#etw #tracing #windows #microsoft


Basically a rip off KrabsETW written in Rust

1 unstable release

0.1.1 Apr 26, 2021
0.1.0 Apr 26, 2021

#7 in #microsoft

Download history 17/week @ 2022-08-14 18/week @ 2022-08-21 28/week @ 2022-08-28 21/week @ 2022-09-04 25/week @ 2022-09-11 25/week @ 2022-09-18 11/week @ 2022-09-25 23/week @ 2022-10-02 15/week @ 2022-10-09 15/week @ 2022-10-16 17/week @ 2022-10-23 24/week @ 2022-10-30 19/week @ 2022-11-06 13/week @ 2022-11-13 25/week @ 2022-11-20 12/week @ 2022-11-27

72 downloads per month
Used in 2 crates (via precord-core)



FerrisETW 🦀

Basically a rip off KrabsETW written in Rust, hence the name Ferris 🦀

All credits go to the team at Microsoft who develop KrabsEtw, without it, this project probably wouldn't be a thing.


Since lately I've been working very closely with ETW and Rust, I thought that having a tool that would simplify ETW management written in Rust and available as a crate for other to consume would be pretty neat and that's where this crate comes into play 🔥


You can find a few examples within the [Examples] folder. If you are familiar with KrabsETW you'll see that is very similar In case you've never used KrabsETW before, the examples are very straight forward and should be easy to follow. If you have any issues don't hesitate in asking.

The following snippet shows the basic usage of the library

fn wmi_callback(record: EventRecord, schema_locator: &mut SchemaLocator) {
    // We locate the Schema for the Event
    match schema_locator.event_schema(record) {
        Ok(schema) => {
            // We filter the event by EventId
            if schema.event_id() == 12 {
                // We obtain the Parser for the Schema
                let mut parser = Parser::create(&schema);
                // We parse the data from the Event based on the names of the fields of the Event
                // Type annotations or Fully Qualified Syntax are needed when calling TryParse
                let op: String = parser
                    .unwrap_or(String::from("Operation missing"));
                let provider_name: String = parser
                    .unwrap_or(String::from("ProviderName missing"));
                // Could also use String as type
                let provider_guid: Guid =
                    "WMI-Activity -> ProviderName {}, ProviderGuid: {:?}, Operation: {}",
                    provider_name, provider_guid, op
        Err(err) => println!("Error {:?}", err),

fn main() {
    // We first build a Provider
    let wmi_provider = Provider::new()
        .by_guid("1418ef04-b0b4-4623-bf7e-d74ab47bbdaa") // Microsoft-Windows-WMI-Activity
    // We enable the Provider in a new Trace and start the trace
    // This internally will launch a new thread
    let mut trace = UserTrace::new().enable(wmi_provider).start().unwrap();

    std::thread::sleep(Duration::new(20, 0));
    // We stop the trace


  • The project is still WIP, there's still plenty of things to evaluate/investigate and things to fix and do better. Any help would be greatly appreciated, also any issues you may have!

  • The types available for parsing are those that implement the trait TryParse for Parser, basic types are already implemented. In the near future I'll add more :)

  • I tried to keep dependencies as minimal as possible, also you'll see I went with the new windows-rs instead of using the winapi. This is a personal decision mainly because I believe the Windows bindings is going to be the "standard" to interact with the Windows API in the near future.

  • Although I encourage everyone to use Rust, I do believe that, at the moment, if you plan on interacting with ETW in a production level and the programming language is not a constraint you should definitely go with KrabsETW as a more robust and tested option. Hopefully in next iterations I'll be able to remove this disclaimer 😃


  • First of all, the team at MS who develop KrabsETW!!
  • Shaddy for, pretty much, teaching me all the Rust I know 😃


~3M SLoC