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Code Mutation (Polymorphism)

Before we start it’s probably best to explain some things: Signature – A pattern of bytes used by an antivirus to identify malicious executables, this could be a string, parts of a function, or a hash. Crypting – This is the most common way of evading antivirus detections, it works …

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Bootkit Disk Forensics – Part 3

Getting Original Pointers XP is a little more complicated than newer systems due to the use of a single driver for both port and miniport; however, getting the original pointers is fairly straight forward depending on how you do it. IRP_MJ_SCSI & DriverStartIo – Method 1 (Windows XP) A common …

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Bootkit Disk Forensics – Part 2

DriverStartIo As I explained in the previous article: DriverStartIo is used by older miniports to actually perform the disk I/O, it takes 2 parameters (a device object and an IRP), exactly the same as IoCallDriver does. The call to DriverStartIo is done with IoStartPacket; however, the device object passed is …