Backdoor.Quasar.BC
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: | 60 % (Medium) |
| Infected Computers: | 1 |
| First Seen: | September 16, 2025 |
| Last Seen: | April 12, 2026 |
| OS(es) Affected: | Windows |
The detection of Backdoor.Quasar.BC on your system indicates a serious security threat that requires immediate attention. This backdoor threat can potentially allow unauthorized access to your computer, compromising your personal data and system security. It is essential to understand the nature of this threat and take prompt action to remove it and prevent future infections.
Table of Contents
What Is Backdoor.Quasar.BC?
Backdoor.Quasar.BC is a type of malware that creates a secret entrance to your computer, allowing hackers to remotely access and control your system without your knowledge or consent. This backdoor can be used to steal sensitive information, install additional malware, or use your computer as a botnet to launch attacks on other systems. The name Backdoor.Quasar.BC itself does not directly indicate a specific malware family, but rather describes the nature of the threat.
How Backdoor.Quasar.BC Operates
Backdoor.Quasar.BC operates by exploiting vulnerabilities in your system or tricking you into installing it through deceptive means, such as disguising itself as a legitimate program or attachment. Once installed, it can communicate with its command and control servers to receive instructions and send stolen data. This malware can also spread through infected software downloads, infected websites, or infected USB drives.
Symptoms of Infection
Symptoms of a Backdoor.Quasar.BC infection can be subtle, but they may include unusual network activity, slow system performance, or unfamiliar programs running in the background. You may also notice that your system is behaving erratically, such as crashing or freezing frequently. However, some backdoors can operate without displaying any noticeable symptoms, making them difficult to detect without proper security software.
- Unexplained changes to system settings or files
- Appearance of unfamiliar programs or icons
- Increased network activity when no programs are running
- Frequent system crashes or freezes
How to Remove Backdoor.Quasar.BC
- Boot your computer in Safe Mode with Networking to prevent the malware from loading and to allow for a clean environment to perform removal steps.
- Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system. This will help detect and remove all traces of the malware.
- Uninstall any suspicious programs that you do not recognize or that were installed around the time of the infection.
- Reset your web browsers, such as Chrome, Firefox, or Edge, to their default settings to remove any malicious extensions or settings changes made by the malware.
- Reboot your computer and perform another full scan with your anti-malware tool to ensure that all remnants of the malware have been removed.
Conclusion
Removing Backdoor.Quasar.BC requires careful and thorough steps to ensure that all components of the malware are eliminated from your system. It is crucial to stay vigilant and keep your security software up to date to prevent future infections. Regularly scanning your system, avoiding suspicious downloads, and being cautious with email attachments and links can help protect you from similar threats. By following the removal steps outlined above and maintaining good security practices, you can help secure your computer and protect your personal data from malicious activities.
Analysis Report
General information
| Family Name: | Backdoor.Quasar.BC |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
65b620c56aeebd056e1c56af6fd16c55
SHA1:
5aadf7d4065b954cbdfacb004f6a7aaa0037a1dc
SHA256:
DEAA1206069DD3BF68D65B0A5C71D0AC87F63663B31221082EA035E5DDE0D174
File Size:
2.11 MB, 2108416 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 doesn't have security 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
Show More
- IMAGE_FILE_DLL is not set inside PE header (Executable)
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
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: | 4,369 |
|---|---|
| Potentially Malicious Blocks: | 0 |
| Whitelisted Blocks: | 4,369 |
| 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.USC
- Dropper.FFA
- Trojan.Filecoder.Gen.BD
- Trojan.ShellcodeRunner.Gen.FI
- Trojan.ShellcodeRunner.Gen.IW
Show More
- Trojan.ShellcodeRunner.Gen.LG
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
|
| Network Winsock2 |
|
