Emotet Malware Lecture Notes

Introduction to Emotet

• Emotet is a type of malware initially developed as a banking Trojan.
• It aims to access devices to spy on sensitive data.
• Known for evading basic antivirus detection and spreading like a worm.

How Emotet Spreads

• Primarily through spam emails containing malicious links/documents.
• Emails appear authentic, tricking users into downloading malware.

Evolution and Functionality

• Detected in 2014 targeting German and Austrian banks.
• Evolved into a "Dropper" reloading additional malware like TrickBot (banking Trojan) and Ryuk (ransomware).
• Emotet's goal often involves extorting money by threatening to leak encrypted data.

Target Audience

• Targets both individuals and organizations, including hospitals and universities.
• Initially focused on organizations, now primarily affecting individuals.

Affected Devices

• Initially targeted Windows OS, later expanded to include Apple devices.
• Spread via fake Apple support emails, exploiting fears of account restriction.

Distribution Methods

• Uses "Outlook harvesting" to create legitimate-looking phishing emails.
• Spreads further in networks by cracking passwords and exploiting vulnerabilities like EternalBlue and DoublePulsar.

Developers and Motivation

• Developers allegedly sublease Emotet to other parties for financial gain.
• Labeled as cybercrime rather than espionage by German BSI.

Emotet's Impact

• The US Department of Homeland Security considers it costly and destructive, cleanup costing around $1 million per incident.
• Polymorphic nature makes it difficult to detect, changing its code frequently.
• Recently adapted to attack Wi-Fi networks.

Prevention and Protection

• Regular updates and security patches for systems.
• Comprehensive antivirus programs like Kaspersky Internet Security.
• Avoid downloading dubious attachments or clicking suspicious links.
• Regular data backups and usage of strong passwords with two-factor authentication.
• Display file extensions to identify potentially harmful files.

Handling an Infection

• Isolate infected computers and inform contacts.
• Change all login credentials using an uninfected device.
• Clean all network devices one by one with antivirus software.

EmoCheck Tool

• Tool to detect potential Emotet infection, but cannot guarantee 100% accuracy due to the virus's polymorphic nature.

Final Thoughts

• Emotet is a highly dangerous malware with no absolute protection.
• Measures can reduce infection risk, but vigilance and comprehensive antivirus are essential.

Related Topics

• Understanding Trojan viruses, WannaCry ransomware, ransomware types, and prevention methods.