Threat Database Trojans Trojan.MSIL.Downloader.AFFE

Trojan.MSIL.Downloader.AFFE

By CagedTech in Trojans

Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 1
First Seen: December 2, 2025
Last Seen: February 2, 2026
OS(es) Affected: Windows

The detection of Trojan.MSIL.Downloader.AFFE indicates that a potentially malicious program has been identified on your system. This name suggests a type of Trojan horse malware, which is designed to deceive users into installing it by disguising itself as a legitimate program. Trojans can cause significant harm to your system and data, making it essential to understand the nature of this threat and take immediate action to remove it.

What Is Trojan.MSIL.Downloader.AFFE?

Trojan.MSIL.Downloader.AFFE is a type of malware that falls under the broader category of Trojan horses. Trojans are malicious programs that can allow unauthorized access to your system, steal sensitive information, or disrupt system operations. The ".MSIL" part of the name might indicate that the malware is written in Microsoft Intermediate Language, which is a platform-agnostic intermediate representation of the .NET Common Intermediate Language. The term "Downloader" suggests that this malware might be capable of downloading additional malicious components from the internet, potentially leading to further system compromise.

How Trojan.MSIL.Downloader.AFFE Operates

Once installed, Trojan.MSIL.Downloader.AFFE can operate in various ways to achieve its malicious goals. It may connect to command and control servers to receive instructions or download additional malware. This could lead to the installation of other types of malware, such as ransomware, spyware, or keyloggers, each designed to perform specific malicious functions. The malware might also attempt to hide its presence by disguising itself as a legitimate process or by exploiting system vulnerabilities to evade detection.

Symptoms of Infection

Systems infected with Trojan.MSIL.Downloader.AFFE may exhibit a range of symptoms, although some infections may remain asymptomatic until significant damage is done. Common indicators of a Trojan infection include unexpected system crashes, slow system performance, unfamiliar programs or icons, and unusual network activity. You might also notice that your browser homepage has changed, or you are being redirected to unwanted websites. In some cases, the malware might trigger security alerts from your antivirus software, although sophisticated malware can sometimes evade detection.

How to Remove Trojan.MSIL.Downloader.AFFE

  1. Boot your system into Safe Mode with Networking to limit the malware's ability to interfere with the removal process. This mode allows you to use the internet to download removal tools while limiting the execution of malicious programs.
  2. Download and install a reputable anti-malware tool, such as SpyHunter, which can scan your system for the Trojan and other malware. Perform a full system scan to identify all malicious components.
  3. Uninstall any suspicious programs that were installed around the time you noticed the infection. Be cautious and only remove programs you are certain are malicious or unnecessary.
  4. Reset your web browsers (Chrome, Firefox, Edge) to their default settings to remove any malicious extensions or settings changes made by the Trojan.
  5. Reboot your system and perform another full scan with your anti-malware tool to ensure that all components of the Trojan have been removed. Repeat this process until no more threats are detected.

Conclusion

Removing Trojan.MSIL.Downloader.AFFE requires a systematic approach to ensure that all malicious components are eliminated from your system. It's crucial to act quickly to prevent further damage and to protect your sensitive information. After removal, consider taking steps to secure your system, such as updating your operating system and software, using strong antivirus protection, and being cautious with email attachments and downloads from the internet. By understanding the nature of Trojan horses and taking proactive measures, you can significantly reduce the risk of future infections and maintain a secure computing environment.

Analysis Report

General information

Family Name: Trojan.MSIL.Downloader.AFFE
Signature status: No Signature

Known Samples

MD5: 674be29ff8c21f4ed8f5840877ecd845
SHA1: 09b0a0d82fdcb62e0aa77c1d85d5ae64135bb291
SHA256: B1890506E1E6400996818DB0BBFC1A7DDA3108AD078D2C5C05E64A8976996F5A
File Size: 729.60 KB, 729600 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have exports table
  • File doesn't have relocations information
  • File doesn't have security information
  • 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)
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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
Comments CTF Loadder
Company Name Microsoft Corporation
File Description CTF Loadder
File Version 1.0.0.0
Internal Name load.exe
Legal Copyright Copyright © 2025
Original Filename load.exe
Product Name CTF Loadder
Product Version 1.0.0.0

File Traits

  • .NET
  • x64

Block Information

Total Blocks: 12
Potentially Malicious Blocks: 8
Whitelisted Blocks: 4
Unknown Blocks: 0

Visual Map

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

Similar Families

  • MSIL.Downloader.AFFE

Files Modified

File Attributes
c:\users\user\appdata\local\load\update\security.exe Generic Write,Read Attributes

Windows API Usage

Category API
Syscall Use
  • 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!NtCreateThreadEx
  • ntdll.dll!NtDeviceIoControlFile
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  • ntdll.dll!NtDuplicateObject
  • ntdll.dll!NtEnumerateKey
  • ntdll.dll!NtEnumerateValueKey
  • ntdll.dll!NtFlushProcessWriteBuffers
  • 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!NtOpenSymbolicLinkObject
  • 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!NtQuerySymbolicLinkObject
  • 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!NtSubscribeWnfStateChange
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForAlertByThreadId
  • ntdll.dll!NtWaitForMultipleObjects
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitForWorkViaWorkerFactory
  • ntdll.dll!NtWorkerFactoryWorkerReady
  • ntdll.dll!NtWriteFile
  • ntdll.dll!NtYieldExecution
  • UNKNOWN
User Data Access
  • GetComputerNameEx
  • GetUserDefaultLocaleName
  • GetUserObjectInformation
Anti Debug
  • IsDebuggerPresent
Encryption Used
  • BCryptOpenAlgorithmProvider

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