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Saturday, January 20, 2024

SolarMarker Malware Uses Novel Techniques To Persist On Hacked Systems

 In a sign that threat actors continuously shift tactics and update their defensive measures, the operators of the SolarMarker information stealer and backdoor have been found leveraging stealthy Windows Registry tricks to establish long-term persistence on compromised systems.

Cybersecurity firm Sophos, which spotted the new behavior, said that the remote access implants are still being detected on targeted networks despite the campaign witnessing a decline in November 2021.

Boasting of information harvesting and backdoor capabilities, the .NET-based malware has been linked to at least three different attack waves in 2021. The first set, reported in April, took advantage of search engine poisoning techniques to trick business professionals into visiting sketchy Google sites that installed SolarMarker on the victim's machines.

Then in August, the malware was observed targeting healthcare and education sectors with the goal of gathering credentials and sensitive information. Subsequent infection chains documented by Morphisec in September 2021 highlighted the use of MSI installers to ensure the delivery of the malware.

The SolarMarker modus operandi commences with redirecting victims to decoy sites that drop the MSI installer payloads, which, while executing seemingly legitimate install programs such as Adobe Acrobat Pro DC, Wondershare PDFelement, or Nitro Pro, also launches a PowerShell script to deploy the malware.


"These SEO efforts, which leveraged a combination of Google Groups discussions and deceptive web pages and PDF documents hosted on compromised (usually WordPress) websites, were so effective that the SolarMarker lures were usually at or near the top of search results for phrases the SolarMarker actors targeted," Sophos researchers Gabor Szappanos and Sean Gallagher said in a report shared with The Hacker News.

The PowerShell installer is designed to alter the Windows Registry and drop a .LNK file into Windows' startup directory to establish persistence. This unauthorized change results in the malware getting loaded from an encrypted payload hidden amongst what the researchers called a "smokescreen" of 100 to 300 junk files created specifically for this purpose.

"Normally, one would expect this linked file to be an executable or script file," the researchers detailed. "But for these SolarMarker campaigns the linked file is one of the random junk files, and cannot be executed itself."

What's more, the unique and random file extension used for the linked junk file is utilized to create a custom file type key, which is ultimately employed to execute the malware during system startup by running a PowerShell command from the Registry.

The backdoor, for its part, is ever-evolving, featuring an array of functionalities that allow it to steal information from web browsers, facilitate cryptocurrency theft, and execute arbitrary commands and binaries, the results of which are exfiltrated back to a remote server.

"Another important takeaway […], which was also seen in the ProxyLogon vulnerabilities targeting Exchange servers, is that defenders should always check whether attackers have left something behind in the network that they can return to later," Gallagher said. "For ProxyLogon this was web shells, for SolarMarker this is a stealthy and persistent backdoor that according to Sophos telematics is still active months after the campaign ended."

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BurpSuite Introduction & Installation



What is BurpSuite?
Burp Suite is a Java based Web Penetration Testing framework. It has become an industry standard suite of tools used by information security professionals. Burp Suite helps you identify vulnerabilities and verify attack vectors that are affecting web applications. Because of its popularity and breadth as well as depth of features, we have created this useful page as a collection of Burp Suite knowledge and information.

In its simplest form, Burp Suite can be classified as an Interception Proxy. While browsing their target application, a penetration tester can configure their internet browser to route traffic through the Burp Suite proxy server. Burp Suite then acts as a (sort of) Man In The Middle by capturing and analyzing each request to and from the target web application so that they can be analyzed.











Everyone has their favorite security tools, but when it comes to mobile and web applications I've always found myself looking BurpSuite . It always seems to have everything I need and for folks just getting started with web application testing it can be a challenge putting all of the pieces together. I'm just going to go through the installation to paint a good picture of how to get it up quickly.

BurpSuite is freely available with everything you need to get started and when you're ready to cut the leash, the professional version has some handy tools that can make the whole process a little bit easier. I'll also go through how to install FoxyProxy which makes it much easier to change your proxy setup, but we'll get into that a little later.

Requirements and assumptions:

Mozilla Firefox 3.1 or Later Knowledge of Firefox Add-ons and installation The Java Runtime Environment installed

Download BurpSuite from http://portswigger.net/burp/download.htmland make a note of where you save it.

on for Firefox from   https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/


If this is your first time running the JAR file, it may take a minute or two to load, so be patient and wait.


Video for setup and installation.




You need to install compatible version of java , So that you can run BurpSuite.

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