The Rootkit Arsenal amzn.com

The Art of Memory Forensics amzn.com

Practical Reverse Engineering amzn.com

Malware Analyst's Cookbook and DVD amzn.com

Real Digital Forensics amzn.com

Rootkits and Bootkits amazon.com

Malware Search+++ addons.mozilla.org

AbuseIPDB abuseipdb.com

ISIS Lab github.com

CTF Wiki by Isis lab.

Frida github.com

Dynamic Code Injection.

CTF write-ups (community) github.com

CTF challenges + write-ups archive maintained by the community.

StegOnline georgeom.net

Conduct a wide range of image steganography operations, such as concealing/revealing files hidden within bits (open-source).

Outguess freebsd.org

Universal steganographic tool.

Extundelete extundelete.sourceforge.net

Used for recovering lost data from mountable images.

Exploit.Education exploit.education

Variety of VMs to learn variety of computer security issues.

Exploit Exercises exploit-exercises.lains.space

Variety of VMs to learn variety of computer security issues.

Exiv2 exiv2.org

Image metadata manipulation tool.

How to Get Started in CTF endgame.com

Short guideline for CTF beginners by Endgame

echoCTF.RED echoctf.red

Online CTF with a variety of targets to attack.

CTF Resources ctfs.github.io

Start Guide maintained by community.

Viblo CTF ctf.viblo.asia

Various amazing CTF challenges, in many different categories. Has both Practice mode and Contest mode.

Crackmes crackmes.one

Reverse Engineering Challenges.

CSWSH cow.cat

Cross-Site WebSocket Hijacking Tester.

Cheatsheet comparitech.com

Postman chrome.google.com

Add on for chrome for debugging network requests.

Captf captf.com

Dumped CTF challenges and materials by psifertex.

Stegsolve caesum.com

Apply various steganography techniques to images.

Xxxswf bitbucket.org

A Python script for analyzing Flash files.

Bamboofox bamboofox.github.io

Chinese resources to learn CTF.

Backdoor backdoor.sdslabs.co

Security Platform by SDSLabs.

BackBox backbox.org

Based on Ubuntu.

AperiSolve aperisolve.fr

Aperi'Solve is a platform which performs layer analysis on image (open-source).

Hackbar addons.mozilla.org

Firefox addon for easy web exploitation.

Registry Viewer® accessdata.com

Used to view Windows registries.

PicoCTF 2019game.picoctf.com

All year round ctf game. Questions from the yearly picoCTF competition.

Year of the Rabbit tryhackme.com

Can you hack into the Year of the Rabbit box without falling down a hole.

Year of the Owl tryhackme.com

Owl-themed boot to root machine.

Yara tryhackme.com

Intro to yara for malware analysis.

Intro Windows Reversing tryhackme.com

Intro to Windows RE.

Windows Privesc Arena tryhackme.com

Students will learn how to escalate privileges using a very vulnerable Windows 7 VM.

Windows Fundamentals tryhackme.com

Intro to Windows.

Windows Privesc tryhackme.com

Students will learn how to escalate privileges using a very vulnerable Windows 7 VM.

Windows x64 Assembly tryhackme.com

Introduction to x64 Assembly on Windows.

Vulnversity tryhackme.com

Learn about active recon, web app attacks and privilege escalation.

Threat Intelligence Tools tryhackme.com

Explore different OSINT tools used to conduct security threat assessments and investigations.

Theseus tryhackme.com

The first installment of the SuitGuy series of very hard challenges.

The Great Escape (Docker) tryhackme.com

Escaping Docker container.

The Cod Caper tryhackme.com

A guided room taking you through infiltrating and exploiting a Linux system.

Sudo Security Bypass tryhackme.com

A tutorial room exploring CVE-2019-14287 in the Unix Sudo Program. Room One in the SudoVulns Series.

Sudo Buffer Overflow tryhackme.com

A tutorial room exploring CVE-2019-18634 in the Unix Sudo Program. Room Two in the SudoVulns Series.