The Reality of Modern EDR: Why Standard Playbooks are Failing.
The digital landscape is constantly changing, and corporate cyber defences are more robust than ever. For modern organisations, the implementation of advanced Endpoint Detection and Response (EDR) and Antivirus (AV) solutions has significantly raised the barrier to entry for security testing.
For internal red teams and specialised cybersecurity consultants, this presents a major challenge. Relying on standard, open-source offensive tools is no longer sufficient; they are heavily fingerprinted and instantly flagged by modern security stacks. To truly test an enterprise’s resilience, operators must simulate the tactics of highly sophisticated, Advanced Persistent Threats (APTs).
Outflank Security Tooling (OST), developed by the offensive security experts at Outflank (a Fortra company), bridges this gap, allowing teams to bypass the overhead of custom development and focus on what matters: delivering high-value threat emulations.
The Build vs. Buy dilemma in offensive security
Historically, red teams faced a difficult choice when standard public tooling began failing against top-tier EDR solutions:
- The Build Route: Spend weeks or months of highly technical engineering time researching private APIs, writing custom obfuscators, and developing proprietary loaders.
- The Risk Route: Use modified public scripts, risking premature detection, burned infrastructure, and an inaccurate assessment of the client’s actual security posture.
The reality of the “Build” route is that it shifts your most valuable resource, your senior operators away from active testing and into full-time software development. In a mature security model, this overhead is highly inefficient.
OST addresses this directly. It provides a vetted, commercially supported suite of advanced tools engineered explicitly to safely bypass premier defensive controls, giving your team the capabilities of a dedicated R&D department out of the box.
Read more about our Entreprise solutions.
4 Core pillars of evasive threat emulation with OST
Effective offensive testing follows a structured approach across the attack lifecycle. OST enhances each phase by providing deeply integrated tools that work seamlessly alongside industry standards like Cobalt Strike.
1. Initial Access & Evasive Delivery
Delivering a payload into a hardened environment requires bypassing stringent email gateways and endpoint application controls. OST’s Office Intrusion Pack and specialised payload generators allow teams to create highly customised, obfuscated files. By utilising advanced steganography (such as hiding code within seemingly benign images via StegoLoader), operators can bypass standard inspection mechanisms without triggering static analysis alerts.
2. Compilation-Level Obfuscation
Modern EDRs do not just look for specific file signatures; they look for predictable behaviours and memory patterns. Tools within the OST suite, like Sharpfuscator, provide compilation-level C# obfuscation. This ensures that the post-exploitation tools your team relies on are modified fundamentally at the code level before deployment, rendering generic signature-based detection useless.
3. Stealthy Post-Exploitation
Once access is gained, maintaining a stealthy footprint is critical. Traditional remote desktop protocols or noisy lateral movement techniques immediately alert security operations centres (SOCs). OST solves this with unique capabilities like HiddenDesktop. This allows an operator to interact with a target user’s active session completely invisibly, including utilising their active browser sessions and hardware tokens without disrupting the end-user or alerting the defence team.
4. Seamless C2 Integration
OST is not designed to replace your existing command-and-control (C2) infrastructure; it is designed to act as a force multiplier. It integrates natively with Cobalt Strike via custom Beacon Object Files (BOFs). This allows operators to launch highly evasive, low-level system calls directly from inside their existing infrastructure, ensuring maximum operational security (OPSEC) without requiring complex pivoting.
Read our OST Case Study.
Maximising the ROI of your offensive engagements
Mastering threat emulation isn’t about proving you can break into a system using a one-off exploit. It is about providing a realistic, measurable test of an organisation’s detection and response capabilities.
By integrating OST into your offensive security strategy, your organisation can significantly reduce development overhead, maintain absolute OPSEC against premier EDR systems, and deliver the sophisticated simulations required to secure modern enterprises.
Ultimately, a proactive and systematic approach to offensive testing not only validates your current defensive investments but also provides the actionable insights needed to secure your infrastructure against the threats of tomorrow.
Watch OST video demos.
Next Steps
Ready to elevate your red teaming capabilities and move past the limitations of open-source tools? Book a Consultation with S4 Applications today to learn more about accessing the Fortra Offensive Security ecosystem.