Intrusion Detection

Configuring and auditing Linux systems with Audit daemon

Guide for auditing Linux systems by using the audit daemon and related utilities. This powerful audit framework has many possibilities for auditing Linux.

Summary of Configuring and auditing Linux systems with Audit daemon

The Linux Audit Daemon is a framework to allow auditing events on a Linux system. Within this article we will have a look at installation, configuration and using the framework to perform Linux system and security auditing. Auditing goals By using a powerful audit framework, the system can track many event types to monitor and audit the system. Examples include: Audit file access and modification See who changed a particular file Detect unauthorized changes Monitoring of system calls and functions Detect anomalies like crashing processes Set tripwires for intrusion detection purposes Record commands used by individual users Components The framework itself has several components:

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Detecting Linux rootkits

In this post about intrusion detection we have a look at Linux rootkits, what they do and how to detect them. Linux rootkits are malicious pieces and should be detected as soon as possible.

Summary of Detecting Linux rootkits

Malware, or malicious software is also an issue on Linux systems. Let’s have a look into this threat and what actions you can take. What is a rootkit? A rootkit is a set of tools with the goal to hide its presence and to continue providing system access to an attacker. The word rootkit comes from the root user, which is the administrator account on Linux systems and Unix-clones. The kit refers to a toolkit, or a set of tools.

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How to deal with a compromised Linux system

Is your Linux system compromised or does it run suspicious processes? Learn how to investigate the system and create an action plan.

Summary of How to deal with a compromised Linux system

One day your web hoster or yourself may discover that your Linux system is slow. Upon logging in, you see a high load consumed by a suspicious process name or maybe just the Apache web server. Is your system compromised? How do you know it is? Let’s have a look at how to deal with security breaches and incident response. Recognizing a security breach Not all security breaches are directly visible.

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How to see the file type?

Learn how to determine the details of most types of files on Linux, together with the understanding how these tools do their job.

Summary of How to see the file type?

Did you come across a file, but don’t know what type it is? Let’s learn how to analyze it. The unknown file You may encounter a file on your system with known contents or goal. Usually, the first thing we do is then use cat to show the contents, or execute it. While that makes sense, it may be dangerous to do. It might be a piece of malware, disrupt your screen output or even hang the terminal.

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