Threat Database Trojans Trojan.MSIL.Webshell.BS

Trojan.MSIL.Webshell.BS

By CagedTech in Trojans

Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 7
First Seen: July 26, 2024
Last Seen: March 6, 2026
OS(es) Affected: Windows

The detection of Trojan.MSIL.Webshell.BS on your system indicates a potential security threat that requires immediate attention. This report aims to provide you with a comprehensive understanding of the threat, its operation, symptoms, and most importantly, the steps to remove it from your computer. It's crucial to approach this situation with a clear understanding of the risks and the necessary actions to protect your data and system integrity.

What Is Trojan.MSIL.Webshell.BS?

Trojan.MSIL.Webshell.BS is identified as a Trojan-type threat. Trojans are malicious programs that can cause significant harm to your computer system. They are designed to allow unauthorized access to the victim's system, enabling attackers to steal sensitive information, install additional malware, or use the infected computer for malicious activities. The name suggests it might involve webshell capabilities, which could imply a method for remote access and control of the infected system through web interfaces.

How Trojan.MSIL.Webshell.BS Operates

Trojan.MSIL.Webshell.BS, like other Trojans, operates by disguising itself as legitimate software. Once installed on a system, it can open a backdoor, allowing hackers to access the system remotely. This access can be used for a variety of malicious purposes, including data theft, installing ransomware or other types of malware, and using the system as part of a botnet for distributed denial-of-service (DDoS) attacks or spamming. The specifics of how Trojan.MSIL.Webshell.BS operates can vary, but its primary goal is to provide unauthorized access to the system.

Symptoms of Infection

Identifying a Trojan infection can be challenging because these malware types are designed to remain stealthy. However, some common symptoms may indicate the presence of a Trojan like Trojan.MSIL.Webshell.BS. These include unusual system behavior, such as unexpected crashes, slow performance, or unfamiliar programs running in the background. Additionally, if you notice unusual network activity, such as increased data usage or unfamiliar connections, it could be a sign of a Trojan infection. Sometimes, Trojans may also trigger security software alerts or warnings about suspicious activity.

How to Remove Trojan.MSIL.Webshell.BS

  1. Enter Safe Mode with Networking: Restart your computer and enter Safe Mode with Networking. This will allow you to use the internet while limiting the malware's ability to run.
  2. Full Scan with a Reputable Tool: 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 other malware that might be present.
  3. Uninstall Suspicious Programs: Go through your installed programs and uninstall anything that looks suspicious or unfamiliar. Be cautious, as some legitimate programs might have similar names to malware.
  4. Reset Browsers: Reset your web browsers (e.g., Chrome, Firefox, Edge) to their default settings. This can help remove any malicious extensions or settings that the Trojan might have installed.
  5. Reboot and Re-scan: 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 fully removed.

Conclusion

Removing Trojan.MSIL.Webshell.BS requires careful and immediate action to prevent further damage to your system and protect your personal data. By following the steps outlined in this report, you can effectively remove the threat and secure your computer. It's also essential to practice good cybersecurity habits, such as regularly updating your operating system and software, using strong antivirus protection, and being cautious when opening emails or downloading software from the internet. Remember, prevention and vigilance are key to maintaining the security and integrity of your digital environment.

Analysis Report

General information

Family Name: Trojan.MSIL.Webshell.BS
Signature status: No Signature

Known Samples

MD5: 90feb6fb989ab27335cde9c3d10d1b15
SHA1: e2b49287a496b0efe4269f2da23f92e60b131328
SHA256: 755B9C2108364DAC99BCEC4BD79650D1D5DF79BFF04937E5BB80DBD51D1749C0
File Size: 265.73 KB, 265728 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)

File Traits

  • .NET
  • dll
  • x86

Block Information

Total Blocks: 601
Potentially Malicious Blocks: 32
Whitelisted Blocks: 279
Unknown Blocks: 290

Visual Map

x 0 0 ? ? ? ? ? ? ? ? ? ? ? ? x ? ? ? ? ? ? ? ? ? ? ? ? ? ? x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? x ? ? ? ? ? ? ? ? ? ? ? ? ? 0 0 0 0 ? ? ? ? ? ? ? 0 ? ? ? 0 ? ? 0 ? ? ? ? ? ? x ? ? 0 ? ? ? ? ? ? ? ? ? ? ? ? ? 0 ? ? ? ? ? ? ? 0 0 x 0 0 ? ? 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 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 ? 0 0 0 0 0 0 0 x 0 0 0 0 x 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 0 0 0 0 0 0 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 x 0 0 0 0 x 0 0 0 0 0 0 0 0 0 0 x 0 0 0 0 0 0 0 0 0 0 ? ? x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 0 0 x ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? x x 0 ? ? ? ? ? ? ? ? ? ? ? ? ? ? x ? ? ? ? ? ? ? ? ? 0 ? 0 ? ? ? ? ? ? ? ? ? ? ? ? x ? ? ? x x 0 ? 0 ? 0 0 ? ? 0 ? ? 0 ? ? 0 ? ? 0 0 ? ? x 0 ? ? ? ? x 0 ? x 0 ? x ? ? 0 0 ? 0 ? ? ? ? ? ? ? ? ? ? ? ? ? ? 0 ? ? 0 ? ? x 0 ? ? ? 0 ? ? x 0 ? ? ? ? ? ? ? x ? ? ? ? ? x 0 ? ? ? ? 0 x ? 0 0 x 0 0 0 ? ? ? 0 ? ? ? ? ? ? 0 ? ? ? 0 0 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!NtSetInformationWorkerFactory
  • ntdll.dll!NtSubscribeWnfStateChange
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWriteFile
  • UNKNOWN

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