🦑

DSA is so easy when you follow these 6 steps:

𝟭. 𝗙𝗼𝗰𝘂𝘀 𝗼𝗻 𝗗𝗲𝗽𝘁𝗵 𝗼𝘃𝗲𝗿 𝗕𝗿𝗲𝗮𝗱𝘁𝗵:
- Don't solve 500 coding problems aimlessly. Master around 100 core problems deeply instead.
- 40 Problems on Array, Strings, LinkedList, Stack & Queue, Binary search, Trees, Graph, Sorting and Searching: https://lnkd.in/djnaPkeD
- 40 Problems on Dynamic Programming (DP), Backtracking, Hashing, Heap, Tries, and Greedy Algorithms: https://lnkd.in/dF3h-Khk

𝟮. 𝗖𝗿𝗲𝗮𝘁𝗲 𝗮 𝗹𝗶𝘀𝘁 𝗼𝗳 𝗸𝗲𝘆 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀:
- Use resources like "Strivers A2Z DSA Sheet" by Raj Vikramaditya to curate around 100 core problems.
- https://lnkd.in/dQMGy9zF (Strivers)

𝟯. 𝗠𝗮𝘀𝘁𝗲𝗿 𝗲𝗮𝗰𝗵 𝗱𝗮𝘁𝗮 𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲:
- Understand and implement them by hand. Know how they work internally to ace interview questions.
- Fundamentals, Intermediate, Advance DSA topics: https://lnkd.in/d4ws9xfr

𝟰. 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝘄𝗶𝘁𝗵 𝗦𝗽𝗮𝗰𝗲𝗱 𝗥𝗲𝗽𝗲𝘁𝗶𝘁𝗶𝗼𝗻:
- Revisit problems after 3 days, a week, and 15 days. Break down solutions instead of rote memorization.
- 3:7:15 Rule for DSA: https://lnkd.in/dW6a8wcg

𝟱. 𝗜𝗱𝗲𝗻𝘁𝗶𝗳𝘆 𝗿𝗲𝘂𝘀𝗮𝗯𝗹𝗲 𝘁𝗲𝗰𝗵𝗻𝗶𝗾𝘂𝗲𝘀 𝗮𝗻𝗱 𝗰𝗼𝗱𝗲 𝗯𝗹𝗼𝗰𝗸𝘀:
- Isolate common patterns like Binary Search or Depth First Search for focused practice.
- 20 DSA patterns: https://lnkd.in/d9GCezMm
- 14 problem solving patterns: https://lnkd.in/daysVFSz
- DSA questions patterns: https://lnkd.in/d3rRHTfE

𝟲. 𝗘𝘅𝗽𝗮𝗻𝗱 𝗶𝗻𝘁𝗼 𝗕𝗿𝗲𝗮𝗱𝘁𝗵:
- Once you've mastered core problems and techniques, tackle a wider range of questions. Keep it realistic and relevant to interview scenarios.
- 16 Important algorithms problems: https://lnkd.in/dfjm8ked
- Tips to solve any DSA question by understanding patterns: https://lnkd.in/d9GVyfBY

Additional tips
Practice on paper: Practice whiteboard interviews to improve your planning and coding skills without relying on an IDE. It’s a practical way to get ready for real interviews.

Ref: Rajat Gajbhiye
@UndercodeCommunity
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🦑🔍 Mastering DNS & DHCP Penetration Testing: Protect Your Network’s Core!

DNS (Domain Name System) and DHCP (Dynamic Host Configuration Protocol) are foundational to network operations. However, their vulnerabilities can make them prime targets for cyberattacks. Understanding how to test and secure these protocols is a critical skill for any cybersecurity professional.

Common DNS Vulnerabilities & Attacks:

1️⃣ DNS Spoofing/Poisoning: Alters DNS responses to redirect users to malicious websites.
2️⃣ DNS Tunneling: Exfiltrates data or establishes backdoors via DNS queries.
3️⃣ Cache Poisoning: Manipulates DNS cache entries to disrupt or redirect traffic.
4️⃣ Zone Transfer Exploitation: Misuses misconfigured servers to access sensitive DNS records.

Common DHCP Vulnerabilities & Attacks:

1️⃣ DHCP Starvation Attack: Exhausts IP leases, causing network disruptions.
2️⃣ Rogue DHCP Server Attack: Deploys unauthorized DHCP servers to provide malicious configurations.
3️⃣ Man-in-the-Middle (MITM) Attacks: Exploits DHCP to intercept sensitive data.
4️⃣ IP Address Spoofing: Mimics authorized devices to gain network access.

Steps to Perform DNS & DHCP Penetration Testing:

1️⃣ Reconnaissance:
• Use tools like Dig, DNSRecon, and Fierce to identify DNS configurations.
• Scan for active DHCP servers using DHCPig or Yersinia.

2️⃣ Vulnerability Analysis:
• Check for weak configurations in DNS records (e.g., open zone transfers).
• Identify rogue DHCP servers or insufficient IP allocations.

3️⃣ Exploitation:
• Simulate DNS Spoofing or Cache Poisoning to test resilience.
• Perform DHCP Starvation or Rogue Server attacks in a controlled environment.

4️⃣ Remediation:
• Harden DNS configurations (disable unused services, restrict zone transfers).
• Enable DHCP snooping and IP source guard to prevent rogue DHCP servers.

Pro Tip for Defenders:
• Implement DNSSEC (Domain Name System Security Extensions) to validate DNS responses.
• Regularly monitor and test DHCP and DNS servers for vulnerabilities.

📌 Remember: Always test ethically with proper authorization!

🔐 DNS and DHCP are the backbone of every network. Securing them not only prevents breaches but ensures smooth operations for businesses.

🦑Cookie stealer which can then be used for session hijacking and Bypassing 2 Factor Authentication:

>> How Does it work?
Big-Papa utilizes malicious javascript code injection...and then makes a GET Request(with cookies) to the Python Web server running on the attacker machine

Note That you need to be man in the middle in order to inject the malicious javascript Code and then steal cookies of the website that the victim is currently visting

For testing purposes copy the Javascript code from the bgp.js file without the script tags and execute in the console of the browser

You can use Bettercap in-order to become man-in-the-middle using bettercap or use arp spoof and then run Big-Papa to inject Javascript

>> For HTTPS?
Big-Papa will work Perfectly against HTTP websites but For HTTPS you can use sslstrip to Downgrade it to HTTP and then utilize Big-Papa

*SSLstrip --> https://github.com/moxie0/sslstrip.git

Still some websites use HTTP and thus their data including Passwords can be read in Clear text but we need to steal cookies in some cases in order to Bypass 2-Factor-Authentication

🄸🄽🅂🅃🄰🄻🄻🄸🅂🄰🅃🄸🄾🄽 & 🅁🅄🄽 :

1️⃣ git clone https://github.com/vrikodar/Big-Papa.git

2️⃣cd Big-Papa

3️⃣chmod +x install.sh

4️⃣ ./install.sh

@UndercodeCommunity
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Useful ?

🦑𝗦𝗢𝗣𝘀 (𝗦𝘁𝗮𝗻𝗱𝗮𝗿𝗱 𝗢𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻 𝗣𝗿𝗼𝗰𝗲𝗱𝘂𝗿𝗲𝘀) / 𝗣𝗹𝗮𝘆𝗯𝗼𝗼𝗸𝘀 / 𝗥𝘂𝗻𝗯𝗼𝗼𝗸𝘀✨

A playbook, also known as a standard operating procedure (SOP), consists of a set of guidelines to handle security incidents and alerts in the SOC.

Incident response methodologies typically involve creating standard operating procedures (SOPs), playbooks, and runbooks to guide teams through the incident response process.

These gudelines provide easy to use operational incident best practices. These cheat sheets are dedicated to incident handling and cover multiple fields in which a CERT team can be involved.

Source: https://lnkd.in/eudq_jJi
Thanks to Societe Generale

✅Worm Infection: https://lnkd.in/ez-kq98Y
✅Social Engineering: https://lnkd.in/e_FJbxDP
✅Information Leakage: https://lnkd.in/eeN8KX8g
✅Insider Abuse: https://lnkd.in/ep4p_THk
✅Customer Phishing: https://lnkd.in/ekTfY7vz
✅Scam: https://lnkd.in/eUHwG3fF
✅Trademark infringement: https://lnkd.in/e3P3xfeb
✅Phishing: https://lnkd.in/eYTi3RQ8
✅Ransomware: https://lnkd.in/eRkctdQn
✅Large_scale_compromise: https://lnkd.in/eYFF43b4
✅3rd-party_compromise: https://lnkd.in/e8SAu5MT
✅Windows Intrusion: https://lnkd.in/eXCpcx9V
✅Unix Linux lntrusionDetection: https://lnkd.in/eHkm6MMe
✅DDOS: https://lnkd.in/eQ7zZzVt
✅MaliciousNetworkBehaviour: https://lnkd.in/ewVZy2cs
✅Website-Defacement: https://lnkd.in/eraNiHcH
✅WindowsMalwareDetection: https://lnkd.in/ewEx_C6Y
✅Blackmail: https://lnkd.in/eW3zGcPs
✅SmartphoneMalware.pdf: https://lnkd.in/ezjyY4G9

Ref:
@UndercodeCommunity
▁ ▂ ▄ U𝕟𝔻Ⓔ𝐫Ć𝔬𝓓ⓔ ▄ ▂ ▁

🦑Free AI image to video + Offline models :

https://huggingface.co/collections/neox1969/image-to-video-65471876af5d7944323566f5

🦑𝐀 𝐅𝐫𝐞𝐞 𝐀𝐜𝐭𝐢𝐯𝐞 𝐃𝐢𝐫𝐞𝐜𝐭𝐨𝐫𝐲 𝐏𝐞𝐧𝐭𝐞𝐬𝐭 𝐋𝐀𝐁𝐬!

Game of Active Directory is an Open-Source project developed by Orange Cyber Defense that provides a vulnerable Active Directory environment.

It's designed for security professionals to practice and improve their skills in a controlled setting:

• Hands-on learning without risking a production environment.
• Opportunity to explore advanced attack and defense techniques.
• Offers a cost-effective way to build cybersecurity expertise.
• Facilitates a deeper understanding of AD security best practices.

Source: https://lnkd.in/gxN-_nTw

Kindly note that GOAD is intentionally designed to be highly vulnerable. It is strongly advised to refrain from replicating its configuration for production environments.

GOAD helps threat hunters simulate AD attacks, refine detection skills, and test response strategies in a safe, controlled environment.

Discover over 10+ essential data analysis techniques for effective threat hunting in my "Cyber Threat Hunt 101" YouTube series, explained simply: https://lnkd.in/gkVB6B2j

@UndercodeCommunity
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🦑Free 3D models urls List:

https://sketchfab.com/
https://www.cgtrader.com/free-3d-models
https://www.turbosquid.com/
https://free3d.com/
https://www.thingiverse.com/
https://www.blendswap.com/
https://polyhaven.com/
https://threedscans.com/
https://grabcad.com/
https://3dwarehouse.sketchup.com/
https://archive3d.net/
https://www.models-resource.com/
https://clara.io/
https://3dsky.org/
https://www.renderhub.com/free-3d-models
https://www.sharecg.com/
https://3drt.com/
https://www.yeggi.com/
https://www.cadnav.com/
https://3dmdb.com/

@UndercodeCommunity
▁ ▂ ▄ U𝕟𝔻Ⓔ𝐫Ć𝔬𝓓ⓔ ▄ ▂ ▁

🦑Real Ethical Hacking in 43 Hours: Your Fast-Track to Cybersecurity Mastery
Elevate your cybersecurity career with our comprehensive ethical hacking course.
Key Topics Covered:

* Ethical Hacking Foundations
* Introduction to Ethical Hacking
* Ethical Hacking Steps
* Creating Your Ethical Hacking Lab
* Operating System Fundamentals
* Vulnerability Assessment
* OSINT Techniques
* Storage Media
* Linux Basics
* Linux Shell
* Linux Processes
* Linux Permissions
* Network Security Concepts
* Packet Management Systems
* Network Security
* Linux File System
* Working with Archives
* Working with Processes
* Working with Users
* Networking Fundamentals
* Network Capture
* Network Scanning
* Advanced Networking Topics
* Information Gathering
* Web Application Hacking
* Detecting Web Vulnerabilities
* The Importance of Programming
* C++ and C
* SQL and Relational Databases
* Functions in C++
* Ethical Hacking for Data Scientists
* Ethical Hacking for SQL Datatypes
* Learning Python for Ethical Hacking

Gain hands-on experience with industry-standard tools like Kali Linux, Metasploit, and Nmap. Prepare for and ace certifications like CSEH and CEH.

Download Link: https://lnkd.in/dnXx6G6H

@UndercodeCommunity
▁ ▂ ▄ U𝕟𝔻Ⓔ𝐫Ć𝔬𝓓ⓔ ▄ ▂ ▁

🦑1)JS-Tap: Weaponizing JavaScript for Red Teams
https://lnkd.in/gKUUNrKN

2)Automating the Setup of a Bug Bounty Toolkit
https://lnkd.in/gkAN5KJh

3)VOIP Penetration Testing Checklist
https://lnkd.in/gz6iJqG8

4)Find Website Vulnerabilities with One Hacking Tool
https://lnkd.in/giNT2tGr

5)Easy Way To Root Your Virtual Device :)
https://lnkd.in/gTCX9_Zk

6)LetsDefend Walkthrough: Kernel Exploit Challenge
https://lnkd.in/gWjzjUaN

7)TryHackMe Writeup — Corridor
https://lnkd.in/g462KWdP

8)HTB: Editorial Writeup / Walkthrough
https://lnkd.in/gCQgrzy4

9)Lookup THM Walkthrough
https://lnkd.in/gk87hb_H

10)ITI + CyberTalents DFIR Bootcamp CTF Write ups
https://lnkd.in/gpTJuVim

Ref: Saumadip Mandal
@UndercodeCommunity
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