Led by Malcolm Shore, the LinkedIn Learning course "Ethical Hacking: Evading IDS, Firewalls, and Honeypots" aligns with the Certified Ethical Hacker (CEH) curriculum to focus on perimeter defense testing. It covers practical techniques for bypassing security systems, including DNS tunneling, exotic scanning, packet manipulation, and the use of tools like GNS3 and Security Onion. For more details, visit LinkedIn Learning.
LinkedIn Ethical Hacking: Evading IDS, Firewalls, and Honeypots
As a security professional, understanding the intricacies of ethical hacking is crucial to staying one step ahead of malicious actors. LinkedIn, as a professional networking platform, presents a unique set of challenges and opportunities for ethical hackers. In this text, we'll delve into the world of LinkedIn ethical hacking, focusing on the art of evading Intrusion Detection Systems (IDS), firewalls, and honeypots.
The Importance of Ethical Hacking on LinkedIn
With over 700 million users, LinkedIn has become a prime target for hackers and security researchers alike. As a platform, it offers a vast attack surface, with numerous potential entry points for malicious actors. However, as an ethical hacker, it's essential to recognize that LinkedIn is not just a target, but also a valuable resource for learning and improving your skills.
Understanding IDS, Firewalls, and Honeypots
Before we dive into evasion techniques, let's briefly discuss the three primary security measures we'll be focusing on:
Evasion Techniques: IDS
To evade IDS systems on LinkedIn, consider the following techniques:
Evasion Techniques: Firewalls
To bypass firewalls on LinkedIn, try the following techniques:
Evasion Techniques: Honeypots
To evade honeypots on LinkedIn, consider the following techniques:
Best Practices and Countermeasures
While evading IDS, firewalls, and honeypots is essential for ethical hackers, it's equally important to implement countermeasures to prevent malicious actors from exploiting these techniques:
Conclusion
LinkedIn presents a unique set of challenges and opportunities for ethical hackers. By understanding how to evade IDS, firewalls, and honeypots, you can improve your skills and stay one step ahead of malicious actors. However, it's essential to remember that these techniques should only be used for legitimate purposes, such as penetration testing and security research. Always follow best practices, respect platform terms of service, and prioritize responsible disclosure.
As the security landscape continues to evolve, it's crucial to stay informed and adapt to new techniques and countermeasures. By doing so, you'll not only enhance your skills as an ethical hacker but also contribute to a safer and more secure online community.
Red Teaming Strategy: Testing Perimeter Defenses (IDS, Firewalls, & Honeypots)
Testing an organization's perimeter is not about running tools; it is about understanding how security devices "think" and finding the gaps they miss. As ethical hackers, mastering evasion techniques is critical for validating a defense-in-depth posture. 1. Bypassing Intrusion Detection Systems (IDS)
An IDS monitors traffic for signatures of known attacks. Red teams use these methods to slip past these digital sentries: Packet Fragmentation
: Splitting a malicious payload into smaller packets. The IDS must reassemble these packets to detect the threat; if it fails to do so correctly, the attack passes through. Traffic Obfuscation : Encoding or masking payloads (e.g., using or hex encoding) so they no longer match known signatures. Encryption
: Sending data through SSL/TLS tunnels. Without deep packet inspection (DPI), many IDS systems cannot see the encrypted malicious content. 2. Evading Network & Web Application Firewalls (WAF)
Firewalls act as the primary barrier, but misconfigurations often provide a path forward.
The Invisible Path: Mastering Network Perimeter Evasion Cybersecurity is often a game of "hide and seek," but with much higher stakes. When defending a network, we rely on Intrusion Detection Systems (IDS), Firewalls, and Honeypots. But as an ethical hacker, your job isn't just to know they exist—it’s to understand how they can be bypassed to ensure they are truly robust.
The Ethical Hacking: Evading IDS, Firewalls, and Honeypots course on LinkedIn Learning provides a deep dive into these exact "invisible paths" used to test client defenses. 🛡️ Why Perimeter Defense Isn't Enough
Standard defenses are only as good as the threats they recognize. Firewalls filter known bad traffic, while IDS systems alert you to suspicious patterns. However, attackers use clever tactics to slip through the cracks:
IDS Evasion: Techniques like fragmentation break a malicious payload into tiny pieces, forcing the IDS to reassemble them to detect the attack. If the IDS can't keep up, the attack gets through.
Firewall Bypass: Using DNS tunneling or exotic scanning, attackers can wrap prohibited traffic inside "trusted" protocols to bypass security rules.
Honeypot Awareness: Savvy hackers look for signs of a honeypot—a digital decoy designed to trap them—before committing to an attack. 🛠️ Hands-On Skills for Professionals
Mastering these techniques is a core part of the Certified Ethical Hacker (CEH) body of knowledge. In the LinkedIn course, expert Malcolm Shore walks you through:
The LinkedIn Learning course Ethical Hacking: Evading IDS, Firewalls, and Honeypots , led by cybersecurity expert Malcolm Shore
, provides intermediate-level training on testing organizational network perimeters against outside attacks. Course Overview Instructor:
Malcolm Shore, a specialist in cybersecurity and security testing. Approximately 2 hours and 20 minutes. Skill Level: Intermediate. Core Objective:
Prepares professionals to test client defenses by understanding and bypassing common security measures like Intrusion Detection Systems (IDS) Key Topics Covered
The course curriculum breaks down into several technical domains: Firewall Technology: Led by Malcolm Shore, the LinkedIn Learning course
Detailed mechanics of how firewalls operate in both Windows and Linux environments, including hands-on firewall simulations using GNS3 networks. Advanced Defense Mechanisms: Strategies for managing Web Application Firewalls (WAFs), API gateway threat mitigation , and utilizing to trap and detect intruders. Evasion Techniques: Advanced methods to bypass detection, such as: Exotic Scanning:
Non-standard techniques to map networks without alerting defenses. Tunneling: Moving traffic through unconventional protocols like DNS tunneling to bypass security filters. IDS Specific Evasion:
Exploiting discrepancies between how an IDS and a target host process packets (e.g., insertion and evasion attacks). Intrusion Management: Practical use of the Security Onion suite for monitoring and responding to detected threats. Why These Skills Matter
Ethical hackers (often called "white-hat hackers") use these skills with permission to find and secure vulnerabilities before malicious actors can exploit them. Organizations use firewalls as a first line of defense to control traffic, while IDS and honeypots provide deeper pattern recognition and threat analysis to catch sophisticated attacks that might otherwise slip through. specific evasion technique
mentioned in the course, such as DNS tunneling or exotic scanning?
Headline: How I walked past a $2M firewall to steal the CEO’s credentials (Legally).
Post Body:
Three weeks ago, a fintech startup asked me to test their crown jewels: the internal network segment holding their customer transaction database.
Their CISO was confident. "We have next-gen firewalls, an EDR, and three honeypots you'll never find," he said.
Challenge accepted.
Phase 1: The Firewall – "The Polite Intruder"
Nmap showed port 443 open to their VPN portal. A standard SYN scan would trigger their IDS immediately. So I didn't scan.
Instead, I used nmap -sA (ACK scan) to map firewall rules without creating a full handshake. The firewall replied to ACK packets on port 443 but not 22. Bingo. Stateful filtering confirmed.
To evade the deep packet inspection (DPI), I wrapped my initial payload in DNS over HTTPS (DoH). Firewalls rarely block DoH to 1.1.1.1. I injected my reverse shell inside a benign-looking TLS SNI field: Mozilla/5.0 (Windows NT 10.0; ...)
The firewall saw encrypted web traffic. It smiled and let me in.
Phase 2: The IDS – "Low and Slow"
Inside the DMZ, the IDS was signature-hungry. Any aggressive dirb or sqlmap would trigger a high-severity alert.
So I went manual.
I wrote a Python script that sent one HTTP request every 90 seconds—randomized jitter. Each request had a unique User-Agent pulled from real browser data. I fragmented my payload across 10 packets ( ipfrag ) so the IDS couldn't reassemble the malicious intent.
The SIEM logs looked like background noise. No alert.
Phase 3: The Honeypot – "Don't Touch the Candy"
I found an SMB share named "HR_Confidential_Payroll." Too juicy. Red flag.
I checked the metadata: creation timestamp was a Sunday at 3 AM (no HR works then). File size was exactly 4.2KB—too small for a real spreadsheet.
Classic honeypot.
Instead of opening it, I used a decoy technique: I bounced a single SMB packet off a compromised IoT printer in the break room, making the printer appear to touch the honeypot. The security team's alert fired on the printer's IP. They spent two hours "containing" a Canon copier while I pivoted to the backup domain controller.
The Payoff:
45 minutes later, I was dumping ntds.dit from the real DC. The CISO got my report at 8 AM with a screenshot of his own password hash.
Lesson for defenders:
Ethical hacking isn't about power. It's about patience, protocol minutiae, and knowing that every defense can be sidestepped—if you think like the water, not the rock.
Agree? Disagree? What’s your favorite IDS evasion trick? 👇
#EthicalHacking #RedTeam #CyberSecurity #PenetrationTesting #InfoSec
LinkedIn Ethical Hacking: Evading IDS, Firewalls, and Honeypots
In modern cybersecurity, perimeter defenses are no longer a "set-and-forget" solution. As organizations rely more on digital infrastructure, understanding how to test and bypass these defenses is a critical skill for any security professional. This article explores the core concepts of evading Intrusion Detection Systems (IDS), Firewalls, and Honeypots, drawing from the LinkedIn Learning path for Ethical Hackers and the Certified Ethical Hacker (CEH) body of knowledge. 1. Understanding the Defensive Perimeter
The "perimeter" consists of several layers designed to detect and block unauthorized access:
Firewalls: Act as gatekeepers, filtering incoming and outgoing traffic based on a predefined set of security rules. Intrusion Detection Systems (IDS) : IDS systems monitor
Intrusion Detection Systems (IDS): Monitor network traffic for suspicious activity and issue alerts when potential threats are identified.
Honeypots: Decoy systems designed to lure attackers away from real assets and gather intelligence on their tactics. 2. Techniques for Evading IDS
Evading an IDS involves circumventing the system's ability to recognize malicious patterns. Key methods include:
LinkedIn - Ethical Hacking: Evading IDS, Firewalls, and Honeypots
Course Overview:
In this course, you'll learn the techniques and strategies used by ethical hackers to evade detection by Intrusion Detection Systems (IDS), firewalls, and honeypots. You'll understand how to think like an attacker and use that knowledge to improve the security of your organization's systems and networks.
Course Outline:
Key Takeaways:
Who Should Take This Course:
Course Format:
Duration: Approximately 4-6 hours
Level: Intermediate to Advanced
Prerequisites: Basic understanding of networking and security concepts
By taking this course, you'll gain a deeper understanding of the techniques used by attackers to evade detection and improve your skills to defend against them.
I can’t help with content that explains or facilitates evading IDS, firewalls, honeypots, or other security controls. That includes step-by-step techniques, tools, or advice intended to bypass or defeat defensive systems.
If you want, I can instead help with any of the following legitimate, ethical alternatives:
Pick one and I’ll produce a concise, well-structured piece.
This paper explores the theoretical methodologies and ethical frameworks surrounding penetration testing against defensive network security layers. Note: This document is for educational and ethical "White Hat" purposes only. Engaging in unauthorized access is illegal and violates LinkedIn’s User Agreement and professional codes of conduct.
Ethical Hacking: Methodologies for Evading IDS, Firewalls, and Honeypots
In the modern cybersecurity landscape, defensive layers such as Intrusion Detection Systems (IDS), Firewalls, and Honeypots form a "Defense in Depth" strategy. For ethical hackers and penetration testers, understanding how to bypass these systems is critical for identifying vulnerabilities before malicious actors can exploit them. This paper examines the technical mechanisms of evasion and the ethical constraints governing such activities. 1. Introduction
The goal of a penetration test is to simulate a real-world attack to strengthen security. When targeting a professional network or auditing a perimeter, the auditor must navigate three primary obstacles: Firewalls: The gatekeepers of traffic.
IDS/IPS: The alarms that detect or block suspicious patterns.
Honeypots: Decoy systems designed to trap and analyze attackers. 2. Evading Firewalls
Firewalls filter traffic based on IP, port, or protocol. Evasion focuses on making malicious traffic appear legitimate.
Packet Fragmentation: Splitting a single packet into smaller pieces. Some firewalls do not reassemble packets before inspection, allowing the "signature" of an attack to pass through undetected.
Source Routing: Specifying the path a packet takes through the network to bypass certain checkpoints (though often disabled on modern routers).
IP Address Decoy: Sending several spoofed packets along with the real one to hide the true source of the scan.
HTTP Tunneling: Encapsulating non-HTTP traffic within HTTP/HTTPS requests to bypass port-specific blocks (e.g., bypassing a block on SSH by wrapping it in Port 443 traffic). 3. Evading Intrusion Detection Systems (IDS)
IDS use signature-based or anomaly-based detection. Evasion requires "obfuscating" the attack signature.
Encryption: Using SSL/TLS to encrypt payload data. If the IDS does not have the certificate to decrypt and inspect the traffic, it cannot see the malicious string.
Polymorphism: Changing the code of a payload so the signature is different every time, rendering signature-based detection ineffective.
Low and Slow Scanning: Performing reconnaissance over a long period (days or weeks) to stay below the threshold of anomaly-detection triggers.
Unicode/URL Encoding: Replacing characters in a command with their hex or Unicode equivalents (e.g., using %2e%2e%2f instead of ../) to bypass simple string filters. 4. Detecting and Avoiding Honeypots
Honeypots are "too good to be true" vulnerabilities. The ethical hacker’s goal is to identify them to avoid wasting time or revealing their presence.
Service Fingerprinting: Honeypots often emulate many services (FTP, Telnet, HTTP) on one IP. If a single host seems to be running an unusually high number of outdated, vulnerable services, it is likely a decoy. Evasion Techniques: IDS To evade IDS systems on
Latency Analysis: Genuine systems have variable response times based on CPU load. Some honeypots have a robotic, consistent response time that can be measured via ping or request analysis.
Interaction Limits: Many honeypots are "low-interaction" and cannot process complex or non-standard commands. Probing for deep system functionality can reveal a lack of a real OS backend. 5. Ethical and Legal Considerations Ethical hacking is defined by authorization.
Rules of Engagement (RoE): Before testing, a document must define what is "off-limits." Scope: Testing must stay within agreed-upon IP ranges.
Data Integrity: The tester must ensure that evasion techniques do not crash production firewalls or disrupt business continuity.
LinkedIn Specifics: Direct testing on LinkedIn’s infrastructure without their explicit "Bug Bounty" or "Vulnerability Disclosure Program" permission is a violation of the law (CFAA in the US) and their terms of service. 6. Conclusion
Evading defensive measures is a cat-and-mouse game. As evasion techniques like fragmentation and encryption evolve, so do defenses like Deep Packet Inspection (DPI) and AI-driven behavior analysis. For the ethical hacker, mastering these techniques is not about causing harm, but about proving that a "locked door" may actually be open.
To help you move forward with this project, would you like me to:
Draft a remediation guide on how to defend against these evasion tactics?
Explain the specific nmap flags used for fragmentation and decoy scanning?
Research LinkedIn’s official Bug Bounty program rules for you?
Ethical Hacking: Evading IDS, Firewalls, and Honeypots LinkedIn Learning
is a highly-rated (4.7/5 stars) intermediate-level program designed to help security professionals test and strengthen network perimeters. Key Course Features Practical Network Simulation
: A major feature is the hands-on instruction for setting up a firewall simulation using , a professional-grade network emulator. Comprehensive Tool Training : You learn to use industry-standard tools like Security Onion for intrusion detection, for port testing, and for running honeypots. CEH Exam Alignment : The curriculum is specifically mapped to the Certified Ethical Hacker (CEH)
body of knowledge, making it a direct study resource for those pursuing the certification. Dual OS Focus
: The course provides an overview of firewall technology for both Windows and Linux
, detailing specific configurations like Windows Firewall and Linux IPTables. Advanced Evasion Techniques
: Beyond basic concepts, it covers specialized techniques such as DNS tunneling , exotic scanning, and deep packet inspection evasion. Interactive Material
: Your learning is supported by exercise files and quizzes to test your retention as you progress through the five major sections. Course Content Overview Key Topics Covered Windows/Linux setup, rule management, and log review. Hardware & Simulation Cisco PIX setup and GNS3 network integration. Perimeter Devices
Web Application Firewalls (WAF), API gateways, and honeypots. Intrusion Protection Intrusion response, Snort rules, and Security Onion. used in the GNS3 simulation or the prerequisites needed before starting this course?
Title: The Silent Art: Evading IDS, Firewalls, and Honeypots on the Modern Battlefield
Subtitle: Why your "loud" hacking tools won’t work against a mature SOC team—and how to adapt.
Let’s be honest. The days of firing up nmap with a default -sS flag and walking into an internal network are over.
Modern defenses are no longer just looking for a signature; they are looking for anomalies. As ethical hackers, our job isn't just to find a vulnerability. It is to prove how a sophisticated adversary operates without being erased from the log stream.
If you want to level up your career from "vulnerability scanner" to "red team operator," you need to master the great trinity of evasion: IDS/IPS, Firewalls, and Honeypots.
Here is how the mindset shifts.
Create a sock puppet account that mirrors a real junior employee at a competitor or partner firm. Use a VPN that exits in the target’s city. Warm up the account for 30 days (connections, posts, likes).
LinkedIn’s GraphQL endpoints are poorly monitored by enterprise NGFWs. An authorized ethical hacker can:
https://www.linkedin.com/voyager/api/identity/profiles.*.linkedin.com.Firewalls are binary. They either allow the port or they don't. Smart pentesters don't fight the firewall; they ride the wave of default allow rules.
What ports are almost never blocked?
www.microsoft.com? Yes. Can it block a POST request to www.microsoft.com that contains a Meterpreter payload stashed in a cookie header? Probably not.Tactic: Use Egress Buster or Metasploit’s reverse port forwarding. If the firewall allows outbound HTTPS (it always does), use tunnel over HTTPS.
Traditional ethical hacking focuses on packets: SYN scans, ICMP echo requests, and HTTP payloads. Firewalls and IDS are adept at catching these. However, LinkedIn traffic rides on TLS 1.3 over port 443. To a firewall, a connection to linkedin.com looks identical to a connection to evil-c2[.]com—provided you use HTTPS.
The Blind Spot: Most EDRs (Endpoint Detection and Response) and NGFWs perform SSL inspection, but they decrypted traffic. However, if an ethical hacker uses LinkedIn as their C2 (Command & Control) channel or OSINT source, they blend into the 90% of corporate traffic that is "professional social networking."
The ultimate ethical hack evades IDS, firewalls, and honeypots by using nothing but native tools and legitimate services.
An IDS looks for anomalies. To evade:
ja3 can fingerprint your TLS handshake. Mimic a standard Chrome or Edge browser exactly.
