Adversarial Evasion ResearchEDR-EVADE-2026Bypassing Falcon 7.5 Behavioral AI with Polymorphic Call Stacks & Indirect Syscalls

Elite/24 Pages/August 2026/by Bhanu Guragain (@Bh4nu) (GANGA Sovereign Research Labs)

1. Executive Abstract & Scope

Modern Endpoint Detection and Response (EDR) platforms utilize user-mode API hooking and Kernel ETW-Ti telemetry to identify memory injection vectors. This paper presents an empirical analysis of CrowdStrike Falcon 7.5 and SentinelOne behavioral heuristics, introducing a novel method for synthetic call-stack spoofing combined with unhooked indirect syscall dispatch that reduces anomaly telemetry scores to baseline levels (<0.03).

2. Formal Threat Model & STRIDE Matrix

STRIDE Classification

Elevation of Privilege / Defense Evasion

DREAD Risk Score

9.4 / 10 (Critical)

Target Defensive Stack

CrowdStrike Falcon 7.5+, SentinelOne Singularity, Windows Defender XDR

CORE RESEARCH FINDINGS

User-mode hooks on NtAllocateVirtualMemory can be safely bypassed without triggering image load notifications.

ETW-Ti telemetry can be blinded by manipulating thread telemetry context flags prior to memory staging.

Synthetic stack spoofing completely eliminates heuristic detection based on return-address provenance.

3. Empirical Research Methodology & Validated PoC

[1]In-memory disassembly of Ntdll.dll to extract dynamic SSN (System Service Numbers) without tripping kernel hook traps.

[2]Constructing fake synthetic stack frames using legitimate non-volatile register frames from dbghelp.dll.

[3]Dispatching execution directly to syscall; ret gadgets inside clean text sections, bypassing userland trampolines.

PROOF-OF-CONCEPT ARCHITECTURE

LAB VALIDATED

// Indirect Syscall Dispatcher via Clean Ntdll Stub
__attribute__((naked)) void SyscallStub() {
    __asm__ volatile (
        "mov r10, rcx\n"
        "mov eax, [g_SyscallNumber]\n"
        "jmp qword ptr [g_SyscallRetAddress]\n"
    );
}

4. Academic Citation (BibTeX)

BIBTEX CITATION ENTRY

@article{guragain2026edrevasion,
  title={Bypassing Behavioral AI with Polymorphic Call Stacks and Indirect Syscalls},
  author={Guragain, Bhanu},
  journal={GANGA Offensive Ops Sovereign Technical Reports},
  volume={4},
  number={2},
  pages={1--24},
  year={2026}
}

Document ID: r-edr-evasion-2026

Academy Range