Introduction to Cyber Crime: The Digital Threat Landscape

Table of Contents

• 1.1 What is Cyber Crime?
• 1.2 Categories of Cyber Crime
• 1.3 Common Types of Cyber Crimes
• 1.4 Cyber Crime Statistics
• 1.5 Who Are Cyber Criminals?
• 1.6 Real-World Case Studies
• 1.7 How to Protect Yourself from Cyber Crime

1.1 What is Cyber Crime?

Cyber crime refers to any illegal activity that involves a computer, a networked device, or a network. The computer may be the tool of the crime, the target of the crime, or the evidence of the crime.

In simple terms — any criminal act carried out using digital technology is a cyber crime.

1.2 Categories of Cyber Crime

Cyber crimes are broadly classified into three categories:

A. Crimes Against Individuals

B. Crimes Against Property

C. Crimes Against Government / Society

1.3 Common Types of Cyber Crimes

1.3.1 Hacking

Unauthorised access to a computer system or network.

• Ethical Hacking — done with permission to find vulnerabilities
• Black Hat Hacking — illegal access with malicious intent
• Grey Hat Hacking — unauthorised but without malicious intent

1.3.2 Malware & Ransomware

• Malware: Malicious software (viruses, worms, trojans, spyware)
• Ransomware: A type of malware that encrypts files and demands a ransom to unlock them

1.3.3 Denial of Service (DoS / DDoS)

Flooding a server with traffic to make it unavailable to legitimate users.

• DoS: Attack from a single source
• DDoS (Distributed DoS): Attack from many compromised systems (botnet)

1.3.4 Phishing & Social Engineering

1.3.5 Man-in-the-Middle (MITM) Attack

The attacker secretly intercepts communication between two parties to steal data.

1.3.6 SQL Injection

Injecting malicious SQL code into a web application's database query to access or manipulate data.

1.3.7 Cross-Site Scripting (XSS)

Injecting malicious scripts into web pages viewed by other users.

1.3.8 Password Attacks

1.3.9 Zero-Day Exploit

A vulnerability in software that is unknown to the vendor and has no patch available. Cyber criminals exploit these before developers can fix them.

Zero-day attacks are among the most dangerous because no defence exists at the time of the attack.

1.4 Cyber Crime Statistics (Global Context)

Note: Numbers change rapidly — these illustrate scale.

• A ransomware attack happens every 11 seconds
• 95% of cyber breaches are caused by human error
• Average data breach cost: $4.4 Million USD

1.5 Who Are Cyber Criminals?

1.6 Real-World Case Studies

Case 1: WannaCry Ransomware (2017)

• What happened: A ransomware attack spread globally, affecting 200,000+ computers across 150 countries
• Targets: UK's NHS, FedEx, Deutsche Bahn, and many others
• Method: Exploited a Windows vulnerability (EternalBlue) that had no patch at the time
• Impact: Hospitals cancelled surgeries, operations halted, $4+ Billion in damages
• Lesson: Keep systems updated — Microsoft had already released a patch, but many organisations hadn't installed it

Case 2: Aadhaar Data Leak (India)

• What happened: Personal details of millions of Indian citizens (name, address, Aadhaar number) were exposed through various government portals
• Impact: Increased risk of identity theft and financial fraud
• Lesson: Government databases must be secured, and citizens should be cautious about sharing Aadhaar copies online

Case 3: Phishing Attack on an Indian Bank (2021)

• What happened: Customers received fake SMS/emails asking them to "update" their KYC details
• Impact: Crores of rupees stolen from bank accounts
• Lesson: Banks never ask for OTP/password over email or SMS — verify before clicking

1.7 How to Protect Yourself from Cyber Crime

1. Use strong, unique passwords for every account — use a password manager
2. Enable Two-Factor Authentication (2FA)
3. Keep software updated — OS, browser, antivirus
4. Do not click suspicious links or download unknown attachments
5. Use a firewall and antivirus software
6. Back up important data regularly (3-2-1 rule: 3 copies, 2 media types, 1 offsite)
7. Be careful what you share on social media
8. Use HTTPS websites only (look for the lock icon)
9. Secure your home Wi-Fi with WPA3 or WPA2 encryption
10. Report cyber crimes to the appropriate authorities