Trojan.Agent.MUB
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) |
| First Seen: | April 11, 2026 |
| Last Seen: | October 23, 2026 |
| OS(es) Affected: | Windows |
Trojan.Agent.MUB is a Windows-based Trojan horse classified as a high-risk threat, with a danger rating of 8 out of 10. Like other members of the "Agent" Trojan family, it is designed to infiltrate a computer quietly, avoid detection, and carry out harmful background activity without the user's knowledge or consent. Once active, it can give remote attackers significant control over an infected system, making it a serious concern for both home users and businesses.
Table of Contents
What Trojan.Agent.MUB Does
Once installed, Trojan.Agent.MUB runs silently in the background, often without displaying any windows or obvious indicators to the user. It is built as a native 64-bit Windows application and does not rely on an external packer, but it does exhibit high entropy in parts of its code, a trait commonly associated with hidden or obfuscated functionality. Behind the scenes, it interacts directly with low-level Windows system components, including functions used to read and write files, manage memory, query process information, and access the Windows registry. This level of access can allow the Trojan to gather information about the infected system, modify files, and communicate with other processes.
Trojans in this category typically allow attackers to gain extensive control over the compromised machine. This can include covertly deleting files, downloading and installing additional malware, logging keystrokes, stealing sensitive data, or opening backdoors that let cybercriminals access the system remotely. The Trojan also includes anti-debugging checks, a technique commonly used by malware to detect when it is being analyzed by security researchers, which helps it evade detection and analysis.
How It Usually Gets Onto Computers
Trojan.Agent.MUB typically spreads through deceptive means rather than by exploiting a single specific vulnerability. Common infection methods for this type of threat include downloading software from untrustworthy or malicious websites, opening email attachments from unknown or untrusted senders, and exploiting unpatched security flaws in the operating system or installed applications. Disguised file types such as .exe, .pif, .avi, or even seemingly harmless .jpg files are often used to trick users into executing the malicious payload without realizing it.
Risks for the User
The presence of Trojan.Agent.MUB on a system poses serious risks. Because it can grant attackers remote control, victims may face data theft, financial loss, identity theft, or further malware infections. The Trojan's ability to delete files and install additional malicious software can lead to system instability, data loss, and a compromised security posture that is difficult to fully remediate without proper cleanup.
Signs of Infection
Because Trojans are designed to operate stealthily, infections can be difficult to notice. However, users may observe unusual system behavior such as unexpected slowdowns, unfamiliar processes running in the background, unexplained changes to files or settings, increased network activity, or the appearance of unknown programs. In some cases, security software may flag suspicious files or registry activity associated with the threat.
How to Stay Protected
To reduce the risk of infection, users should avoid downloading software from untrusted or unofficial websites and refrain from opening email attachments from unknown senders. Keeping the operating system and all installed applications fully updated helps close security gaps that Trojans like this one may try to exploit. Maintaining regular backups of important files, using a reputable security solution to scan for threats, and exercising caution when encountering unexpected files, especially those with unusual extensions, are all important steps in defending against this type of threat.
Analysis Report
General information
| Family Name: | Trojan.Agent.MUB |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
3083f26ca71f890b4d047a1219ae480c
SHA1:
71897a803ee619d95ca13ad6be49557872bda211
SHA256:
00158BFF8C2C286CA6F177A20526D32357DCFF35DB4E7DDE1AE8B8F3E0215997
File Size:
7.32 MB, 7318016 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- File doesn't have security information
- File has TLS information
- File is 64-bit executable
- File is either console or GUI application
- File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
- File is Native application (NOT .NET 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)
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 |
|---|---|
| Company Name | ryuu |
| File Description | RyuuManifestToolV2 |
| File Version | 1.4.0 |
| Product Name | RyuuManifestToolV2 |
| Product Version | 1.4.0 |
File Traits
- HighEntropy
- ntdll
- x64
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: | 17,219 |
|---|---|
| Potentially Malicious Blocks: | 1,138 |
| Whitelisted Blocks: | 15,688 |
| Unknown Blocks: | 393 |
Visual Map
... Data truncated? - 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.- Agent.MUB
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 |
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| Anti Debug |
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| User Data Access |
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