mirror of
https://github.com/microsoft/krabsetw
synced 2026-06-06 16:14:32 +00:00
Matt Swann
ab944eeef1
* Add support in C++/CLI for native ETW filtering * Update nuspec * Fix constructor comments * Define a marshal_as template for List<T> to vector<T> * Revert back to a helper method * Add a generic list -> vector converter Extract to a separate file * CR feedback
54 lines
2.5 KiB
C#
54 lines
2.5 KiB
C#
// Copyright (c) Microsoft. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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// This example shows how to use a user_trace to extract powershell command
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// invocations. It combines predicate-based and ETW-native filtering.
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using System;
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using Microsoft.O365.Security.ETW;
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namespace ManagedExamples
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{
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public static class UserTrace004
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{
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public static void Start()
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{
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// UserTrace instances should be used for any non-kernel traces that are defined
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// by components or programs in Windows. They can optionally take a name -- if none
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// is provided, a random GUID is assigned as the name.
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var trace = new UserTrace();
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// A trace can have any number of providers, which are identified by GUID. These
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// GUIDs are defined by the components that emit events, and their GUIDs can
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// usually be found with various ETW tools (like wevutil).
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var powershellProvider = new Provider(Guid.Parse("{A0C1853B-5C40-4B15-8766-3CF1C58F985A}"));
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// UserTrace providers typically have any and all flags, whose meanings are
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// unique to the specific providers that are being invoked. To understand these
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// flags, you'll need to look to the ETW event producer.
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powershellProvider.Any = Provider.AllBitsSet;
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// In UserTrace003.cs, we use ETW-based filtering to select a specific event ID.
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//
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// We can combine ETW-based filtering with predicate filters to filter on specific
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// event properties without impacting performance.
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var filter = new EventFilter(7937, UnicodeString.Contains("ContextInfo", "Write-Host"));
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// EventFilters have attached callbacks, just like a regular provider.
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filter.OnEvent += (record) =>
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{
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System.Diagnostics.Debug.Assert(record.Id == 7937);
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Console.WriteLine(record.GetUnicodeString("ContextInfo"));
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};
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// EventFilters are attached to providers. Events that are attached to the filter
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// will only be called when the filter allows the event through. Any events attached
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// to the provider directly will be called for all events that are fired by the ETW
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// producer.
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powershellProvider.AddFilter(filter);
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trace.Enable(powershellProvider);
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trace.Start();
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}
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}
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}
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