email, allowing the hacker to gain access to a user's confidential data.
About the Trojan:PowerShell/Boxter Research
The content we publish on SensorsTechForum.com, this Trojan:PowerShell/Boxter how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific trojan problem.
How did we conduct the research on Trojan:PowerShell/Boxter?
Please note that our research is based on an independent investigation. We are in contact with independent security researchers, thanks to which we receive daily updates on the latest malware definitions, including the various types of trojans (backdoor, downloader, infostealer, ransom, etc.)
Furthermore, the research behind the Trojan:PowerShell/Boxter threat is backed with VirusTotal.
To better understand the threat posed by trojans, please refer to the following articles which provide knowledgeable details.