Trojan.MSIL.Downloader.UAA
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.
| Popularity Rank: | 18,548 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 113 |
| First Seen: | January 22, 2022 |
| Last Seen: | July 1, 2026 |
| OS(es) Affected: | Windows |
Trojan.MSIL.Downloader.UAA is a detection for a downloader trojan written for the Microsoft .NET (MSIL) framework. As the name suggests, its core job is to act as a delivery mechanism: once it runs on a Windows system, it contacts a remote server and downloads and installs additional malware chosen by the attacker.
SpyHunter's threat database actively detects files that match this signature. Files flagged under this detection are typically unsigned executables.
Table of Contents
What Is a Downloader Trojan?
A downloader is a first-stage threat. It is deliberately small and simple so it can slip past defenses, and its value to attackers is the follow-on payloads it fetches — which can include information stealers, banking trojans, ransomware, or remote-access tools. Because the second-stage payload is chosen server-side, two identical downloader infections can result in completely different outcomes.
How It Spreads
Downloader trojans typically arrive through phishing email attachments, malicious links, fake software downloads, and cracked applications. Behavioral analysis of this sample shows system-call activity and access to user data, consistent with a component that stages further infection.
What Trojan.MSIL.Downloader.UAA Does
- Payload delivery: downloads and executes additional malware from a remote server.
- System profiling: gathers basic information to guide which payloads are delivered.
- Stealth: the unsigned .NET binary is built to run quietly in the background.
Symptoms of Infection
- New, unfamiliar programs appearing shortly after the initial infection.
- Unexpected network connections and background processes.
- Degraded performance or security software being disabled.
Why It Is Dangerous
A downloader is dangerous precisely because it is a gateway: it turns a single intrusion into whatever the attacker wants next. The Threat Scorecard and Analysis Report on this page show how SpyHunter's systems rank and observe this threat's behavior.
How to Remove Trojan.MSIL.Downloader.UAA
Because this threat runs as a file-based Windows infection, removal has two goals: stop the malicious process and delete every component it dropped, then confirm nothing was left behind to reinstall it.
Manual Steps
- Disconnect the computer from the internet to cut the malware off from its command-and-control server.
- Restart Windows in Safe Mode with Networking so the threat is not loaded at startup.
- Open Task Manager and end any unfamiliar or suspicious background processes.
- Check Settings → Apps and uninstall any program you do not recognize or did not intentionally install.
- Review startup entries (Task Manager → Startup) and the
Runregistry keys for entries that point to random file names in temporary folders. - Clear temporary files to remove staging copies of the payload.
Recommended: Run a Full Malware Scan
Manual removal is difficult because modern threats hide components and can restore themselves. The most reliable way to fully remove Trojan.MSIL.Downloader.UAA and any additional malware it may have downloaded is to scan the system with a professional, up-to-date anti-malware tool such as SpyHunter. A complete scan will detect and remove the threat's files, registry entries, and related infections, helping restore the device to a clean, secure state.
Conclusion
Trojan.MSIL.Downloader.UAA exists to invite more malware onto your system. Because it may already have pulled down additional payloads, remove it promptly and run a full security scan to find and eliminate anything it may have installed.
Analysis Report
General information
| Family Name: | Trojan.MSIL.Downloader.UAA |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
a9fb62a79e4ea5741271d0a950d2e86b
SHA1:
cd0149c87a61b9631dcfc35634776e4c2726a224
SHA256:
EA236799EF98DFFD2001B3A1DEE51C34E8D7EB49DD1378122380FC502E6F2632
File Size:
2.53 MB, 2527744 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 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)
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Icons
File Icons
This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.
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 |
|---|---|
| Assembly Version | 1.0.0.0 |
| Company Name | v2rayN |
| File Description | v2rayN |
| File Version | 6.21 |
| Internal Name | v2rayN.dll |
| Legal Copyright | Copyright © 2017-2023 (GPLv3) |
| Original Filename | v2rayN.dll |
| Product Name | v2rayN |
| Product Version | 1.0.0 |
File Traits
- .NET
- Agile.net
- Fody
- 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: | 1,298 |
|---|---|
| Potentially Malicious Blocks: | 51 |
| Whitelisted Blocks: | 766 |
| Unknown Blocks: | 481 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
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 |
|---|---|
| Syscall Use |
Show More
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| User Data Access |
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