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Orcus RAT Author John Paul Revesz, 36, Initially maintain the Orcus RAT as a legitimate tool for an administrator to remotely connect their network systems.

This blog is not intended to discuss reverse-engineering the RAT in detail; however, it is interesting to see some of the anti-analysis features which Orcus employs to avoid being detected in a standard analysis environment.We reverse-engineered one of the Orcus samples seen on a recent attack to check and verify some of the configured features.

Orcus is a legitimate Remote Administration Tool that is merely being abused, but security experts say it includes multiple features more typically seen in malware known as a Remote Access Trojan. (This also suggests that the real name of the Orcus developer may be ‘Vincent’. The long list of the commands is documented on their website. Unit 42 has been tracking a new Remote Access Trojan (RAT) being sold for $40 USD since April 2016, known as “Orcus”. Given the feature rich toolset and the scalability Orcus provides, it is not a surprise that the usage and acceptance of the Orcus RAT is growing among cyber criminals since being first sold early this year.

Although the real perpetrators were manacled, the threat still persists.When we look back two months from now, from May 2020, we can see similar types of Excel macro document lures of the Orcus RAT being distributed in India, Canada, IL, and the US and continues as of this writing. The virtual machines that Orcus detects are ParallelsDesktop, VirtualBox, VirtualPC and VMWare. Free, Open-Source Remote Administration Tool for Windows. )The developer had shared intentions to publish the RAT for free and make it open-source. Though Orcus has all the typical features of RAT malware, it allows users to build custom plugins and also has a modular architecture for better management and scalability.

]fr/gtrdek/1.png” to download yet another payload and renames to “jieifhzo11.exe”.

The infamous “Orcus” Rat, which seems to have popped out Back in 2016, did not vanish entirely.

The malware immediately creates a registry addition with a path to VBS file in a specified location, as a persistence mechanism.As shown in Figure 7, When we navigate to this location which is mentioned in the “Run” registry value, we will identify two files, one the VBS script specified in the Registry and the second one is the same executable renamed.The VBS script will be invoked on every system restarts and executes the malware executable as shown in below Figure 8.Once the executable is triggered, it would then call its C2 server “ntro.fr” at 108.177.235.161 and as we can see the below communications stream in Figure 9, between the victim machine and the C2, it is evident that we are dealing with the infamous “As shown in Figure 10, The Orcus RAT comes with these plugins and each plugin has the info about itThe Github account as we can see in the above Figure 11 and Figure 12, seemingly was tied with the Orcus RAT “Sorzus” — Figure 13. still lies there and also the “Orcus Technologies”As per Krebsonsecurity Blog, “According to Revesz himself, the arrests and searches related to Orcus have since expanded to individuals in the United States and Germany.”The Github account “Sorzus” could be the German Individual as mentioned above.The above analysis was just a quick overview of one of the RATs in the wild.
The Powershell script ensures that it will execute the payload itself.As shown in Figure 6, The executable was found to be a .NET sample and calls windows native helper executables to pave way for its execution.
Figure 6 shows an example of the methods or functions which are available to the Orcus plugin’s ‘ClientController’ class.The Real Time scripting feature allows Orcus users to write and execute code (C#, VB.Net) in real time while remotely managing the compromised system.From an incident responder or threat analyst’s perspective, it is important to understand the type of anti-analysis protections a malware family employs so one is able to build an environment to successfully analyze the malware.

One forum user, alias “Armada”, offered to assist “Sorzus” on helping out with publishing the tool and apparently became Sorzus’ eventual partner.“Sorzus” and “Armada” are believed to be the two main individuals currently managing the sales and development of Orcus. It’s not uncommon but this is an interesting case where a developer with an initial intention to release the code for free or open source, ends up in collaborating with an individual in a hacker forum who has prior experience in building and selling similar malicious tools, and creates a commercial RAT which has started to gain wide acceptance among cyber criminals with its unique feature set and flexible architecture.Palo Alto Networks WildFire correctly identifies Orcus as malicious and AutoFocus customers can track this threat using the The current list of hashes for Orcus samples can be found on the Unit 42 github page Sign up to receive the latest news, cyber threat intelligence and research from us© 2020 Palo Alto Networks, Inc. All rights reserved. The objective of this blog is to highlight some of the capabilities of this new RAT family and the impact seen so far.Before we discuss the details of this RAT family, let’s discuss how Orcus became a commercially sold RAT. However, looking at the feature capabilities, architecture of the tool, and the publishing and selling of the tool in hacker forums, it is clear that Orcus is a malicious tool, and that its target customer is cyber criminals. If an Orcus user enables the VMDetection feature while building the malware binary, the malware would check if the malware is running within a virtual machine environment. Quasar is a fast and light-weight remote administration tool coded in C#. The “Groupname” field holds the entire malicious command and it will be invoked by the embedded Macro as you can see in the figureAs per MITRE framework, the command execution falls under ID: The decoded payload still contained the character encodings, charW, and below figure 4 shows the cleaned output. The usage ranges from user support through day-to-day administrative work to employee monitoring. Orcus RAT has been used in a number of different attacks over the past few years. Lately, we can see an uptick in the Ransomware and Spyware campaigns spreading across the internet.

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