![]() To ensure this kind of event doesn’t happen, minifilters are assigned a specific altitude by Microsoft. AltitudeĪssuming an attempt to read data from a file system, it wouldn’t be much good if an anti-virus minifilter tried to read the contents of an IRP before an encryption minifilter had the opportunity to decrypt it. Altitude is especially important, so let’s start there. We’ll explain instances, altitude, and frames as we go. You should see something similar to this… Start an elevated command prompt and run fltmc.exe *Technically not just IRPs, also Fast I/O and FSFilter operations. ![]() Along the way we’re going to touch on User Account Control (UAC), WIM Boot, SuperFetch, ReadyBoost, and Windows Defender.įile System Minifilter Drivers are drivers that attach to the filter manager in the I/O stack and for the most part either observe or modify I/O Request Packets (IRPs)* that they’re interested in. In this post we’re going to gain an understanding of what File System Minifilter Drivers are and what they do. How does your anti-virus software know you’re trying to open a file that it needs to scan? How does your encryption software transparently encrypt and decrypt your files? How do file quotas get enforced? In each of these cases the answer probably relates to a specific File System Minifilter Driver. ![]()
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