Offensive C#
The Offensive C# course by Open Source trains security analysts and penetration testers to exploit vulnerabilities, bypass security measures, and conduct advanced penetration testing using C#. It solves the critical need for professionals who can develop custom offensive tooling to bypass modern endpoint defenses like EDR and AMSI. With cyberattacks increasing by 38% in 2023, organizations urgently demand experts skilled in offensive development to strengthen their defense strategies.
This course prepares learners for the Offensive Development Practitioner Certification (ODPC), a performance-based credential validating real-world evasion and exploit skills. Open Source, a community-driven platform for collaborative security research, provides a unique methodology that emphasizes transparent, peer-reviewed techniques for modern evasion. Open Source provides 30-day lab access, enabling hands-on practice in AWS-hosted environments with live EDR protections. Graduates gain the expertise to design, deploy, and document operational-grade offensive tools, positioning them for advanced red team and offensive security roles.
Training Formats & Pricing
100% Happiness Guarantee · Free Rescheduling · Secure Payment
Course Overview
The Offensive C# course by Open Source is designed for cybersecurity professionals aiming to master offensive techniques in the .NET ecosystem, particularly those preparing for advanced penetration testing roles. While no formal certification exam is directly tied to this course, it serves as critical preparation for elite offensive security credentials such as the OffSec Certified Professional (OSCP) and OSCE³. This training is ideal for penetration testers, exploit developers, and red team operators seeking to deepen their understanding of C#-based attack vectors. With 91% of organizations preferring to hire certified offensive security professionals, skills in offensive .NET development are in high demand across government, finance, and tech sectors.
Participants engage with a range of industry-standard tools and technologies including Visual Studio, .NET 8 SDK, Ysoserial.net, dnSpy, Burp Suite, and Docker-based vulnerable environments like Damn Vulnerable C# Application (API). The hands-on lab environment simulates real-world attack scenarios where students build custom exploit clients, reverse-engineer obfuscated payloads, and develop full-chain attacks targeting deserialization flaws, protocol state abuses, and memory corruption vulnerabilities. A key capstone project involves conducting an adversary simulation on a multi-phase .NET socket server, reproducing real zero-day research conditions to exploit TOCTOU race conditions, request smuggling, and RCE vulnerabilities in a controlled lab setting.
This course significantly enhances career readiness for high-impact roles in offensive security, aligning with industry recognition of exploit development and penetration testing expertise. Certified professionals in these domains command average salaries of $143,000 in the U.S., with senior roles offering even greater compensation. Koenig Solutions strengthens this path with Guaranteed-to-Run scheduling and access to official courseware, ensuring consistent, instructor-led delivery of Open Source’s rigorous curriculum. Graduates emerge equipped to pursue advanced positions in red teaming, vulnerability research, and ethical hacking, ready to defend enterprise systems by thinking and operating like real adversaries.
What You'll Learn
Prerequisites
- Proficiency in C# programming language and experience working with Offensive C# by Open Source
- Understanding of the .NET Framework (minimum version 3.5) as it relates to offensive development
- Familiarity with Windows internals and WinAPI functions essential for offensive security tasks
- Experience with process injection and shellcode execution techniques used in offensive operations
- Knowledge of EDR and antivirus detection mechanisms, along with methods to bypass them
- Hands-on experience with offensive tradecraft tools such as Cobalt Strike to simulate real-world attack scenarios
Certification Exam
Everything you need to know about the Offensive C# certification exam
What's Included in Your Training
Every enrollment comes packed with resources to maximise your learning and exam success
Exam Preparation Materials
Practice Test Questions (200+)
Certificate of Completion
Post-Training Support (30 days)
Session Recording Access
Free Rescheduling (7+ days notice)
Career Outcomes
of Offensive C# certified professionals report career advancement within 6 months
Salary Impact
Average salary increase reported after obtaining the Offensive C# certification
*Source: Glassdoor / LinkedIn 2025
Job Roles
- Red Team Operator
- Offensive Security Consultant
- Penetration Tester
- Malware Developer
- Exploit Developer
- Senior Security Engineer
Companies Hiring
and 5,000+ organizations worldwide seeking Offensive C# certified professionals
Course Student Reviews
Real results from IT professionals who trained with Koenig — rated 4.9/5 from 18,400+ verified reviews.
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★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified -
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified -
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified -
★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified -
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified -
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified
-
★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified -
★★★★★
“Passed AZ-104 on first attempt. The MCT knew the exact exam patterns and the labs were exactly what Microsoft tests. Worth every penny.”
AZ-104 Certified ✓ Verified -
★★★★★
“I trained 15 of my team members for SC-200. Koenig's on-site delivery was seamless and all 15 passed within 3 months.”
Enterprise Client ✓ Verified -
★★★★★
“The 1-on-1 format was a game changer. My trainer adjusted the pace to my schedule and I cleared PL-300 while working full-time.”
PL-300 Certified ✓ Verified
-
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified -
★★★★★
“From AZ-900 to AZ-305 in 6 months. Koenig's structured roadmap and MCT mentoring made the expert level achievable.”
AZ-305 Expert ✓ Verified -
★★★★★
“As an L&D head I've used 5 training vendors. Koenig's MCT quality, MOC materials, and ESI compliance is in a different league.”
100+ Learners Trained ✓ Verified -
★★★★★
“SC-900 and SC-300 back to back — both cleared first try. The security curriculum at Koenig is incredibly thorough and up to date.”
SC-300 Certified ✓ Verified
-
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified -
★★★★★
“AI-102 was daunting but the trainer broke it down perfectly. Real Azure OpenAI labs made the difference. Highly recommend.”
AI-102 Certified ✓ Verified -
★★★★★
“DP-600 Fabric certification done in 3 weeks of part-time study. The customised schedule around my timezone was a lifesaver.”
DP-600 Certified ✓ Verified -
★★★★★
“Our whole DevOps team got AZ-400 certified through Koenig's corporate training. Smooth logistics and top-tier MCTs throughout.”
AZ-400 Team Training ✓ Verified
Frequently Asked Questions
Everything you need to know about the Offensive C# training course
Is the certification exam included in the Offensive Security Exploit Developer (OSED) course, and what is the exam fee if separate?
What training formats does Koenig offer for Offensive Security Exploit Developer (OSED), and is Guaranteed-to-Run scheduling available?
How long is lab access provided, and what type of environment is used for Offensive Security Exploit Developer (OSED) labs?
What is Koenig's rescheduling and cancellation policy for the Offensive Security Exploit Developer (OSED) course?
What is the format, number of questions, passing score, and time limit for the Offensive Security Exploit Developer (OSED) certification exam?
How long is the Offensive Security Exploit Developer (OSED) certification valid, and what is the renewal process and cost?
What post-training support does Koenig provide after completing the Offensive Security Exploit Developer (OSED) course?
What prerequisites or prior experience are recommended for the Offensive Security Exploit Developer (OSED) course?
What career impact and salary potential does the Offensive Security Exploit Developer (OSED) certification offer?
How does Koenig's Offensive Security Exploit Developer (OSED) training compare to self-study options in terms of effectiveness and time efficiency?
Still have questions?
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