Threat Database Backdoors Backdoor.MSIL.Agent.BNH

Backdoor.MSIL.Agent.BNH

By CagedTech in Backdoors

Threat Scorecard

Popularity Rank: 6,015
Threat Level: 60 % (Medium)
Infected Computers: 141
First Seen: October 21, 2024
Last Seen: July 6, 2026
OS(es) Affected: Windows

The detection of Backdoor.MSIL.Agent.BNH on your system indicates a serious security threat that requires immediate attention. This backdoor threat can compromise the integrity of your computer, allowing unauthorized access and potentially leading to further malware infections, data theft, or other malicious activities. It is essential to understand the nature of this threat and take prompt action to remove it and secure your system.

What Is Backdoor.MSIL.Agent.BNH?

Backdoor.MSIL.Agent.BNH is identified as a backdoor threat, which means it is designed to bypass normal security mechanisms to allow unauthorized access to a computer system. Backdoors are typically used by attackers to gain control over a compromised system, execute commands, or steal sensitive information without being detected. The name suggests it is written in MSIL (Microsoft Intermediate Language), which is a platform-agnostic intermediate representation of the .NET Framework.

How Backdoor.MSIL.Agent.BNH Operates

Backdoor threats like Backdoor.MSIL.Agent.BNH usually operate by creating a covert communication channel between the compromised system and a command and control (C2) server controlled by the attacker. This channel allows the attacker to issue commands, upload or download files, and capture sensitive information from the infected system. The backdoor can be installed through various means, including exploits, phishing emails, infected software downloads, or vulnerabilities in operating systems or applications.

Symptoms of Infection

Symptoms of a backdoor infection can be subtle and may not always be immediately apparent. However, signs may include unusual network activity, slower system performance, unexpected changes in system settings, or the appearance of unfamiliar programs or files. In some cases, the system may become unstable, or certain security features may be disabled. Since backdoors are designed to be stealthy, the absence of noticeable symptoms does not necessarily mean the system is clean.

How to Remove Backdoor.MSIL.Agent.BNH

  1. Boot your computer in Safe Mode with Networking to prevent the malware from loading and to gain better control over your system for the removal process.
  2. Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system. Ensure the tool is updated with the latest definitions to effectively detect and remove Backdoor.MSIL.Agent.BNH.
  3. Uninstall any suspicious programs or applications that you do not recognize or that were installed around the time the threat was detected.
  4. Reset your web browsers (Chrome, Firefox, Edge, etc.) to their default settings to remove any malicious extensions or settings changes made by the backdoor.
  5. After completing the above steps, reboot your computer and perform another full scan with your anti-malware tool to ensure that the threat has been completely removed.

Conclusion

Removing Backdoor.MSIL.Agent.BNH from your system is crucial to prevent further damage and protect your personal data. Following the steps outlined above should help in the removal process. However, preventing future infections is equally important. This can be achieved by keeping your operating system and software up to date, using strong, unique passwords, being cautious with email attachments and downloads, and regularly scanning your system for malware. Staying informed about the latest threats and security practices is also key to maintaining a secure computing environment.

Analysis Report

General information

Family Name: Backdoor.MSIL.Agent.BNH
Signature status: No Signature

Known Samples

MD5: 38734881ed5fc8363825adf2a3ed0e4a
SHA1: 66dd82ac60322307772aad3635dc7a6973dc33cc
SHA256: B45B421813A7C4BC83792AAB683145F07BC91EAAB66D576F2AF2D8B85DDFBE0A
File Size: 256.51 KB, 256512 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have security information
  • File has exports table
  • File is .NET application
  • File is 64-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)
  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Icons

File Traits

  • .NET
  • 2+ executable sections
  • HighEntropy
  • No Version Info
  • WriteProcessMemory
  • x64

Block Information

Total Blocks: 87
Potentially Malicious Blocks: 19
Whitelisted Blocks: 68
Unknown Blocks: 0

Visual Map

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

Similar Families

  • MSIL.Agent.BNH
  • MSIL.Spy.Agent.AOB
  • MSIL.Spy.Agent.OAA

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlertThreadByThreadId
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtApphelpCacheControl
  • ntdll.dll!NtClearEvent
  • ntdll.dll!NtClose
  • ntdll.dll!NtCreateEvent
  • ntdll.dll!NtCreateMutant
  • ntdll.dll!NtCreatePrivateNamespace
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtCreateSemaphore
Show More
  • ntdll.dll!NtCreateThreadEx
  • ntdll.dll!NtDeviceIoControlFile
  • 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!NtOpenSection
  • 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!NtQueryInformationThread
  • 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!NtQueryWnfStateData
  • ntdll.dll!NtReadFile
  • ntdll.dll!NtReadRequestData
  • ntdll.dll!NtReleaseMutant
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtResumeThread
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationKey
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationThread
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSetInformationWorkerFactory
  • 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
  • ntdll.dll!NtYieldExecution
  • UNKNOWN
User Data Access
  • GetComputerNameEx
  • GetUserDefaultLocaleName
  • GetUserObjectInformation
Encryption Used
  • BCryptOpenAlgorithmProvider
Anti Debug
  • IsDebuggerPresent
Other Suspicious
  • AdjustTokenPrivileges

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