What are pipes?
Pipes are used to help facilitate communication between two applications and or processes using shared memory. Microsoft Windows Pipes utilizes a client-server implementation whereby the process that creates a named pipe is known as the server and the process that communicates with the named pipe is known as the client.
PipeEventCreate
This event is logged when a named pipe is created. Malware often uses named pipes for inter-process communication.
Reference: https://docs.microsoft.com/en-us/sysinternals/downloads/sysmon#event-id-17-pipeevent-pipe-created
PipeEventConnected
This event is logged when a named pipe connection is made between a client and a server.
Reference: https://docs.microsoft.com/en-us/sysinternals/downloads/sysmon#event-id-18-pipeevent-pipe-connected
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*No entries were found in PipeCreated & PipeConnected. This doesn't seem to be a common method used by processes.