Trojan.Agent.KOSB
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: | 26,666 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 3 |
| First Seen: | January 14, 2026 |
| Last Seen: | June 3, 2026 |
| OS(es) Affected: | Windows |
The detection of Trojan.Agent.KOSB on your system indicates a potential security threat that requires immediate attention. This type of threat is known to compromise the security and integrity of infected computers, making it essential to understand its nature and take appropriate removal steps.
Table of Contents
What Is Trojan.Agent.KOSB?
Trojan.Agent.KOSB is identified as a Trojan-type threat, which means it is designed to infiltrate a computer system by disguising itself as a legitimate program or file. Trojans are known for their ability to create backdoors on infected systems, allowing remote access and control by malicious actors. The name "Trojan.Agent.KOSB" suggests it is part of a broader category of Trojan agents, but without specific details, it's crucial to focus on general removal and prevention strategies.
How Trojan.Agent.KOSB Operates
Typically, Trojan-type threats like Trojan.Agent.KOSB operate by exploiting vulnerabilities in software or human behavior to gain unauthorized access to a computer system. Once inside, they can perform a variety of malicious activities, including data theft, installing additional malware, or using the infected computer as part of a botnet for distributed denial-of-service (DDoS) attacks or spamming. The exact mechanisms of Trojan.Agent.KOSB might vary, but understanding its potential capabilities is key to mitigating its impact.
Symptoms of Infection
Symptoms of an infection can be subtle and may include unusual system behavior, such as unexpected pop-ups, slow performance, or unfamiliar programs appearing on the system. Sometimes, infections may not exhibit noticeable symptoms immediately, making regular system checks and malware scans crucial for early detection. If you suspect your system has been compromised, it's essential to act quickly to minimize potential damage.
How to Remove Trojan.Agent.KOSB
- Boot into Safe Mode with Networking: This will help prevent the malware from loading and give you a cleaner environment to perform removal steps.
- Perform a Full Scan with a Reputable Tool: Utilize an anti-malware tool like SpyHunter to scan your system thoroughly. These tools are designed to detect and remove various types of malware, including Trojans.
- Uninstall Suspicious Programs: Go through your installed programs and remove any that you don't recognize or no longer need. Be cautious, as some malware may disguise itself as legitimate software.
- Reset Your Browser: If your browser (such as Chrome, Firefox, or Edge) has been affected, resetting it to its default settings can help remove malicious extensions or settings changes.
- Reboot and Re-scan: After taking the above steps, reboot your system and perform another full scan to ensure that the threat has been completely removed.
Conclusion
Removing Trojan.Agent.KOSB requires a systematic approach to ensure that all traces of the malware are eliminated from your system. By following the steps outlined above and maintaining good security practices, such as regularly updating your software and being cautious with emails and downloads, you can significantly reduce the risk of future infections. Remember, vigilance and proactive measures are key to protecting your digital assets and personal data in today's evolving cybersecurity landscape.
Analysis Report
General information
| Family Name: | Trojan.Agent.KOSB |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
fe7723047390f017e22e9f34e7bdc93f
SHA1:
f8acdbc50f46c92c2c924f4689af91890fdc2c4a
SHA256:
238D05DD650A0266F59ECE255125A3152346EE72BAD4D7B14F07537D0F9285C1
File Size:
568.32 KB, 568320 bytes
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MD5:
731e79588815ad57bfbba19bd16eafc8
SHA1:
9985c8ec17b747dba184f9db4d2eb00e010f82ca
SHA256:
117A7795A39BA53B01D39F01EA0ABA80AEC3516EBBF55FC8AB6C36E0A897085F
File Size:
568.32 KB, 568320 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have security information
- File has exports table
- File has TLS information
- File is 64-bit executable
- File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
- File is either console or GUI application
- 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)
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 | Microsoft Corporation |
| File Description | App Resolver |
| File Version |
|
| Internal Name | AppResolver.dll |
| Legal Copyright | © Microsoft Corporation. All rights reserved. |
| Original Filename | AppResolver.dll |
| Product Name | Microsoft® Windows® Operating System |
| Product Version |
|
File Traits
- dll
- 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: | 361 |
|---|---|
| Potentially Malicious Blocks: | 81 |
| Whitelisted Blocks: | 280 |
| 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.KOSB
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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