🐴 Trojan Horses

Learn how attackers disguise malicious software as legitimate applications and why social engineering remains one of the most effective attack techniques.

🚨 Incident Report

An employee needs a PDF converter.

Instead of downloading from the vendor website, they search online and install a free version.

The software appears to work.

A week later:

• Credentials are stolen
• Sensitive files are accessed
• Unauthorized logins appear

The converter was actually a Trojan.

📖 What Is A Trojan Horse?

A Trojan Horse is malware that disguises itself as legitimate software.

Looks Safe
Acts Maliciously

Unlike viruses and worms, Trojans generally do not self-replicate.

Their success depends on deception.

🏛 Why The Name Trojan Horse?

The term comes from the famous Greek story:

A large wooden horse appeared to be a gift.

Hidden inside were soldiers.

The same concept applies to Trojan malware.

The danger is hidden behind something trusted.

🐴 Common Trojan Types

• Remote Access Trojans (RATs)
• Banking Trojans
• Downloader Trojans
• Backdoor Trojans
• Credential Theft Trojans

Each Trojan has a different objective.

🎮 Remote Access Trojans (RATs)

RATs attempt to provide attackers with unauthorized remote control capabilities.

Potential actions may include:

• Viewing system information
• Managing files
• Monitoring activity
• Collecting information

These are among the most commonly discussed Trojan categories.

🏦 Banking Trojans

Banking Trojans focus on:

• Financial information
• Account credentials
• Payment systems

Their primary goal is usually financial gain.

📨 Common Delivery Methods

• Fake software installers
• Cracked applications
• Email attachments
• Fake updates
• Malicious advertisements

Social engineering is often more important than technical sophistication.

🚩 Red Flags

• Software from unknown publishers
• Unexpected installation prompts
• Disabled security software
• Unusual outbound connections
• Unexpected system behavior

These indicators warrant investigation.

🛠 Security Analyst Toolkit

Common investigation tools:

• Process Explorer
• Autoruns
• TCPView
• Wireshark
• VirusTotal
• Sysmon

Analysts use these tools to investigate suspicious software behavior.

🌎 Why Trojans Are So Effective

Attackers often don’t need advanced exploits.

If they can convince users to install malicious software voluntarily, many security controls become less effective.

Trust is often the primary target.

⚔ Virus vs Worm vs Trojan

🎓 CEH Exam Focus

• Trojans disguise themselves as legitimate software
• Trojans rely heavily on social engineering
• RATs are a common Trojan category
• Trojans generally do not self-replicate
• User awareness is a critical defense

🏆 Key Lesson

Viruses exploit files.

Worms exploit connectivity.

Trojans exploit trust.

Verify The Source
Before You Install

🔒 Ransomware Operations

Learn how ransomware evolved into a multi-billion-dollar criminal industry and how defenders prepare for one of the most disruptive cyber threats today.