Trojan.Agent.NSB
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: | 2 |
| First Seen: | May 9, 2026 |
| Last Seen: | October 16, 2026 |
| OS(es) Affected: | Windows |
Trojan.Agent.NSB is a dangerous Windows-based Trojan horse that operates covertly on infected systems, giving remote attackers the ability to take control of a victim's computer. With a danger level rated 8 out of 10, this threat is classified as a serious risk that can lead to data loss, financial harm, and further malware infections. It has been observed targeting Windows machines, and its activity has continued to be tracked over several months, indicating it remains an active threat in the wild.
Table of Contents
What Trojan.Agent.NSB Does
Once Trojan.Agent.NSB manages to install itself on a computer, it runs silently in the background, avoiding obvious signs of its presence. This stealth behavior allows it to carry out malicious actions without alerting the user. According to its known behavior, Agent.NSB can give hackers complete remote control over an infected system. This level of access means attackers can potentially execute commands, manipulate files, and use the compromised machine for further malicious purposes.
The Trojan is also capable of covertly deleting files and installing additional malware onto the system. This secondary payload capability is particularly concerning, as it means an initial infection by Agent.NSB can quickly escalate into a much larger security problem, with other threats such as spyware, ransomware, or password-stealing malware being dropped onto the compromised machine.
How It Usually Gets Onto Computers
Trojan.Agent.NSB typically spreads through deceptive means rather than self-replication. Common infection vectors include software downloads from malicious or compromised websites, as well as email attachments sent from untrusted or unknown sources. These attachments may be disguised using file extensions such as .exe, .pif, .avi, or even .jpg, tricking users into believing they are opening a harmless file when in fact they are executing malicious code.
The Trojan may also exploit existing system vulnerabilities and security flaws to install itself without requiring direct user interaction. This means that keeping software and the operating system up to date is an important defense, as attackers often target known, unpatched weaknesses to gain a foothold.
Risks for the User
The risks associated with Trojan.Agent.NSB are significant. Because it can grant attackers full control over an infected system, victims may face unauthorized access to personal files, exposure of sensitive data, and the silent installation of additional malicious programs. The deletion of files by the Trojan can also result in permanent data loss. In short, a system compromised by this Trojan can no longer be considered secure or private until it is fully cleaned.
Signs of Infection
Because Trojan.Agent.NSB is designed to run silently, it may not produce obvious symptoms. However, users should be alert to unexpected system slowdowns, unfamiliar processes running in the background, files disappearing without explanation, or new unrecognized programs appearing on the system. Unusual network activity or unexpected changes in system behavior can also be warning signs worth investigating.
How to Stay Protected
To reduce the risk of infection, users should avoid downloading software from untrustworthy or unofficial websites and refrain from opening email attachments from unknown or suspicious senders, regardless of the file extension shown. Keeping the Windows operating system and all installed software updated with the latest security patches is essential, as this helps close vulnerabilities that threats like Agent.NSB attempt to exploit. Maintaining regular backups of important files, exercising caution with unsolicited emails, and using reputable security tools to scan downloads before opening them are all practical steps toward staying protected against this and similar Trojan threats.
Analysis Report
General information
| Family Name: | Trojan.Agent.NSB |
|---|---|
| Signature status: | Self Signed |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
32ea8e010dae33d4ec56ed4ca6dbf940
SHA1:
14b5b366494048f04b1bb8cd036a4560095ad288
SHA256:
EC89705F0220E31338604623A000AEB3E39E3F43748A37B1241FFBD099F595D2
File Size:
5.75 MB, 5747328 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 resources
- 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)
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 |
|---|---|---|
| www.agreen.nl | www.agreen.nl | Self Signed |
File Traits
- golang
- No Version Info
- 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: | 863 |
|---|---|
| Potentially Malicious Blocks: | 1 |
| Whitelisted Blocks: | 862 |
| Unknown Blocks: | 0 |
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.- Agent.NSB
- Filecoder.KEB
- Filecoder.KEC
- Filecoder.KEE
- PSW.Agent.TD
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- ReverseShell.B
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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