Filebeat IIS module - add network.forwarded.ip to related.ip

[leweafan]

Describe the enhancement:

Add network.forwarded.ip to related.ip for filebeat module fortinet (event.dataset=iis.access):

According to ECS field description:

All of the IPs seen on your event.

Describe a specific use case for the enhancement or feature:

Missing ip in related.ip affects security issues discovery cause you can't be sure that all event' ip indeed present in related.ip.

In an example below network.forwarded.ip 172.20.97.46 not added to related.ip.

POST /_ingest/pipeline/filebeat-8.6.1-iis-access-pipeline/_simulate
{
  "docs": [
    {
      "_source": {
        "@timestamp": "2023-02-22T12:51:14.333",
        "message" : "2023-02-22 12:51:14 172.20.98.21 POST /mapi/emsmdb/ MailboxId=xxx@test.com 444 Anonymous 172.20.98.22 Microsoft+Office/16.0+(Windows+NT+10.0;+Microsoft+Outlook+16.0.10395;+Pro) - 200 0 64 92255 172.20.102.177,172.20.97.46"
      }
    }
  ]
}

{
  "docs": [
    {
      "doc": {
        "_index": "_index",
        "_id": "_id",
        "_version": "-3",
        "_source": {
          "temp": {},
          "destination": {
            "address": "172.20.98.21",
            "port": 444,
            "ip": "172.20.98.21"
          },
          "source": {
            "address": "172.20.98.22",
            "ip": "172.20.98.22"
          },
          "url": {
            "path": "/mapi/emsmdb/",
            "original": "/mapi/emsmdb/",
            "query": "MailboxId=xxx@test.com"
          },
          "network": {
            "forwarded_ip": "172.20.102.177"
          },
          "tags": [
            "_geoip_database_unavailable_GeoLite2-City.mmdb",
            "_geoip_database_unavailable_GeoLite2-ASN.mmdb"
          ],
          "iis": {
            "access": {
              "sub_status": 0,
              "win32_status": 64
            }
          },
          "@timestamp": "2023-02-22T12:51:14.000Z",
          "related": {
            "ip": [
              "172.20.98.22",
              "172.20.98.21"
            ],
            "user": [
              "Anonymous"
            ]
          },
          "http": {
            "request": {
              "method": "POST"
            },
            "response": {
              "status_code": 200
            }
          },
          "event": {
            "duration": 92255000000,
            "ingested": "2023-02-22T13:54:15.620326130Z",
            "original": "2023-02-22 12:51:14 172.20.98.21 POST /mapi/emsmdb/ MailboxId=xxx@test.com 444 Anonymous 172.20.98.22 Microsoft+Office/16.0+(Windows+NT+10.0;+Microsoft+Outlook+16.0.10395;+Pro) - 200 0 64 92255 172.20.102.177,172.20.97.46",
            "created": "2023-02-22T12:51:14.333",
            "kind": "event",
            "category": [
              "web",
              "network"
            ],
            "type": [
              "connection"
            ],
            "outcome": "success"
          },
          "user": {
            "name": "Anonymous"
          },
          "user_agent": {
            "original": "Microsoft Office/16.0 (Windows NT 10.0; Microsoft Outlook 16.0.10395; Pro)",
            "os": {
              "name": "Windows",
              "version": "10",
              "full": "Windows 10"
            },
            "name": "Outlook",
            "device": {
              "name": "Other"
            },
            "version": "2016"
          }
        },
        "_ingest": {
          "timestamp": "2023-02-22T13:54:15.62032613Z"
        }
      }
    }
  ]
}

[botelastic[bot]]

This issue doesn't have a Team:<team> label.

[botelastic[bot]]

Hi! We just realized that we haven't looked into this issue in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!