slae32 crypters
1.0.0
ID de estudiante: SLAE-1530
Este shellcode crypter está utilizando el cifrado RC4 para cifrar y descifrar la carga útil directamente en la memoria.
La tecla RC4 no es conocida tanto por CRYPTER como por Stub, se forzará al bruto en el tiempo de ejecución de Stub CRC32(Random(Length=4)) . Siéntase libre de aumentar la longitud de la clave aleatoria, observe que podría aumentar considerablemente el tiempo antes de que el código de shell sea descifrado.
Cuando la carga útil se descifra en tiempo de ejecución, el stub creará una nueva región de memoria ejecutable y copiará el shellcode descifrado a esa región antes de la ejecución.
Significa que no requiere que la pila sea ejecutable.
La carga útil se almacena en el EOF del trozo generado.
Para compilar tanto Stub como CRYPTER, necesitará instalar Lázarus IDE en su máquina Linux.
En Ubuntu / Debian puede usar el siguiente comando:
Local@user: $ sudo apt install lazarus
Local@user: $ Crypter/dist/crypter <shellcode> <outputfile>
Local@user: $ Crypter/dist/crypter "x31xc0x50x68x62x61x73x68x68x69x6ex2fx2fx68x2fx2fx2fx62x89xe3x66xb8x2dx63x50x31xc0x89xe2x50x68x73x73x77x64x68x63x2fx70x61x68x20x2fx65x74x68x2fx63x61x74x68x2fx62x69x6ex89xe6x50x56x52x53x89xe1x50x89xe2xb0x0bxcdx80" /tmp/encrypted_payload
local@user: $ /tmp/encrypted_payload
Build.pyEl script Build.py está diseñado para compilar tanto Stub como Crypter , pero no solo.
Cuando se genera una nueva versión de programa Stub , el script incrustará el trozo sin procesar directamente dentro del crypter .
Esto se requiere ya que el programa CRYPTER es completamente independiente, el trozo está integrado en el interior.
Local@user: $ cd Crypter && python3 build.py
phrozen@ubuntu:~/SLAE32/SLAE-Exam/Level7/git/slae32-crypters$ cd Crypter && python3 build.py
[*] Compile stub project...
Hint: (11030) Start of reading config file /etc/fpc.cfg
Hint: (11031) End of reading config file /etc/fpc.cfg
Free Pascal Compiler version 3.0.4+dfsg-18ubuntu2 [2018/08/29] for i386
Copyright (c) 1993-2017 by Florian Klaempfl and others
(1002) Target OS: Linux for i386
(3104) Compiling stub.dpr
(3104) Compiling ../shared/unteof.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/unteof.pas(92,47) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
(3104) Compiling ../shared/untrc4.pas
(3104) Compiling ../shared/untcrc32.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untcrc32.pas(113,43) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untcrc32.pas(113,61) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untcrc32.pas(113,37) Warning: (4056) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untrc4.pas(244,13) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untrc4.pas(244,31) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untrc4.pas(244,7) Warning: (4056) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untrc4.pas(244,56) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untrc4.pas(244,74) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untrc4.pas(244,50) Warning: (4056) Conversion between ordinals and pointers is not portable
(3104) Compiling ../shared/untfunctions.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untfunctions.pas(30,37) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untfunctions.pas(30,55) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/../shared/untfunctions.pas(30,31) Warning: (4056) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/stub.dpr(43,30) Hint: (4079) Converting the operands to "Int64" before doing the add could prevent overflow errors.
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/stub/stub.dpr(31,5) Note: (5025) Local variable "n" not used
(9015) Linking stub
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
(1008) 836 lines compiled, 0.2 sec
(1021) 4 warning(s) issued
(1022) 12 hint(s) issued
(1023) 1 note(s) issued
[+] Stub project successfully built.
[*] Patch stub file on crypter project...
[*] Finding tags locations
[+] Tags found. tag_begin=433, tag_end=6263778
[*] Generate stub array...
[*] Patch stub source file...
[+] Stub source file successfully patched.
[*] Compile crypter project...
Hint: (11030) Start of reading config file /etc/fpc.cfg
Hint: (11031) End of reading config file /etc/fpc.cfg
Free Pascal Compiler version 3.0.4+dfsg-18ubuntu2 [2018/08/29] for i386
Copyright (c) 1993-2017 by Florian Klaempfl and others
(1002) Target OS: Linux for i386
(3104) Compiling crypter.dpr
(3104) Compiling /home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas
(3104) Compiling /home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untcrc32.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untcrc32.pas(113,43) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untcrc32.pas(113,61) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untcrc32.pas(113,37) Warning: (4056) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas(244,13) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas(244,31) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas(244,7) Warning: (4056) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas(244,56) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas(244,74) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untrc4.pas(244,50) Warning: (4056) Conversion between ordinals and pointers is not portable
(3104) Compiling /home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untfunctions.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untfunctions.pas(30,37) Hint: (4055) Conversion between ordinals and pointers is not portable
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untfunctions.pas(30,55) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/untfunctions.pas(30,31) Warning: (4056) Conversion between ordinals and pointers is not portable
(3104) Compiling /home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/unttypes.pas
(3104) Compiling /home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/unteof.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/shared/unteof.pas(92,47) Hint: (4035) Mixing signed expressions and longwords gives a 64bit result
(3104) Compiling untlocalfunctions.pas
(3104) Compiling untstub.pas
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/crypter/crypter.dpr(33,61) Hint: (5092) Variable "AShellcode" of a managed type does not seem to be initialized
/home/phrozen/SLAE32/SLAE-Exam/Level7/git/slae32-crypters/Crypter/crypter/crypter.dpr(49,75) Hint: (5058) Variable "ASignature" does not seem to be initialized
(9015) Linking crypter
/usr/bin/ld.bfd: warning: link.res contains output sections; did you forget -T?
(1008) 78238 lines compiled, 0.8 sec
(1021) 4 warning(s) issued
(1022) 13 hint(s) issued
[+] Crypter project successfully built.
[*] copy crypter to "dist" directory...
[*] doing some cleanup...
[+] Crypter successfully compiled and is ready for use!
[*] Have fun :-)
