Sure, however, please note that mitigating insider threats is more related to the field of IT security and less to web development and programming. Nevertheless, I will provide a tutorial based on your request:

1. Introduction

1.1 Brief explanation of the tutorial's goal

This tutorial aims to provide a detailed understanding of insider threats and effective measures to mitigate them in an organization. We'll explore various strategies to prevent, detect, and respond to these threats.

1.2 What the user will learn

By the end of this tutorial, the user will learn about:

• The concept of insider threats
• The potential impact of insider threats
• Preventive measures to mitigate insider threats
• Detection and response strategies

1.3 Prerequisites

Basic understanding of IT security principles and organizational processes is beneficial.

2. Step-by-Step Guide

2.1 Understanding Insider Threats

Insider threats refer to security risks that originate from within the organization. This could be anyone with insider information, such as employees, former employees, contractors, or associates.

2.2 Impact of Insider Threats

The damage from insider threats can be immense, ranging from intellectual property theft, financial fraud, to reputational harm.

2.3 Preventive Measures

• Implement strict access control: Limit access to sensitive information to only those who need it.
• Regular training and awareness programs: Keep your staff educated about the potential threats and how to avoid them.

2.4 Detection Measures

• Install security systems: Use data loss prevention (DLP) software and intrusion detection systems (IDS).
• Regular audits: Conduct regular audits to check for any abnormal activities.

2.5 Response Measures

Have a clear incident response plan in place. This should include investigating the incident, containing the damage, and reporting the event to the necessary parties.

3. Code Examples

3.1 Example: Implementing Access Control

Implementing access control can be done programmatically. Here's a simple Python example:

# Define a function to check access level
def check_access(user_role):
    # Define roles with access
    access_roles = ['admin', 'manager']
    # Check if the user role is in access roles
    if user_role in access_roles:
        return "Access granted"
    else:
        return "Access denied"

In the above example, we define a function that checks if a user's role is among those with access ('admin', 'manager'). If it is, it returns "Access granted", otherwise "Access denied".

4. Summary

In this tutorial, we've learned about insider threats, their potential impact, and how to mitigate them. We've discussed preventive, detection, and response strategies to handle such threats.

5. Practice Exercises

5.1 Exercise 1:

Identify potential insider threats in a given scenario and suggest preventive measures.

5.2 Exercise 2:

Design a basic audit mechanism for a hypothetical organization to detect insider threats.

Please note these exercises are conceptual and do not involve coding.

Remember, the best defense against insider threats is a combination of technical measures, organizational processes, and staff awareness. Continue learning about IT security principles and stay updated with the latest practices.