Introduction to Log Collector and Event Sources | SIEM

In this article we will discuss how we use log collector to collect and analyses logs. While in previous article we have discussed about Logs. We already have discussed following topics:

  • What’s in the logs?
  • How to find logs in window device.
  • Overview of tools uses by Security experts for log analysis and their work flow.
  • SIEM : Security Incident And Event Management

Note: We are using RSA Security Analytics

Introduction to Log collector

To analyze and investigate logs we first need to integrate event sources. Here integration of Event Sources simply means that we need a source to send logs while on other hand we need a destination to collect logs. So, the log collector service analyzes and collect logs from event sources throughout the IT environment of an organization. After that logs are parsed on the bases of their corresponding parsers and break into bunch of Meta data for the use in investigation and reports.

What are Event sources?

Introduction to Log Collector and Event Sources | SIEM

Event sources are the assets of organization on the network such as servers, switches, routers, firewalls, window machine etc. In most of the cases, IT team of organization configure event sources to send its logs and Security Analyst administrator configure log collector to receive the same.
Log collector receives in original form without using any filter or normalization. As aggregation and normalization of meta data takes place at concentrator.
Log collector service in Security Analytics supports following type of event sources.

  • Check points
  • File
  • ODBC
  • SDEE
  • SNMP
  • SysLog
  • VMWare
  • Windows
  • Windows Legacy

Local Collector And Remote collector

Local collector is a log collector service running on Log Decoder appliance with log decoder service. Log collector service is simply to perform log collection from various protocols like Windows, ODBC etc, and events are forwarded to log decoder service to parse those events.

You require at least one local collector to collect events.

Virtual Log Collector (VLC ) or Remote Log Collector

Remote log collector is a log collector service running on virtual machine. Remote log collector is optional and they must have to send the events to local collector. Deployment of virtual log collector is ideal when you have to collect logs from remote sites. You just deploy an .ovf file of vlc and integrate event sources on vlc. VLC will send all events to local log collector and then log collector service forwarded these events to log decoder service.

There are two methods to send logs to local collector:

  1. Pull configuration: You need to configure local collector for this method. From local collector select remote collectors from which you want to pull logs.
  2. Push configuration: In this case from remote log collector select local collector to send logs.

You can deploy one or more than one remote collector to push events to local collector. It is based on client requirements. If client wants to collect logs from different remote location then you have to deploy vlc on each location. All these vlcs will push logs to same local collector.

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