Threat Database Trojans Trojan.MSIL.ShellcodeRunner.B

Trojan.MSIL.ShellcodeRunner.B

By CagedTech in Trojans

Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 3
First Seen: July 27, 2021
Last Seen: August 31, 2025
OS(es) Affected: Windows

The detection of Trojan.MSIL.ShellcodeRunner.B on your system indicates a potential security threat that requires immediate attention. This type of malware is designed to compromise the security and integrity of your computer, allowing unauthorized access and control. It is essential to understand the nature of this threat and take prompt action to remove it and prevent further damage.

What Is Trojan.MSIL.ShellcodeRunner.B?

Trojan.MSIL.ShellcodeRunner.B is a type of Trojan horse malware that uses shellcode to execute malicious instructions on a compromised system. The term "Trojan" refers to the fact that this malware disguises itself as legitimate software, allowing it to evade detection and gain unauthorized access to the system. The "MSIL" part of the name suggests that the malware is written in Microsoft Intermediate Language, which is a platform-agnostic intermediate representation of code. The "ShellcodeRunner" component implies that the malware is designed to execute shellcode, which is a small piece of code that is used to exploit vulnerabilities in the system.

How Trojan.MSIL.ShellcodeRunner.B Operates

Once installed on a system, Trojan.MSIL.ShellcodeRunner.B can operate in a variety of ways, depending on its intended purpose. It may be designed to steal sensitive information, such as login credentials or financial data, or to install additional malware on the system. It may also be used to create a backdoor, allowing remote access to the system, or to participate in a botnet, which is a network of compromised computers that can be controlled remotely. The exact operation of Trojan.MSIL.ShellcodeRunner.B will depend on the specific goals of the attackers who created it.

Symptoms of Infection

The symptoms of a Trojan.MSIL.ShellcodeRunner.B infection can vary, but may include unusual system behavior, such as slow performance, crashes, or unexplained changes to system settings. You may also notice that your system is connecting to unfamiliar websites or that your antivirus software is detecting and blocking suspicious activity. In some cases, the malware may not exhibit any obvious symptoms, making it difficult to detect without the use of specialized security software.

How to Remove Trojan.MSIL.ShellcodeRunner.B

  1. Boot your system in Safe Mode with Networking to prevent the malware from loading and to allow you to download and install removal tools.
  2. Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system and detect and remove any malware that is present.
  3. Uninstall any suspicious programs that may be related to the malware, taking care to follow the uninstallation instructions carefully to ensure that all components are removed.
  4. Reset your web browsers, including Chrome, Firefox, and Edge, to their default settings to remove any malware that may have infected them.
  5. Reboot your system and perform a follow-up scan to ensure that the malware has been completely removed.

Conclusion

The removal of Trojan.MSIL.ShellcodeRunner.B requires careful attention to detail and a thorough understanding of the malware's operation. By following the steps outlined above and using reputable security software, you can help to protect your system and prevent further damage. It is essential to remain vigilant and to take steps to prevent future infections, such as keeping your operating system and software up to date, using strong passwords, and avoiding suspicious downloads and email attachments.

Analysis Report

General information

Family Name: Trojan.MSIL.ShellcodeRunner.B
Signature status: No Signature

Known Samples

MD5: 945851a10ed3f5e96d51593d3a73e15a
SHA1: 71ad0aec9179bfee7ab59ab36e8218a5ea481d23
SHA256: 4383921552CEC80A31B4B48B3E17D3900CB0B225A039E28D10D83B7A3BE1551D
File Size: 21.50 KB, 21504 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have exports table
  • File doesn't have security information
  • File is .NET application
  • File is 32-bit executable
  • File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
  • File is either console or GUI application
  • 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)

Windows PE Version Information

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

File Traits

  • .NET
  • dll
  • ntdll
  • WriteProcessMemory
  • x86

Block Information

Total Blocks: 32
Potentially Malicious Blocks: 13
Whitelisted Blocks: 11
Unknown Blocks: 8

Visual Map

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

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAccessCheck
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtApphelpCacheControl
  • ntdll.dll!NtClose
  • ntdll.dll!NtConnectPort
  • ntdll.dll!NtCreateMutant
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtDuplicateToken
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
Show More
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenKeyEx
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtOpenProcessTokenEx
  • ntdll.dll!NtOpenSection
  • ntdll.dll!NtOpenSemaphore
  • ntdll.dll!NtOpenThreadTokenEx
  • ntdll.dll!NtProtectVirtualMemory
  • ntdll.dll!NtQueryAttributesFile
  • ntdll.dll!NtQueryDebugFilterState
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationThread
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQueryKey
  • ntdll.dll!NtQueryPerformanceCounter
  • ntdll.dll!NtQuerySecurityAttributesToken
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtQueryWnfStateData
  • ntdll.dll!NtReleaseMutant
  • ntdll.dll!NtReleaseSemaphore
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtRequestWaitReplyPort
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtSetInformationVirtualMemory
  • ntdll.dll!NtSubscribeWnfStateChange
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWriteFile
  • ntdll.dll!NtWriteVirtualMemory
  • win32u.dll!NtGdiBitBlt
  • win32u.dll!NtGdiCreateBitmap
  • win32u.dll!NtGdiCreateCompatibleDC
  • win32u.dll!NtGdiCreateDIBitmapInternal
  • win32u.dll!NtGdiCreateSolidBrush
  • win32u.dll!NtGdiDeleteObjectApp
  • win32u.dll!NtGdiExtGetObjectW
  • win32u.dll!NtGdiGetDCforBitmap
  • win32u.dll!NtGdiGetDCObject
  • win32u.dll!NtGdiGetDeviceCaps
  • win32u.dll!NtGdiRestoreDC
  • win32u.dll!NtGdiSaveDC
  • win32u.dll!NtGdiSelectBitmap
  • win32u.dll!NtGdiSetDIBitsToDeviceInternal
  • win32u.dll!NtUserBuildHwndList
  • win32u.dll!NtUserCallTwoParam
  • win32u.dll!NtUserCreateEmptyCursorObject
  • win32u.dll!NtUserCreateWindowEx
  • win32u.dll!NtUserDestroyWindow
  • win32u.dll!NtUserFindExistingCursorIcon
  • win32u.dll!NtUserGetAncestor
  • win32u.dll!NtUserGetClassInfoEx
  • win32u.dll!NtUserGetClassName
  • win32u.dll!NtUserGetDC
  • win32u.dll!NtUserGetGUIThreadInfo
  • win32u.dll!NtUserGetIconInfo
  • win32u.dll!NtUserGetIconSize
  • win32u.dll!NtUserGetImeInfoEx
  • win32u.dll!NtUserGetKeyboardLayout
  • win32u.dll!NtUserGetObjectInformation
  • win32u.dll!NtUserGetProcessWindowStation
  • win32u.dll!NtUserGetProp
  • win32u.dll!NtUserGetThreadDesktop
  • win32u.dll!NtUserGetThreadState
  • win32u.dll!NtUserGetWindowCompositionAttribute
  • win32u.dll!NtUserIsNonClientDpiScalingEnabled
  • win32u.dll!NtUserIsTopLevelWindow
  • win32u.dll!NtUserMessageCall
  • win32u.dll!NtUserRegisterClassExWOW
  • win32u.dll!NtUserRegisterWindowMessage
  • win32u.dll!NtUserReleaseDC
  • win32u.dll!NtUserRemoveProp
  • win32u.dll!NtUserSelectPalette
  • win32u.dll!NtUserSetCursorIconData
  • win32u.dll!NtUserSetWindowFNID
  • win32u.dll!NtUserSetWindowLongPtr
  • win32u.dll!NtUserSetWindowPos
  • win32u.dll!NtUserUpdateInputContext

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