You're reading from Incident Response Techniques for Ransomware Attacks Understand modern ransomware attacks and build an incident response strategy to work through them

Product type Paperback

Published in Apr 2022

Publisher Packt

ISBN-13 9781803240442

Length 228 pages

Edition 1st Edition

Concepts

Cybersecurity

Author (1):

Oleg Skulkin

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Table of Contents (17) Chapters

Preface

1. Section 1: Getting Started with a Modern Ransomware Attack

2. Chapter 1: The History of Human-Operated Ransomware Attacks FREE CHAPTER

3. Chapter 2: The Life Cycle of a Human-Operated Ransomware Attack

4. Chapter 3: The Incident Response Process

5. Section 2: Know Your Adversary: How Ransomware Gangs Operate

6. Chapter 4: Cyber Threat Intelligence and Ransomware

7. Chapter 5: Understanding Ransomware Affiliates' Tactics, Techniques, and Procedures

8. Chapter 6: Collecting Ransomware-Related Cyber Threat Intelligence

9. Section 3: Practical Incident Response

10. Chapter 7: Digital Forensic Artifacts and Their Main Sources

11. Chapter 8: Investigating Initial Access Techniques

12. Chapter 9: Investigating Post-Exploitation Techniques

13. Chapter 10: Investigating Data Exfiltration Techniques

14. Chapter 11: Investigating Ransomware Deployment Techniques

15. Chapter 12: The Unified Ransomware Kill Chain

16. Other Books You May Enjoy

REvil ransomware overview

First, REvil collects information about the system and fingerprints it. Before starting the encryption process, it kills a list of processes according to its configuration.

Configuration data is stored in resources in encrypted form. The key is 32 bytes long and located before the encrypted data:

Figure 11.14 – The key used to encrypt configuration data

Once the processes are killed, it removes shadow copies, so they can't be used for data recovery.

It encrypts files using curve25519/Salsa20. The key is encrypted with curve25519/AES-256-CTR. REvil adds a custom extension to encrypted files, for example, .1qu4746az.

It also changes the desktop wallpaper (dropped to the %Temp% directory) and creates ransom notes in all directories with encrypted files.

To achieve persistence, REvil modifies the SOFTWARE\Microsoft\Windows\CurrentVersion\Run registry key.

Abusing Administrative shares isn't the only technique...

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You're reading from Incident Response Techniques for Ransomware Attacks Understand modern ransomware attacks and build an incident response strategy to work through them

Table of Contents (17) Chapters

REvil ransomware overview

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You're reading from Incident Response Techniques for Ransomware Attacks Understand modern ransomware attacks and build an incident response strategy to work through them

Table of Contents (17) Chapters

REvil ransomware overview

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