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Quasar is a publically available, open-source RAT for Microsoft Windows operating systems (OSs) written in the C# programming language. Please turn JavaScript back on and reload this page.Jive Software Version: 2018.25.0.0_jx, revision: 20200515130928.787d0e3.release_2018.25.0-jxRSA® Identity Governance & Lifecycle Internal CommunityQuasarRAT does not have an option for insecure communication and all traffic will be over SSL, it also uses a custom TCP protocol for its communication so if intercepted the protocol would be tagged as meta value, this is generated as the default port for QuasarRAT is 4782 (this is easily changed however and would more commonly be over 443 to bypass firewall restrictions). This is because QuasarRAT will copy itself to thewe also see this persistence mechanism described there as well with the following meta values:As stated in the network detection section, the RAT will make an HTTP connection toto get the public IP of the victim, we can also see that in the network endpoint data as shown below:rovides database utilities for the Extensible Storage Engine but can also be used to copy locked files for example. The out-of-the-box server could not communicate with the client sample owing to the previously … Older samples do not contain this second stage library, and the .NET loading functionality is implemented directly in the initial loader:Once executed, the "FuckYouAnti" function will decrypt the .NET loader binary using the same XOR based algorithm with a different pair of hardcoded keys.To load the assembly directly into memory, the malware makes use of a technique called "CppHostCLR" which is described in detail in Microsoft DevCentre. After decryption, we discovered that the payloads are backdoors based on The initial loader binary is a 64-bit PE DLL, intended to run as a service. View Full Project. This technique is based on code snippets from Microsoft DevCentre examples. PlugX RAT: The tale of the RAT that has been used in various cyber-espionage campaigns PlugX RAT has been used in several attacks launched by Chinese cyber-espionage group APT10. Drilling into this command, we can see it was used to copy the SAM hive (which is a locked file) to the switch in the command below) to make a backup of the locked file which we are then able to copy:

In newer versions this functionality was shifted to a standalone module.The malware starts by deobfuscating an embedded next-stage executable. The encrypted module is stored in the %WINDOWS%\Microsoft.NET directory. It’s possible that this approach was implemented to thwart XOR bruteforcing attempts:Starting with variant 3, the .NET injection mechanism is implemented inside a second stage DLL, which according to debugging strings seems to be part of a project called “AntiLib”:This DLL is reflectively loaded into memory by an obfuscated shellcode-like routine and invoked by executing an export bearing the unambiguous name: “FuckYouAnti”. During the latter half of 2018, BlackBerry Cylance threat researchers tracked a campaign targeting companies from several verticals across the EMEA region. Its code, together with documentation, can be found on GitHub.The .NET payload is a heavily obfuscated backdoor based on an open-source remote administration tool called The threat actor modified the original backdoor, adding their own field in the configuration, and code for checking the Internet connectivity.

During our investigation we encountered several variants of the loader which indicated a development path lasting over a year; we were also able to locate some (but not all) of the encrypted payload files belonging to these loader variants.

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