Trojan.Downloader.FSB
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: | 10,331 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 32 |
| First Seen: | September 6, 2025 |
| Last Seen: | July 5, 2026 |
| OS(es) Affected: | Windows |
The detection of Trojan.Downloader.FSB indicates that a potentially malicious program has been identified on your system. This type of threat is generally categorized as a Trojan, which is a broad term for malicious software that disguises itself as legitimate. The name Trojan.Downloader.FSB suggests that it may be involved in downloading additional malicious components, but without specific details, it's essential to approach removal with a comprehensive strategy.
Table of Contents
What Is Trojan.Downloader.FSB?
Trojan.Downloader.FSB, by its name, implies a connection to Trojan horses, which are malicious programs that deceive users into installing them by masquerading as useful software. The ".Downloader" part of the name suggests it may have the capability to download additional malware or components from the internet, potentially increasing its malicious capabilities over time. Understanding the nature of this threat is crucial for taking appropriate removal steps.
How Trojan.Downloader.FSB Operates
Generally, Trojans like Trojan.Downloader.FSB operate by exploiting user trust or system vulnerabilities to gain unauthorized access to a computer. Once installed, they can perform a variety of malicious actions, including but not limited to, downloading and installing additional malware, stealing sensitive information, or providing backdoor access to hackers. The specific operations of Trojan.Downloader.FSB would depend on its design and the intentions of its creators, but the potential for harm is significant.
Symptoms of Infection
Symptoms of a Trojan.Downloader.FSB infection can vary widely, depending on the malware's goals and how it interacts with the infected system. Common signs include unexpected changes to system settings, unusual network activity, slow system performance, and the appearance of unwanted programs or pop-ups. In some cases, the infection may not exhibit noticeable symptoms immediately, making regular system monitoring and antivirus scans crucial for early detection.
How to Remove Trojan.Downloader.FSB
- Boot your computer in Safe Mode with Networking to limit the malware's ability to interfere with the removal process.
- Perform a full scan of your system using a reputable antivirus tool, such as SpyHunter, to detect and remove all associated malware components.
- Manually uninstall any suspicious programs that were installed around the time of the infection. Be cautious and only remove programs you are certain are malicious or unnecessary.
- Reset your web browsers (e.g., Chrome, Firefox, Edge) to their default settings to remove any malicious extensions or settings changes made by the malware.
- After completing the above steps, reboot your computer and perform another full system scan to ensure that all malware components have been removed.
Conclusion
The removal of Trojan.Downloader.FSB requires careful attention to detail and a systematic approach to ensure that all components of the malware are eliminated. It's also important to take preventive measures to avoid future infections, such as keeping your operating system and software up to date, using strong antivirus protection, and being cautious when downloading and installing software from the internet. By understanding the nature of the threat and taking proactive steps, you can protect your system and data from malicious activities.
Analysis Report
General information
| Family Name: | Trojan.Downloader.FSB |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
d04b2a9cb67ff8bff9968eb4b22e2e87
SHA1:
a2fc036dd0aa35c9a3a1c94fbdc30d798acd778d
SHA256:
9AEA233B85310937F6667F79B9210B0745D9B0BEF93D75FA8F545BC993F8B50D
File Size:
330.75 KB, 330752 bytes
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MD5:
b0827e73bafe1613f0150a537e42c0e5
SHA1:
aebf5663d3eed72d1405566b7a35c9719b9cbc6c
SHA256:
DD0B634862EEEA6A5ABD63A6CE60A399ADDB6D263BADF90259DBA1020EB198F6
File Size:
316.42 KB, 316416 bytes
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MD5:
ad3fff6aedbde97b699306c6ce6f0d92
SHA1:
b387415bce20143f326ff68679f20a7e97c986e9
SHA256:
1FBFB4FE419042479A1AE999C1686E0B9C2454EFE7B2CE48A26836FE1DC7EFC9
File Size:
300.54 KB, 300544 bytes
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Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- File doesn't have security information
- File has exports table
- 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)
Show More
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Traits
- dll
- fptable
- No Version Info
- ntdll
- WriteProcessMemory
- 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: | 1,045 |
|---|---|
| Potentially Malicious Blocks: | 7 |
| Whitelisted Blocks: | 997 |
| Unknown Blocks: | 41 |
Visual Map
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0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block
? - 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.KFSN
- Agent.UFR
- Malex.N
- Trojan.Agent.Gen.ASD
- Trojan.Agent.Gen.BL
Show More
- Trojan.Agent.Gen.BT
- Trojan.Agent.Gen.FN
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 |
|---|---|
| \\?\volume{a7c706ea-0000-0000-0000-100000000000}\boot\bcd | Read Data,Read Control,Write Data |
| \\?\volume{a7c706ea-0000-0000-0000-100000000000}\boot\bcd | Write Attributes |
| c:\windows\diagerr.xml | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\windows\diagwrn.xml | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\windows\setupact.log | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\windows\setuperr.log | Generic Read,Write Data,Write Attributes,Write extended,Append data |
Registry Modifications
Registry Modifications
This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.| Key::Value | Data | API Name |
|---|---|---|
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | ࢇ㴘쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 쵋㴜쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | ᡟ㵩쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | ᡟ㵩쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 矴㷈쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 矴㷈쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 뀊㸁쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 뀊㸁쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 駮㸬쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | ﮹㸮쒘ǜ | RegNtPreCreateKey |
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| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 㹙쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 䡮㹜쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 㒼㺇쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 阃㺉쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 罼㺴쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | 㺶쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 챼㻡쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | ⸶㻤쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\cmd.exe | 똭㼌쒘ǜ | RegNtPreCreateKey |
| HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe | ᢎ㼏쒘ǜ | RegNtPreCreateKey |
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
3 additional items are not displayed above. |
| Process Manipulation Evasion |
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| Process Shell Execute |
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| Anti Debug |
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| User Data Access |
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| Network Winsock2 |
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| Network Winsock |
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| Network Icmp |
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| Process Terminate |
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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.
cmd.exe /c ping -n 1 -w 1000 8.8.8.8 > nul
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C:\WINDOWS\system32\PING.EXE ping -n 1 -w 1000 8.8.8.8
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cmd.exe /C reagentc /disable
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C:\WINDOWS\system32\ReAgentc.exe reagentc /disable
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WriteConsole: REAGENTC.EXE: Wi
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cmd.exe /C takeown /F "%SystemRoot%\System32\reagentc.exe"
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C:\WINDOWS\system32\takeown.exe takeown /F "C:\WINDOWS\System32\reagentc.exe"
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WriteConsole: ERROR:
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WriteConsole: This stream is n
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cmd.exe /C powercfg /change monitor-timeout-ac 0
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C:\WINDOWS\system32\powercfg.exe powercfg /change monitor-timeout-ac 0
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WriteConsole: Access is denied
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cmd.exe /C powercfg /change monitor-timeout-dc 0
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C:\WINDOWS\system32\powercfg.exe powercfg /change monitor-timeout-dc 0
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cmd.exe /C powercfg /change standby-timeout-ac 0
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C:\WINDOWS\system32\powercfg.exe powercfg /change standby-timeout-ac 0
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cmd.exe /C powercfg /change standby-timeout-dc 0
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C:\WINDOWS\system32\powercfg.exe powercfg /change standby-timeout-dc 0
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cmd.exe /C powercfg /change hibernate-timeout-ac 0
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C:\WINDOWS\system32\powercfg.exe powercfg /change hibernate-timeout-ac 0
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cmd.exe /C powercfg /change hibernate-timeout-dc 0
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C:\WINDOWS\system32\powercfg.exe powercfg /change hibernate-timeout-dc 0
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cmd.exe /C powercfg /hibernate off
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C:\WINDOWS\system32\powercfg.exe powercfg /hibernate off
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