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In April of 2019, the Cybereason Nocturnus team encountered and analyzed a new type of ransomware dubbed REvil/Sodinokibi. REvil/Sodinokibi is highly evasive, and takes many measures to prevent its detection by antivirus and other means.


In this blog post, we perform a deep technical analysis of the Sodinokibi ransomware, focusing on the ransomware delivery method as well as the defensive mechanisms put in place by the malware authors in order to evade AV detection.

The initial infection vector used by the threat actor is a phishing email containing a malicious link. When pressed, the link downloads a supposedly legitimate zip file that is actually malicious. REvil / Sodinokibi zip files have a very low detection rate on VirusTotal, which signals that the majority of antivirus vendors do not flag the initial payload as malicious.

Cybereason discovered a new toolset developed by Iranian APT Phosphorus which revealed a connection to Memento ransomware and includes the newly discovered PowerLess Backdoor that evades detection by running PowerShell in a .NET context...

We observed multiple adversaries this year renaming the Mshta binary to evade brittle detection logic. While we cover this extensively in our analysis of T1036.003: Rename System Utilities, binary metadata like internal process names are an effective data source to determine the true identity of a given process.

Defenders can build detection analytics for inline Mshta script execution around these protocol handlers appearing in the command line. A specific detection example for this would be to look for the execution of mshta.exe in conjunction with a command line containing any of the protocol handlers that are relevant to Mshta: javascript, vbscript, or about, to name a few options. The following offers an example of what that might look like in the wild:

Another example of suspicious process ancestry would be Mshta spawning other scripting engines, like PowerShell, as child processes. As such, looking for mshta.exe launching powershell.exe could serve as a high-fidelity detection analytic for a specific behavior. The following Kovter persistence example does just this, with the HTA code pulled from the registry subsequently spawning an instance of PowerShell:

As is illustrated in the image above (where mshta is masquerading as calc[.]com), adversaries will occasionally rename Mshta to evade short-sighted detection logic. In these cases, defenders can bolster their detection of Mshta abuse by alerting on activity where the internal binary name is consistent with mshta.exe but the apparent filename is not. A renamed instance of Mshta should be highly suspicious and provide a high signal-to-noise analytic.

Also note that the above example includes the javascript protocol handler, meaning that this style of detection will complement and provide added context to the protocol handler detection ideas listed above.

Detection analytics that are based on mshta.exe spawning untrusted or unsigned binaries can be especially prone to high numbers of false positives. This can be alleviated in parts by effectively tuning detection logic to account for related activity that is benign in your environment.

As a result of its popularity compared to Brute Ratel, its detection coverage is greater than that of the latter. This makes Brute Ratel and other less established C&C frameworks an increasingly more attractive option for malicious actors, whose activities may remain undetected for a longer period.

Users can also protect systems through managed detection and response (MDR), which utilizes advanced artificial intelligence to correlate and prioritize threats, determining if they are part of a larger attack. It can detect threats before they are executed, thus preventing further compromise.

Ransomware attacks have gained notoriety in recent years due to their potentially devastating consequences, with costs for ransomware victims amounting to millions of dollars. Work through this example project to see how easy ransomware is to make and understand the inner workings of a ransomware attack.

In addition, real ransomware's source code is often obfuscated by tools specifically designed to make code hard to read -- so even after decompiling, you may not be left with anything useful. Malicious actors will try everything they can to keep their code secret and evade detection as long as possible. They use many other methods to avoid identification, such as using hard-to-follow URLs for any external connections their ransomware might have.

CryptoWall gained notoriety after the downfall of the original CryptoLocker. It first appeared in early 2014 and other variants have appeared including CryptoBit, CryptoDefense, CryptoWall 2.0 and CryptoWall 3.0.

The slave processes will be executed with a different set of parameters as shown below. Each slave process will encrypt only a small number of files, to avoid heuristic detections available in endpoint security products. The list of files to encrypt is taken from the master process via IPC, an interface used to share data between applications in Microsoft Windows. The communication is done through IPC using a mapped section named SM-.

It was a random shot, and yet the reporter's instinct was right.Gatsby's notoriety, spread about by the hundreds who had acceptedhis hospitality and so become authorities on his past, hadincreased all summer until he fell just short of being news.Contemporary legends such as the "underground pipe-line to Canada"attached themselves to him, and there was one persistent story thathe didn't live in a house at all, but in a boat that looked like ahouse and was moved secretly up and down the Long Island shore.Just why these inventions were a source of satisfaction to JamesGatz of North Dakota, isn't easy to say.

Sqlmap is an open source penetration testing tool. It automates the entire process of detecting and exploiting SQL injection flaws. It comes with many detection engines and features for an ideal penetration test.

Snort is an open-source intrusion detection and pen testing system. It offers the benefits of signature-protocol- and anomaly-based inspection methods. This is one of the best tools for pentesting and helps users to get maximum protection from malware attacks.

In this blog, we explain present a technical analysis of the REvil ransomware, focusing on the delivery method and the defense mechanisms employed by the malware authors to evade anti-virus detection.

The initial infection vector used by the threat actor is a phishing email containing a malicious link. When accessed, the link downloads a malicious zip file. REvil/Sodinokibi zip files have a very low detection rate on VirusTotal, suggesting that most antivirus vendors do not flag the initial payload as malicious.

Kevin Poulsen, also known as Dark Dante, became famous for his notoriety when he took over all the telephone lines of Los Angeles radio station KIIS-FM, guaranteeing that he would be the 102nd caller and win the prize of a Porsche 944 S2.

Unium gives a flexible interface that allows to remotely control and inspect a game while it is running. While the API Unium offers some very interesting possibilities to inspect game behavior, object coordinates or latency, it is not a stand-alone solution. Its compatibility with Appium circumvents one of the major problems of Appium, the object detection. The association between Unium and Appium is of great interest in the testing of mobile applications. 041b061a72


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