Trojan.Injector.JUB
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: | 24,964 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 1 |
| First Seen: | October 23, 2025 |
| Last Seen: | September 26, 2026 |
| OS(es) Affected: | Windows |
Trojan.Injector.JUB is identified as a Trojan, a category of malicious software designed to infiltrate computers while disguising its true purpose or hiding inside what looks like a harmless file or process. As with most threats in the Trojan.Injector family, its core function is to insert or "inject" malicious code into legitimate running processes on an infected system, allowing it to carry out harmful activity while evading detection. Specific details such as the exact origin, infection date, and full technical profile of this particular variant are not publicly documented, so this article focuses on the general behavior typical of Injector-type Trojans and how users can protect themselves.
Table of Contents
What This Threat Does
Trojans in the Injector family typically work by embedding their malicious code into trusted system processes or applications that are already running on the computer. By doing this, the malware can operate under the cover of a legitimate process, making it harder for users and some security tools to notice anything unusual. Once active, this type of Trojan may be used to download additional malicious components, modify system settings, collect information from the infected device, or provide a backdoor that allows remote attackers to control certain functions of the computer. The exact payload and goals can vary between variants, but the injection technique itself is the defining characteristic of this threat family.
How It Usually Gets Onto Computers
Like most Trojans, Injector-type threats commonly spread through deceptive methods rather than self-replication. Typical infection routes include malicious email attachments, links in phishing messages, bundled downloads from untrustworthy websites, cracked or pirated software, fake software updates, and compromised advertisements. Users are often tricked into manually running the infected file, believing it to be something legitimate, such as a document, installer, or media file.
Risks for the User
Because Injector Trojans embed themselves into trusted processes, they can be particularly risky. Potential consequences include theft of personal or financial information, unauthorized remote access to the device, installation of further malware, degraded system performance, and exposure of sensitive data stored on the machine. In some cases, infected systems may also be used as part of a larger network of compromised devices without the owner's knowledge.
Signs of Infection
Since this type of Trojan is designed to operate quietly, visible symptoms are not always obvious. However, users may notice warning signs such as:
- Unexpected slowdowns or high resource usage without a clear cause
- Unfamiliar processes running in the task manager
- Security software being disabled or unable to update
- Unusual network activity or unexpected outbound connections
- New or unknown programs appearing on the system
- Changes to browser settings or the appearance of unwanted pop-ups
How to Stay Protected
Reducing the risk of infection from Trojans like this one involves following sound security habits. Keep the operating system and all installed software up to date, since outdated programs can contain vulnerabilities that malware exploits. Avoid downloading software from unofficial or unverified sources, and be cautious with email attachments and links from unknown senders. Regularly back up important files, use strong and unique passwords, and run periodic system scans with reputable security tools. Staying alert to unusual system behavior and acting quickly if something seems off can also help limit the damage caused by this type of threat.
Analysis Report
General information
| Family Name: | Trojan.Injector.JUB |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
a577814d13c6ee8c193e5313363d6c8f
SHA1:
5de8adff680dd83942d15041904f27a18148853c
SHA256:
89AA5EF4988A7B8E5A3CDE0D2633A294CF682318B2FB761BED6F55F942C5A0C4
File Size:
155.65 KB, 155648 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- File doesn't have resources
- File doesn't have security information
- File is 32-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)
Show More
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Traits
- fptable
- HighEntropy
- No Version Info
- WriteProcessMemory
- 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: | 681 |
|---|---|
| Potentially Malicious Blocks: | 3 |
| Whitelisted Blocks: | 674 |
| Unknown Blocks: | 4 |
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.MYSR
- Agent.XRH
- KeyLogger.KIA
- Trojan.Agent.Gen.FEJ
- Trojan.Agent.Gen.FGI
Show More
- Trojan.Kryptik.Gen.IVR
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\local\iusb3mon.exe | Generic Read,Write Data,Write Attributes,Write extended,Append data,Delete,LEFT 262144 |
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 |
|---|---|
| User Data Access |
|
| Process Manipulation Evasion |
|
| Process Shell Execute |
|
Shell Command Execution
Shell Command Execution
This section lists Windows shell commands that are run by the samples in this family. Windows Shell commands are often leveraged by malware for nefarious purposes and can be used to elevate security privileges, download and launch other malware, exploit vulnerabilities, collect and exfiltrate data, and hide malicious activity.
C:\Users\Ngohgjpo\AppData\Local\iusb3mon.exe (NULL)
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