Backdoor.Quasar.CB
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: | August 19, 2025 |
| Last Seen: | August 28, 2025 |
| OS(es) Affected: | Windows |
The detection of Backdoor.Quasar.CB on your system indicates a potential security threat that requires immediate attention. This backdoor threat can compromise your system's security and allow unauthorized access to your data. 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.CB?
Backdoor.Quasar.CB is a type of malware that allows unauthorized access to a compromised system. It can enable hackers to remotely control the system, steal sensitive information, and install additional malware. The name "Backdoor" refers to the malware's ability to bypass normal security mechanisms and create a secret entrance to the system. The specifics of how Backdoor.Quasar.CB operates and its potential impact on a system can vary, but its primary function is to provide unauthorized access to the system and its data.
How Backdoor.Quasar.CB Operates
Backdoor malware like Backdoor.Quasar.CB typically operates by exploiting vulnerabilities in the system or tricking users into installing it. Once installed, it can create a communication channel with its command and control server, allowing hackers to send commands and receive stolen data. The malware can also spread through infected software downloads, phishing emails, or exploited vulnerabilities in the system. Understanding how backdoor malware operates is crucial in taking steps to prevent and remove such threats.
Symptoms of Infection
The symptoms of a Backdoor.Quasar.CB infection can be subtle and may not always be immediately apparent. However, some common signs of a backdoor infection include unusual network activity, slow system performance, and unexplained changes to system settings. If you suspect that your system is infected, it is essential to take immediate action to remove the malware and prevent further damage.
- Unusual network activity, such as unexpected outgoing connections
- Slow system performance or crashes
- Unexplained changes to system settings or files
- Appearance of unknown or suspicious programs
How to Remove Backdoor.Quasar.CB
- Boot your system in Safe Mode with Networking to prevent the malware from loading and to allow for internet access for updates and scans.
- Perform a full scan of your system using a reputable anti-malware tool, such as SpyHunter, to detect and remove the malware.
- Uninstall any suspicious programs that may be related to the malware infection.
- Reset your web browsers, including Chrome, Firefox, and Edge, to their default settings to remove any malicious extensions or settings.
- Reboot your system and perform another full scan to ensure that the malware has been completely removed.
Conclusion
Removing Backdoor.Quasar.CB from your system requires careful and immediate action. By following the steps outlined above and maintaining good security practices, such as keeping your software up to date and being cautious when clicking on links or downloading attachments, you can help prevent future infections and protect your system and data from malicious threats. Remember, staying informed and proactive is key to maintaining the security and integrity of your digital environment.
Analysis Report
General information
| Family Name: | Backdoor.Quasar.CB |
|---|---|
| Signature status: | Self Signed |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
6f466e3ccc706fceee22e59c82d8ae4d
SHA1:
77e1562210aa02b0ee36238df99db54e4a43aad0
SHA256:
C93563925DCCF65CA2870DBEBEBB5F4CB37857C70508383583CF1D1F911981EB
File Size:
1.89 MB, 1891808 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- 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)
- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Icons
File Icons
This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.
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 |
|---|---|---|
| RxSTV | RxSTV | Self Signed |
File Traits
- HighEntropy
- No Version Info
- 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: | 824 |
|---|---|
| Potentially Malicious Blocks: | 3 |
| Whitelisted Blocks: | 821 |
| 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.XFM
- BadJoke.XA
- Quasar.CB
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 |
|
| Anti Debug |
|
| Encryption Used |
|
