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QUERY OSQUERY ON ANOTHER MACHINE HOW TO
In the previous blog post, we saw how to analyze a malware infection, stage by stage. This is a common persistence mechanism that malware droppers use in order to stay in the system.īy using Osquery we can detect a lot of mechanisms and techniques frequently used by malware threats.
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The malware will be executed every time the user logs on. Opening the sample with a .NET debugger, we can see that it first creates a new file in the user temp directory and writes a new value in the “CurrentVersion\Run” registry key for the user space pointing to that file. This malware encrypts users’ personal documents and requests an amount of Bitcoins to get all files restored back. In this case, we will analyze a piece of malware built using the .NET framework, in particular a sample of Shrug ransomware. To do so, we will continue using Osquery to explore the registry and startup_items tables. In this post, we are going to see another common technique that malware uses, persistence. Using Osquery, we were able to discover how it infects a system using a malicious Microsoft Office document and how it extracts and executes the payload. In that post, we followed the activity of the known Emotet loader, popular for distributing banking trojans. In the first part of this series, we saw how you can use Osquery to analyze and extract valuable information about malware’s behavior.