Threat Database Trojans Trojan.MSIL.Spy.Agent.GFB

Trojan.MSIL.Spy.Agent.GFB

By CagedTech in Trojans

Threat Scorecard

Popularity Rank: 12,793
Threat Level: 80 % (High)
Infected Computers: 6
First Seen: April 18, 2026
Last Seen: July 12, 2026
OS(es) Affected: Windows

The detection of Trojan.MSIL.Spy.Agent.GFB indicates that a potentially malicious program has been identified on your system. This detection name suggests that the malware in question may be related to spyware, which is designed to gather sensitive information from infected computers without the users' knowledge or consent. It is essential to address this issue promptly to prevent potential harm to your personal data and system security.

What Is Trojan.MSIL.Spy.Agent.GFB?

Trojan.MSIL.Spy.Agent.GFB is a type of malware that may be capable of spying on infected systems, potentially stealing sensitive information such as login credentials, browsing history, and other personal data. The name "Trojan" refers to the fact that this malware may disguise itself as a legitimate program or hide within other software to gain unauthorized access to a computer system. The "MSIL" part of the name suggests that the malware is written in Microsoft Intermediate Language, which is a programming language used by the .NET Framework.

How Trojan.MSIL.Spy.Agent.GFB Operates

Malware like Trojan.MSIL.Spy.Agent.GFB typically operates by exploiting vulnerabilities in software or tricking users into installing it. Once installed, it may attempt to connect to a command and control server to receive instructions or transmit stolen data. The exact mechanisms used by this specific malware are not publicly known, but it is likely that it uses common spyware tactics such as keylogging, screen scraping, or intercepting network traffic to gather sensitive information.

Symptoms of Infection

Systems infected with Trojan.MSIL.Spy.Agent.GFB may exhibit a range of symptoms, including slow system performance, frequent crashes, or unusual network activity. Users may also notice that their browsers are being redirected to unwanted websites, or that their search results are being altered. In some cases, the malware may attempt to disguise itself as a legitimate program, making it difficult to detect without the use of specialized security software.

  • Unexplained changes to system settings or browser configurations
  • Appearance of unwanted programs or toolbars
  • Increased risk of identity theft or financial fraud

How to Remove Trojan.MSIL.Spy.Agent.GFB

  1. Boot your system in Safe Mode with Networking to prevent the malware from loading and to allow for internet access to download removal tools.
  2. Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system and identify all components of the malware.
  3. Uninstall any suspicious programs that were installed around the time of the infection, as these may be related to the malware.
  4. Reset your web browsers (Chrome, Firefox, Edge) to their default settings to remove any malicious extensions or add-ons.
  5. Reboot your system and perform another full scan with your anti-malware tool to ensure that all remnants of the malware have been removed.

Conclusion

Removing Trojan.MSIL.Spy.Agent.GFB from an infected system requires careful attention to detail and the use of specialized security software. By following the steps outlined above and maintaining good security practices, such as keeping software up to date and avoiding suspicious downloads, you can help protect your system from future infections and prevent the potential harm caused by spyware and other types of malware.

Analysis Report

General information

Family Name: Trojan.MSIL.Spy.Agent.GFB
Signature status: No Signature

Known Samples

MD5: 4c682d82940d3a31b8c8eb00c81f3a9e
SHA1: 535a7565c0107a08093945599b4a89fd8e46e8e0
SHA256: BC18012194F4EB06D3217D25C524F1B99A34590F40B4E3A8F5FA84822D2DE022
File Size: 48.64 KB, 48640 bytes
MD5: ffaf989b3f60ee6dfea834c0fdbc5e87
SHA1: 292de020a3dad1c6fad991bb541202e0e6114135
SHA256: FBBA9E5859C643AE662DF0A40C8D341B1BFE5086984849ECBD405DC00F1123A2
File Size: 43.01 KB, 43008 bytes
MD5: 6ea9cc7c7c85ac0baf5da6654324c9db
SHA1: d3c2717ef24b306097e9dedc5071de96cf995bf8
SHA256: 96604F7E8E8786421C1F5A14FA94D039627CA8F408AB1985263E442E879B599E
File Size: 45.06 KB, 45056 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 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)
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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
Company Name System.Spy.Lib
File Description System.Spy.Lib
File Version 1.0.0.0
Internal Name System.Spy.Lib.dll
Original Filename System.Spy.Lib.dll
Product Name System.Spy.Lib
Product Version 1.0.0

File Traits

  • .NET
  • dll
  • ntdll
  • x86

Block Information

Total Blocks: 91
Potentially Malicious Blocks: 39
Whitelisted Blocks: 49
Unknown Blocks: 3

Visual Map

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

Similar Families

  • MSIL.Spy.Agent.GFB

Registry Modifications

Key::Value Data API Name
HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 Ll �v����Bx(�1`1�1HO@V�A��H[uN$k`k�q�P���!���� ���3������m���V�$�8���l��&M�~B1_`�V������Q]��@K�A*�"C��| RegNtPreCreateKey

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
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  • 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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