Trojan.MSIL.Downloader.KFB
Threat Scorecard
EnigmaSoft Threat Scorecard
EnigmaSoft Threat Scorecards are assessment reports for different malware threats which have been collected and analyzed by our research team. EnigmaSoft Threat Scorecards evaluate and rank threats using several metrics including real-world and potential risk factors, trends, frequency, prevalence, and persistence. EnigmaSoft Threat Scorecards are updated regularly based on our research data and metrics and are useful for a wide range of computer users, from end users seeking solutions to remove malware from their systems to security experts analyzing threats.
EnigmaSoft Threat Scorecards display a variety of useful information, including:
Popularity Rank: The ranking of a particular threat in EnigmaSoft’s Threat Database.
Severity Level: The determined severity level of an object, represented numerically, based on our risk modeling process and research, as explained in our Threat Assessment Criteria.
Infected Computers: The number of confirmed and suspected cases of a particular threat detected on infected computers as reported by SpyHunter.
See also Threat Assessment Criteria.
| Threat Level: | 80 % (High) |
| Infected Computers: | 4 |
| First Seen: | September 9, 2025 |
| Last Seen: | October 21, 2025 |
| OS(es) Affected: | Windows |
The detection of Trojan.MSIL.Downloader.KFB indicates that your system has been compromised by a type of malicious software. This report aims to provide you with general guidance on understanding and removing the threat. It's essential to approach malware removal with caution and follow best practices to minimize potential damage.
Table of Contents
What Is Trojan.MSIL.Downloader.KFB?
Trojan.MSIL.Downloader.KFB is a type of Trojan horse malware, which is a broad category of malicious software that disguises itself as legitimate programs. The name suggests it's a downloader Trojan, designed to download and install additional malware on the infected system. Trojan horses can be particularly dangerous because they often require user interaction to activate, making them seem harmless until it's too late.
How Trojan.MSIL.Downloader.KFB Operates
Trojan.MSIL.Downloader.KFB, like other downloader Trojans, is likely designed to connect to command and control servers to download and execute additional malicious payloads. This can lead to a variety of harmful activities, including data theft, ransomware attacks, or the installation of other types of malware such as spyware, adware, or more Trojans. The specific operations of Trojan.MSIL.Downloader.KFB can vary, but its primary goal is to compromise the security and integrity of the infected system.
Symptoms of Infection
Identifying a Trojan infection can be challenging because these malware types often do not exhibit obvious symptoms. However, some common indicators of a malware infection include unexpected pop-ups, slow system performance, unfamiliar programs or toolbars, and unusual network activity. If you suspect your system has been infected, it's crucial to take immediate action to mitigate the damage and remove the malware.
How to Remove Trojan.MSIL.Downloader.KFB
- Enter 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 necessary tools while minimizing the risk of the Trojan reconnecting to its command and control servers.
- Perform a full scan of your system using a reputable anti-malware tool, such as SpyHunter. Ensure the tool is updated with the latest definitions to improve the chances of detecting and removing the malware.
- Uninstall suspicious programs that you do not recognize or that were installed around the time the malware was detected. Be cautious and only remove programs you are sure are not essential to your system's operation.
- Reset your web browsers, including Chrome, Firefox, and Edge, to their default settings. This can help remove any malicious extensions or settings that the malware may have installed.
- After completing the above steps, reboot your system and perform another full scan with your anti-malware tool to ensure that the malware has been completely removed.
Conclusion
Removing Trojan.MSIL.Downloader.KFB requires careful and methodical steps to ensure the malware is completely eradicated from your system. It's also important to take preventive measures to avoid future infections, such as keeping your operating system and software up to date, using strong antivirus software, and being cautious when opening email attachments or downloading software from the internet. By following these guidelines and staying informed, you can protect your system from the evolving landscape of cyber threats.
Analysis Report
General information
| Family Name: | Trojan.MSIL.Downloader.KFB |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
98a5287e7191381e754324195c89e47e
SHA1:
5c6d73fde4a622e5d82dec6530d22f93dabeaafa
SHA256:
FD836A9934E5BE2E5B950F9943E09F6EE344318D4F10D78F4E6146B6585F3EE1
File Size:
18.71 KB, 18712 bytes
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MD5:
7af9f7564d6c1ecd336d583979e9a14f
SHA1:
2e8af3b3557156e243e68d122db7b353b0915ab1
SHA256:
3807F58440FABF0E05841A72AE27A3141E1A317B27484C4EF345B7CA78738B8B
File Size:
1.44 MB, 1441280 bytes
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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 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
Windows PE Version Information
This section displays values and attributes that have been set in the Windows file version information data structure for samples within this family. To mislead users, malware actors often add fake version information mimicking legitimate software.| Name | Value |
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| Assembly Version |
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| File Description |
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| File Version |
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| Internal Name |
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| Legal Copyright |
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| Original Filename |
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| Product Name |
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| Product Version |
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Digital Signatures
Digital Signatures
This section lists digital signatures that are attached to samples within this family. When analyzing and verifying digital signatures, it is important to confirm that the signature’s root authority is a well-known and trustworthy entity and that the status of the signature is good. Malware is often signed with non-trustworthy “Self Signed” digital signatures (which can be easily created by a malware author with no verification). Malware may also be signed by legitimate signatures that have an invalid status, and by signatures from questionable root authorities with fake or misleading “Signer” names.| Signer | Root | Status |
|---|---|---|
| Telegram FZ-LLC | GlobalSign GCC R45 EV CodeSigning CA 2020 | Hash Mismatch |
File Traits
- .NET
- HighEntropy
- x86
Block Information
Block Information
During analysis, EnigmaSoft breaks file samples into logical blocks for classification and comparison with other samples. Blocks can be used to generate malware detection rules and to group file samples into families based on shared source code, functionality and other distinguishing attributes and characteristics. This section lists a summary of this block data, as well as its classification by EnigmaSoft. A visual representation of the block data is also displayed, where available.| Total Blocks: | 71 |
|---|---|
| Potentially Malicious Blocks: | 3 |
| Whitelisted Blocks: | 56 |
| Unknown Blocks: | 12 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
Similar Families
Similar Families
This section lists other families that share similarities with this family, based on EnigmaSoft’s analysis. Many malware families are created from the same malware toolkits and use the same packing and encryption techniques but uniquely extend functionality. Similar families may also share source code, attributes, icons, subcomponents, compromised and/or invalid digital signatures, and network characteristics. Researchers leverage these similarities to rapidly and effectively triage file samples and extend malware detection rules.- MSIL.Downloader.KFB
Files Modified
Files Modified
This section lists files that were created, modified, moved and/or deleted by samples in this family. File system activity can provide valuable insight into how malware functions on the operating system.| File | Attributes |
|---|---|
| c:\users\user\appdata\roaming\current.exe | Generic Read,Write Data,Write Attributes,Write extended,Append data,Delete,LEFT 262144 |
| c:\users\user\appdata\roaming\microsoft\windows\start menu\programs\startup\current.vbs | Generic Write,Read Attributes |
Registry Modifications
Registry Modifications
This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.| Key::Value | Data | API Name |
|---|---|---|
| HKLM\software\wow6432node\microsoft\tracing::enableconsoletracing | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::enablefiletracing | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::enableautofiletracing | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::enableconsoletracing | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::filetracingmask | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::consoletracingmask | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::maxfilesize | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasapi32::filedirectory | %windir%\tracing | RegNtPreCreateKey |
| HKLM\software\wow6432node\microsoft\tracing\rasmancs::enablefiletracing | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasmancs::enableautofiletracing | RegNtPreCreateKey |
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| HKLM\software\wow6432node\microsoft\tracing\rasmancs::enableconsoletracing | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasmancs::filetracingmask | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasmancs::consoletracingmask | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasmancs::maxfilesize | RegNtPreCreateKey | |
| HKLM\software\wow6432node\microsoft\tracing\rasmancs::filedirectory | %windir%\tracing | RegNtPreCreateKey |
Windows API Usage
Windows API Usage
This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.| Category | API |
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| User Data Access |
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| Anti Debug |
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| Other Suspicious |
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| Network Winsock2 |
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| Network Winsock |
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| Network Winhttp |
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| Network Info Queried |
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| Encryption Used |
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