adding event on triggering rule

Signed-off-by: h4l0gen <ks3913688@gmail.com>

events/syscall/decoding_payload_in_container.go

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+Copyright (C) 2024 The Falco Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package syscall
+
+import (
+	"fmt"
+	"os/exec"
+
+	"github.com/falcosecurity/event-generator/events"
+)
+
+var (
+	encodedPayload = "RmFsY28gaXMgbG92ZSEh"
+)
+
+var _ = events.Register(DecodingPayloadInContainer)
+
+func DecodingPayloadInContainer(h events.Helper) error {
+	if h.InContainer() {
+		cmd := exec.Command("sh", "-c", fmt.Sprintf("echo %s | base64 -d", encodedPayload))
+
+		if _, err := cmd.CombinedOutput(); err != nil {
+			return err
+		}
+	}
+	return nil
+}