You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fileless_execution.go
    path of file: ./repos/tracee/signatures/golang
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"

	"github.com/aquasecurity/tracee/signatures/helpers"
	"github.com/aquasecurity/tracee/types/detect"
	"github.com/aquasecurity/tracee/types/protocol"
	"github.com/aquasecurity/tracee/types/trace"
)

type FilelessExecution struct {
	cb detect.SignatureHandler
}

func (sig *FilelessExecution) Init(ctx detect.SignatureContext) error {
	sig.cb = ctx.Callback
	return nil
}

func (sig *FilelessExecution) Get
    
func (sig *FilelessExecution) GetMetadata() (detect.SignatureMetadata, error) {
	return detect.SignatureMetadata{
		ID:          "TRC-105",
		Version:     "1",
		Name:        "Fileless execution detected",
		EventName:   "fileless_execution",
		Description: "Fileless execution was detected. Executing a process from memory instead from a file in the filesystem may indicate that an adversary is trying to avoid execution detection.",
		Properties: map[string]interface{}{
			"Severity":             3,
			"Category":             "defense-evasion",
			"Technique":            "Reflective Code Loading",
			"Kubernetes_Technique": "",
			"id":                   "attack-pattern--4933e63b-9b77-476e-ab29-761bc5b7d15a",
			"external_id":          "T1620",
		},
	}, nil
}