QuasarRAT

Posted: August 30, 2016

Threat Metric

The Threat Meter is a malware assessment that SpywareRemove.com's research team is able to give every identifiable malware threat. Our Threat Meter includes several criteria based off of specific malware threats to value their severity, reach and volume. The Threat Meter is able to give you a numerical breakdown of each threat's initial Threat Level, Detection Count, Volume Count, Trend Path and Percentage Impact. The overall ranking of each threat in the Threat Meter is a basic breakdown of how all threats are ranked within our own extensive malware database. The scoring for each specific malware threat can be easily compared to other emerging threats to draw a contrast in its particular severity. The Threat Meter is a useful tool in the endeavor of seeking a solution to remove a threat or pursue additional analytical research for all types of computer users.

The following fields listed on the Threat Meter containing a specific value, are explained in detail below:

Threat Level: The threat level scale goes from 1 to 10 where 10 is the highest level of severity and 1 is the lowest level of severity. Each specific level is relative to the threat's consistent assessed behaviors collected from SpyHunter's risk assessment model.

Detection Count: The collective number of confirmed and suspected cases of a particular malware threat. The detection count is calculated from infected PCs retrieved from diagnostic and scan log reports generated by SpyHunter.

Volume Count: Similar to the detection count, the Volume Count is specifically based on the number of confirmed and suspected threats infecting systems on a daily basis. High volume counts usually represent a popular threat but may or may not have infected a large number of systems. High detection count threats could lay dormant and have a low volume count. Criteria for Volume Count is relative to a daily detection count.

Trend Path: The Trend Path, utilizing an up arrow, down arrow or equal symbol, represents the level of recent movement of a particular threat. Up arrows represent an increase, down arrows represent a decline and the equal symbol represent no change to a threat's recent movement.

% Impact (Last 7 Days): This demonstrates a 7-day period change in the frequency of a malware threat infecting PCs. The percentage impact correlates directly to the current Trend Path to determine a rise or decline in the percentage.

Ranking:	2,819
Threat Level:	8/10
Infected PCs:	57,740

First Seen:	August 30, 2016
Last Seen:	October 17, 2023
OS(es) Affected:	Windows

QuasarRAT is a threatening, remote access Trojan whose presence on a computer is a sign that someone is trying to get access to the data stored and the actions performed on the computer. The peculiar thing is that Remote Access Trojans (RATs) are often quite expensive, especially when they contain the list of features that QuasarRAT's author has implemented in their creation. However, the case with QuasarRAT is that this product is entirely free, and its source code can be obtained, modified, and compiled to fit the needs of ill-minded users. Since the product comes in the form of uncompiled files, it is likely that only knowledgeable cyber crooks will be able to fully utilize the features of this threat, therefore reducing the likelihood that complete beginners will be able to infect innocent users with their versions of QuasarRAT.

According to the release page of QuasarRAT, this is supposed to be a Remote Administration Tool, but its description shows that it is likely to be used for harmful purposes. QuasarRAT is able to access and control the victim's desktop, webcam, and microphone, as well to log keystrokes to store conversations, usernames, passwords and other data. Just like the majority of RATs, it provides attackers with remote desktop access, as well as the potential to download/upload and execute files on the victim's computer. The entire list of features is rather long, but it shows that QuasarRAT is a powerful tool that you must be protected from if you want to avoid serious problems.

Since QuasarRAT might be used by anyone, it is impossible to determine the exact infection vectors that random cyber crooks might use. That's why the number one advice is to learn how to browse the Web safely and stay away from websites or content that are deemed unsafe. Remember to double check all downloaded websites with a reliable anti-virus tool to ensure that they will not cause any harm to your PC when you open them. Naturally, you also should install and activate a credible PC security utility that can keep you away from unsafe content that you might encounter during your Web browsing ventures.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:

c:\Users\<username>\appdata\roaming\optigrillss\optigrillst.exe

File name: optigrillst.exe
Size: 190.46 KB (190464 bytes)
MD5: 59122b93dabdb8d0736adcf7f57f71df
Detection count: 70
File type: Executable File
Mime Type: unknown/exe
Path: c:\Users\<username>\appdata\roaming\optigrillss
Group: Malware file
Last Updated: February 25, 2019

file.exe

File name: file.exe
Size: 714.21 KB (714216 bytes)
MD5: 46d08a8be16768ee32fcbaa8083ea2f0
Detection count: 57
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
Last Updated: August 30, 2016

Registry Modifications

The following newly produced Registry Values are:

Regexp file mask %APPDATA%\rocking.exe%APPDATA%\K-Mart Corp\K-Mart Corp.exe%APPDATA%\Microsoft\Windows\Update\Update.exe%APPDATA%\system\core.exe%WINDIR%\System32\Tasks\Quasar Client StartupHKEY..\..\..\..{RegistryKeys}SOFTWARE\Microsoft\Tracing\sschost_RASAPI32SOFTWARE\Microsoft\Tracing\sschost_RASMANCSSOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\Quasar Client StartupSOFTWARE\Wow6432Node\Microsoft\Tracing\sschost_RASAPI32SOFTWARE\Wow6432Node\Microsoft\Tracing\sschost_RASMANCS

Additional Information

The following directories were created:

%APPDATA%\SubDir%APPDATA%\SubDirr%APPDATA%\optigrillss%WINDIR%\SysWOW64\SubDir%WINDIR%\system32\SubDir