Documentation Index
Fetch the complete documentation index at: https://mintlify.com/JoasASantos/SysWhispers4/llms.txt
Use this file to discover all available pages before exploring further.
What is SSN Resolution?
System Service Numbers (SSNs) are the numeric identifiers that Windows uses to route syscalls to the correct kernel function. Each NT function has a unique SSN that can vary across Windows versions. When your code executes a syscall, the SSN must be placed in theeax register (or w8 on ARM64) before the syscall instruction:
SSNs change between Windows versions.
NtAllocateVirtualMemory is 0x18 on Windows 10 21H2, but 0x16 on Windows 7 SP1.Why Multiple Resolution Methods?
AV/EDR products place inline hooks on NT functions inntdll.dll to monitor syscalls. Different resolution techniques vary in their ability to extract SSNs from hooked environments:
- Static methods embed SSN tables at generation time — fast but detectable
- Dynamic methods extract SSNs from ntdll at runtime — resistant to hooks but slower
- Advanced methods use techniques like hardware breakpoints or clean disk copies — maximum evasion
Available Methods
SysWhispers4 provides 8 different SSN resolution strategies, each with different tradeoffs:Static
Embedded j00ru table. Fastest, no runtime parsing. Low stealth.
Hell's Gate
Read SSN from opcode bytes. Fast but fails when hooked.
Halo's Gate
Neighbor scan (±8 stubs) when target is hooked.
Tartarus' Gate
Detects E9/FF25/EB/CC hooks. Scans ±16 neighbors.
FreshyCalls
Sort by VA — doesn’t read function bytes. Default method.
SyscallsFromDisk
Maps clean ntdll from
\KnownDlls\. Bypasses ALL hooks.RecycledGate
FreshyCalls + opcode validation. Most resilient.
HW Breakpoint
Debug registers + VEH. Captures SSN at execution.
Quick Comparison
| Method | Hook Resistance | Speed | Stealth | Use Case |
|---|---|---|---|---|
| Static | None | Fastest | Low | Quick testing, CTF |
| Hell’s Gate | Low | Fast | Medium | Lightly-hooked environments |
| Halo’s Gate | Medium | Fast | Medium | Moderate EDR presence |
| Tartarus’ Gate | High | Fast | High | Heavily-hooked EDR |
| FreshyCalls | Very High | Medium | High | Recommended default |
| SyscallsFromDisk | Maximum | Slow | Very High | Maximum evasion |
| RecycledGate | Maximum | Medium | Very High | Production red team ops |
| HW Breakpoint | Maximum | Slow | Very High | Advanced analysis evasion |
Choosing the Right Method
For Quick Testing / CTF
For Standard Red Team Operations
For Heavily-Hooked Environments
For Maximum Evasion
Runtime Initialization
Dynamic resolution methods require callingSW4_Initialize() at startup:
Learn More
Detailed Method Reference
Complete documentation for all 8 resolution methods with usage examples.
FreshyCalls Deep Dive
In-depth explanation of the sort-by-VA technique and why it works.
RecycledGate Analysis
How RecycledGate combines multiple techniques for maximum reliability.
Hardware Breakpoint Method
Advanced VEH-based SSN extraction using debug registers.
