aeondave/shellcode-fluctuation
offensive-tools/evasion/shellcode-fluctuation/SKILL.md
C++ shellcode fluctuation technique that encrypts injected shellcode between C2 sleep intervals to evade EDR memory scans. Use when implants are being detected by memory-scanning EDR products during sleep.
$ install --global
skillsauthnpx skillsauth add aeondave/malskill shellcode-fluctuationInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Mar 31, 2026, 9:10 PM59.3s1 file scanned
SKILL.md
- name:
- shellcode-fluctuation
- description:
- C++ shellcode fluctuation technique that encrypts injected shellcode between C2 sleep intervals to evade EDR memory scans. Use when implants are being detected by memory-scanning EDR products during sleep.
- license:
- MIT
- compatibility:
- C++; Windows x64; MSVC or MinGW; github.com/mgeeky/ShellcodeFluctuation
- author:
- AeonDave
- version:
- 1.0
Shellcode Fluctuation
C++ in-memory evasion — XOR-encrypts shellcode in RX pages during C2 sleep to defeat memory scanners.
Quick Start
# Clone and build with MSVC
git clone https://github.com/mgeeky/ShellcodeFluctuation
# Open in Visual Studio, build Release x64
# Or MinGW
x86_64-w64-mingw32-g++ -O2 -o fluctuator.exe main.cpp -lntdll
Core Mechanism
[Shellcode in memory]
Awake: → Decrypt → Execute → Sleep
Asleep: → Encrypt (XOR) → change PROT to RW → Scanner sees garbage
Wake: → change PROT to RX → Decrypt → Resume
Configuration (main.cpp)
#define SHELLCODE_FLUCTUATE true
#define XOR_KEY 0xdeadbeef
#define SLEEP_INTERVAL_MS 5000
Common Workflows
Integrate into Cobalt Strike BOF loader:
- Generate raw shellcode from CS listener
- Embed in fluctuator loader source
- Call
FluctuateShellcode()wrapper before Sleep()
Combine with indirect syscalls:
// Replace VirtualProtect with direct NtProtectVirtualMemory
// via syscall stub to avoid API hooks
Resources
| File | When to load |
|------|--------------|
| references/ | Hook evasion and memory protection patterns |
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