SilkETW – New Free Threat Intelligence Tool to Capture and Analyze Windows Events Logs

SilkETW is a flexible tool aimed to reduce the complexities of ETW(Event Tracing for Windows) and to put actionable data in the hands of researches on both the defensive and offensive side.

ETW is a kernel-level tracing facility that allows tracing the kernel logs or application-defined events logs. SilkETW makes the job straightforward by providing an interface for data collection, various filtering mechanics, and an output format that can be easily processed.

“SilkETW is not solely a defensive tool. ETW data can be used for diagnostics, it can help in reverse engineering, vulnerability research, detection, and evasion.”

SilkETW developed by FireEye, it provides a simple interface to record trace data and the output can be extracted is JSON format.

The extracted data can be imported to PowerShell locally or to 3rd party infrastructure such as Elasticsearch for event filtering.

The tool is developed.Net v4.5, a number of 3rd party libraries and Yara functionality to filter or tag event data.

By having the data in hand it is easy to filter the exact event that you want to trace, here researchers demonstrated by identifying a Mimikatz execution.

Also, the SilkETW includes a number of command line flags that allow the user to restrict the events that are captured.

It includes the following capabilities such as event name, the process ID, the process name, and the opcode.

The data collection can be triggered by using the command .NET ETW data and the “-yo” option here indicates that it will write only the Yara matches to file.

SilkETW.exe -t user -pn Microsoft-Windows-DotNETRuntime -uk 0x2038 -l verbose -y
C:\Users\b33f\Desktop\yara -yo matches -ot file -p C:\Users\b33f\Desktop\yara.json

SilkETW is currently research focused data-collection tool with robust yet rudimentary capabilities. the tool can be downloaded on GitHub.

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