Inside the quarantine folder the malware files are stored with a “.bup” extension and while this initially looks complicated the files are simply compound files that can be opened with 7zip or any of the forensic tools of your choice. McAfee stores its quarantined files in a “Quarantine” directory located off the root of the C: drive. The purpose here is not to promote a tool but to demonstrate how the process works so you have the knowledge and understanding of what is happening to the data at the disk level and repeat it one whatever AV vendor has quarantined your files. We will be using the WinHex hex editing tool from X-Ways forensics to complete this process, however, there are a few other free tools that can be used to achieve the same goal. This paper will show you how to extract and de-obfuscate the quarantined files from McAfee AV and Avira anti-virus applications. None of which are the subject of this paper. There are many reasons locating the original malware executable is critical to an investigation, such as reverse engineering the code, hash analysis, text string analysis, etc. In order for us to reverse this process manually we must know the one byte XOR key, which is difficult to decipher from the data in the “Details” file. This process can be reversed from within the application but the user never sees what is going on behind the scenes. When McAfee or other anti-virus programs quarantines a malicious file they uses an XOR process with a one-byte key to obfuscate the data. However, sometimes we can get lucky and one or more workstations will have an updated anti-virus application that quarantined the malicious files for us. To make matters worse, the deleted malware is often overwritten by the time the IR team gets on site, which can make it difficult to collect and reverse engineer the code to identify Indicators of Compromise (IOCs). You need a few options as it saves the quality, and you need no experience to cut and rejoin a video in munites.During an incident response engagement, it is common to find the original malware that wreaked havoc in the network was deleted as part of the anti-forensics built into the code or by an over eager first responder. It's a lean, mean splitting and joining machine. MP4Tools isn't a full-blown professional package. Now, to join the videos, you just split back into one video, open MP4 Joiner, add the videos you want to join, and press the join button. With MP4 Splitter, add the video you want to split, use the slider to add your split points, then select start splitting. If you can use one, you can use the other one.īoth have an options icon that looks like a wrench that gives you access to a few things, but primarily to force reencoding and a few settings to go with it. While they are different in size, they are similar in appearance. MP4Splitter allows you to split an MP4 file into multiple files without reencoding and without quality loss.Īs the description states, it comes with the two applications you can launch individually or one at a time. MP4Joiner allows you to join multiple MP4 files into one without reencoding and without quality loss. MP4Tools comes with two programs, MP4Joiner and MP4Splitter, to split and join MP4 files.
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