Update your custom detections to leverage new ActionTypes in DeviceNetworkEvents

Originally posted by Microsoft May 23, 2023 Uncategorized 0 Comments

On July 18, 2023, Microsoft will be retiring a subset of signatures found in the “NetworkSignaturesInspected” action type of Advanced Hunting. With the recent integration of Zeek providing advanced protocol parsing capabilities, which result in better visibility into full network sessions compared to the raw packet bytes found in the “NetworkSignaturesInspected” action type of Advanced Hunting today, the effort to consolidate will provide a better overall experience for our customers by reducing the signatures that serve similar functions without the added benefits provided by the new Zeek alternative.

When this will happen:

July 18, 2023

How this affects your organization:

For customers currently using the “NetworkSignaturesInspected” action type, here is a list of signatures that will be deprecated, referenced alongside their alternatives available in Advanced Hunting: 

Protocol / Signature Name	Old Action Type	New Action Type
SSH	NetworkSignatureInspected	SshConnectionInspected
FTP_Upload	NetworkSignatureInspected	FtpConnectionInspected
FFP_Client	NetworkSignatureInspected	FtpConnectionInspected
HTTP_Client	NetworkSignatureInspected	HttpConnectionInspected
HTTP_Server	NetworkSignatureInspected	HttpConnectionInspected
HTTP_RequestBodyParameters	NetworkSignatureInspected	HttpConnectionInspected
HTTPS_Client	NetworkSignatureInspected	SslConnectionInspected
DNS_Request	NetworkSignatureInspected	DnsConnectionInspected

What you can do to prepare:

An example of your old query:

DeviceNetworkEvents  

| where ActionType == “NetworkSignatureInspected”

| extend AdditionalFields = todynamic(AdditionalFields)

| where AdditionalFields.SignatureName == “SSH”

Your new query:

DeviceNetworkEvents  

Your organization might be using a “NetworkSignatureInspected” action type in your Advanced Hunting queries and custom detections. Particularly, you might be using a Signature Name that is going to be deprecated soon. Please update your queries with the new action types so that you can leverage this valuable data and avoid breaking your current custom detections.

| where ActionType == “SshConnectionInspected”

Message ID: MC559251