Trojan.Quasar.S
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: | 80 % (High) |
| Infected Computers: | 20 |
| First Seen: | May 12, 2025 |
| Last Seen: | March 5, 2026 |
| OS(es) Affected: | Windows |
The detection of Trojan.Quasar.S on your system indicates a potential security threat that requires immediate attention. This type of malware is designed to compromise the security and integrity of your computer, and it's essential to understand its nature and take steps to remove it. In this report, we will provide an overview of Trojan.Quasar.S, its operating methods, symptoms of infection, and a step-by-step guide on how to remove it from your system.
Table of Contents
What Is Trojan.Quasar.S?
Trojan.Quasar.S is a type of Trojan horse malware that can sneak into your system unnoticed and perform malicious activities without your knowledge or consent. The name "Trojan" refers to the malware's ability to disguise itself as a legitimate program or file, making it difficult to detect. Trojan.Quasar.S can be used to steal sensitive information, install additional malware, or provide unauthorized access to your system.
How Trojan.Quasar.S Operates
Trojan.Quasar.S operates by exploiting vulnerabilities in your system or using social engineering tactics to trick you into installing it. Once installed, it can communicate with its command and control servers to receive instructions and transmit stolen data. The malware can also install additional components, such as keyloggers or rootkits, to further compromise your system. Trojan.Quasar.S can be difficult to detect, as it can masquerade as a legitimate program or run in the background without displaying any noticeable symptoms.
Symptoms of Infection
While Trojan.Quasar.S can be stealthy, there are some common symptoms that may indicate its presence on your system. These include:
- Unexplained changes to your system settings or configuration
- Slow system performance or frequent crashes
- Unusual network activity or unfamiliar programs running in the background
- Pop-ups, ads, or other unwanted content appearing on your screen
- Difficulty accessing certain files or programs
It's essential to note that these symptoms can also be caused by other factors, so a thorough scan and analysis are necessary to confirm the presence of Trojan.Quasar.S.
How to Remove Trojan.Quasar.S
To remove Trojan.Quasar.S from your system, follow these steps:
- Boot your system in Safe Mode with Networking to prevent the malware from loading
- Use a reputable anti-malware tool, such as SpyHunter, to perform a full scan of your system and detect any malicious components
- Uninstall any suspicious programs or applications that may be related to the malware
- Reset your web browsers, including Chrome, Firefox, and Edge, to their default settings to remove any malicious extensions or add-ons
- Reboot your system and perform another scan to ensure that all remnants of the malware have been removed
It's crucial to be thorough and patient during the removal process, as Trojan.Quasar.S can be persistent and difficult to eliminate.
Conclusion
In conclusion, the detection of Trojan.Quasar.S on your system is a serious security issue that requires immediate attention. By understanding its nature and following the steps outlined in this report, you can remove the malware and restore the security and integrity of your system. Remember to always use reputable anti-malware tools, keep your operating system and software up to date, and practice safe computing habits to minimize the risk of infection. If you're unsure about any aspect of the removal process, consider seeking the help of a professional or contacting a trusted security expert for guidance.
Analysis Report
General information
| Family Name: | Trojan.Quasar.S |
|---|---|
| Signature status: | Hash Mismatch |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
4c3e32881322d451fa1ad2c894611536
SHA1:
bbedfc1683c7087c7e52d496bc4819b1db1ab4a5
SHA256:
6545CF1E775DB98DF7F4654DFB1A57124747D9AFFBC6DC94D3ABA4D47EB7A486
File Size:
1.90 MB, 1901464 bytes
|
|
MD5:
2f549e0d15d0d1906358c1fff9606a3b
SHA1:
13388ad7d58a4e0dd9e86c82b46ea88383abd8b1
SHA256:
F3E9B2873E8D1D16868E5E4D327DCEB0167FBF8C7CA262ED4BB21FB243100047
File Size:
2.22 MB, 2221704 bytes
|
|
MD5:
2f8718e2ad5a1bd31ca0553ed950bfec
SHA1:
18fe5d53834c124f89a721b6baba176fcc001b2d
SHA256:
3DAAF2392A0C72C38AF89953B6BAB9754C2D3EF3E7132C4DA9838D8BEC11F575
File Size:
2.01 MB, 2010920 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have debug information
- File doesn't have 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)
- 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.
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 |
|---|---|
| Comments | Visit http://www.winamp.com/ for updates. |
| Company Name |
|
| File Description | Winamp Installer |
| File Version |
|
| Internal Name | Razer Installer.exe |
| Legal Copyright |
|
| Legal Trademarks | Nullsoft and Winamp are trademarks of Winamp SA |
| Original Filename | Razer Installer.exe |
| Product Name |
|
| Product Version |
|
| Special Build | full |
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 |
|---|---|---|
| Razer USA Ltd. | DigiCert Trusted Root G4 | Hash Mismatch |
| Winamp SA | DigiCert Trusted Root G4 | Hash Mismatch |
| JetBrains s.r.o. | Entrust Code Signing Root Certification Authority - CSBR1 | Hash Mismatch |
File Traits
- golang
- Installer Version
- 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: | 2,644 |
|---|---|
| Potentially Malicious Blocks: | 14 |
| Whitelisted Blocks: | 2,592 |
| Unknown Blocks: | 38 |
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.- Lumma.AU
- Mikey.U
- Rozena.CY
- ShellcodeRunner.AYA
- ShellcodeRunner.TF
Show More
- ShellcodeRunner.TO
- Shlem.C
- SmokeLoader.C
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
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