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AlienVault® USM Anywhere™

Microsoft Windows IIS NXLog

When you configure Microsoft IIS to send logs through NXLog to USM Anywhere, you can use the Windows IIS NXLog plugin to translate the raw log data into normalized events for analysis.

Device Details
Device vendor Microsoft
Device type Web server
Connection type Syslog
Vendor link Collecting Windows System Logs

Integrating Microsoft IIS and NXLog

Before you configure Microsoft IIS to send logs to USM Anywhere through NXLog, you need to configure logging on IIS first.

Configure Logging in IIS

To configure Logging at the server level

  1. Open IIS Manager.
  2. In the Connections tab, select the server and double-click the Logging icon.
  3. Under One log file per, select Site.
  4. Under Log File, click Select Fields to choose the information you want to log.

    Make sure to match the screenshot below because the plugin will look for these fields.

    Configure Logging at site level in IIS Manager

  5. If using the IIS-NXLOG-Extended configuration provided by AlienVault (See "Configure NXLog" below for more information), you also need to

    • Select Bytes Sent (sc-bytes), Bytes Received (cs-bytes), and Host (cs-host).
    • Add the x-forwarded-for field. Click Add Field and fill in the information as shown.

    add custom field

  6. Click Apply.

Configure NXLog

Before you configure the integration, you must have the IP Address of the USM Anywhere Sensor.

To configure NXLog to send log data to USM Anywhere

In the NXLog configuration file, AlienVault includes two different sections for IIS, IIS-NXLOG and IIS-NXLOG-Extended, with the latter collecting some additional fields from the IIS log. These fields include cs-host, sc-bytes, cs-bytes, and x-forwarder-for. Uncomment the section containing the fields you want to collect.

Important: Do not uncomment both sections because it will generate duplicate events in USM Anywhere.

Plugin Enablement

The Windows IIS NXLog plugin will automatically process all messages when the raw message contains SourceModuleName":"IIS_Logs, SourceModuleName":"IIS_IN, or SourceModuleName":"IIS_Extended_IN.

Available Plugin Fields

The following plugin fields are important attributes extracted from the syslog message. USM Anywhere reports use these fields, and you can also reference them when creating custom reports. In addition to reporting, the USM Anywhere correlation rules make use of these fields.

  • timestamp_occured

  • source_address

  • destination_address

  • destination_port

  • source_username

  • request_user_agent

  • response_code

  • request_referrer

  • request_url

  • request_method

  • duration

  • event_name

Troubleshooting

For troubleshooting, refer to the vendor documentation:

https://www.iis.net/learn/troubleshoot