Threat Database Trojans Trojan.MSIL.Njrat.J

Trojan.MSIL.Njrat.J

By CagedTech in Trojans

Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 0
First Seen: September 29, 2025
OS(es) Affected: Windows

The detection of Trojan.MSIL.Njrat.J on your system indicates a potential security threat that requires immediate attention. This report provides an overview of the threat, its operating methods, symptoms of infection, and a step-by-step guide on how to remove it from your system.

What Is Trojan.MSIL.Njrat.J?

Trojan.MSIL.Njrat.J is a type of malware that can compromise the security and integrity of your computer system. The name suggests it is a Trojan-type threat, which typically disguises itself as legitimate software to gain unauthorized access to a computer. Trojans can be used to steal sensitive information, install additional malware, or provide a backdoor for remote access by an attacker.

How Trojan.MSIL.Njrat.J Operates

Malware like Trojan.MSIL.Njrat.J often operates by exploiting vulnerabilities in software or tricking users into installing it. Once installed, it can execute a variety of malicious actions, including but not limited to, data theft, keylogging, and the installation of additional malicious software. The specific operations of Trojan.MSIL.Njrat.J can vary, but its primary goal is to compromise your system's security and privacy.

Symptoms of Infection

Symptoms of a Trojan infection can be subtle and may not always be immediately apparent. Common signs include unusual system behavior, such as unexpected pop-ups, slow system performance, and unfamiliar programs or icons. You might also experience difficulties with your internet connection or notice that your system settings have been altered without your consent. Since Trojans can act as backdoors, you might not notice any symptoms at all until significant damage has been done.

How to Remove Trojan.MSIL.Njrat.J

  1. Enter Safe Mode with Networking: Restart your computer and enter Safe Mode. This will limit the malware's ability to interfere with the removal process and allow you to download necessary tools.
  2. Conduct a Full Scan: Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system. This can help identify and remove the Trojan and any associated malware.
  3. Uninstall Suspicious Programs: Go through your installed programs and uninstall any that you do not recognize or that were installed around the time your system became infected.
  4. Reset Your Browser: If your browser (such as Chrome, Firefox, or Edge) has been affected, reset it to its default settings. This can help remove any malicious extensions or settings changes made by the malware.
  5. Reboot and Re-scan: After completing the above steps, reboot your system and perform another full scan with your anti-malware tool to ensure that the threat has been fully removed.

Conclusion

Removing Trojan.MSIL.Njrat.J from your system requires careful and thorough action. By following the steps outlined above and maintaining vigilance through regular system scans and updates, you can help protect your system against future threats. Remember, prevention is key; keeping your operating system, software, and security tools up to date, along with practicing safe browsing habits, can significantly reduce the risk of malware infections.

Analysis Report

General information

Family Name: Trojan.MSIL.Njrat.J
Signature status: No Signature

Known Samples

MD5: ef9d7c9140be950e8f68af63e6a7a82e
SHA1: e726e6d5325427bd1ec6b5236eaedfc7639640fc
SHA256: EB3F803C94B6AC69D022A5143700450F27E5369B7FD31A11733E504E0B9DCB19
File Size: 91.65 KB, 91648 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have debug information
  • File doesn't have exports table
  • File doesn't have security information
  • File is .NET application
  • File is 32-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
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  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

Windows PE Version Information

Name Value
Assembly Version 1.0.0.0
File Description Setup
File Version 1.0.0.0
Internal Name Setup.exe
Legal Copyright Copyright © 2025
Original Filename Setup.exe
Product Name Setup
Product Version 1.0.0.0

File Traits

  • .NET
  • Installer Version
  • RijndaelManaged
  • WriteProcessMemory
  • x86

Block Information

Total Blocks: 50
Potentially Malicious Blocks: 7
Whitelisted Blocks: 43
Unknown Blocks: 0

Visual Map

x 0 x 0 0 0 0 0 0 0 0 0 0 0 x x x 0 x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x 0 0 0 0 0 0 0 0 0
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

  • MSIL.Agent.FBK
  • MSIL.Agent.PI
  • MSIL.Gamehack.BOWB
  • MSIL.Gamehack.BOWD
  • MSIL.Njrat.J
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  • Quasar.I

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlertThreadByThreadId
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtClearEvent
  • ntdll.dll!NtClose
  • ntdll.dll!NtCreateEvent
  • ntdll.dll!NtCreateFile
  • ntdll.dll!NtCreateMutant
  • ntdll.dll!NtCreatePrivateNamespace
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtCreateThreadEx
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  • ntdll.dll!NtDuplicateObject
  • ntdll.dll!NtEnumerateKey
  • ntdll.dll!NtEnumerateValueKey
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
  • ntdll.dll!NtOpenDirectoryObject
  • ntdll.dll!NtOpenEvent
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenKeyEx
  • ntdll.dll!NtOpenProcess
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtOpenThreadToken
  • ntdll.dll!NtProtectVirtualMemory
  • ntdll.dll!NtQueryAttributesFile
  • ntdll.dll!NtQueryDefaultLocale
  • ntdll.dll!NtQueryDirectoryFileEx
  • ntdll.dll!NtQueryFullAttributesFile
  • ntdll.dll!NtQueryInformationFile
  • ntdll.dll!NtQueryInformationJobObject
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQueryKey
  • ntdll.dll!NtQueryLicenseValue
  • ntdll.dll!NtQueryPerformanceCounter
  • ntdll.dll!NtQuerySecurityAttributesToken
  • ntdll.dll!NtQuerySecurityObject
  • ntdll.dll!NtQuerySystemInformation
  • ntdll.dll!NtQuerySystemInformationEx
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtReadFile
  • ntdll.dll!NtReleaseMutant
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtResumeThread
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationKey
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationWorkerFactory
  • ntdll.dll!NtSubscribeWnfStateChange
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForAlertByThreadId
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitForWorkViaWorkerFactory
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWriteFile
  • UNKNOWN
User Data Access
  • GetComputerNameEx
  • GetUserObjectInformation

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