├── README.md ├── all_chars.txt ├── allowed_chars.txt └── encoder.py /README.md: -------------------------------------------------------------------------------- 1 | # Alphanumeric Encoder 2 | python encoder [4bytes shellcode] 3 | 4 | ## Useful for Manual Encoding 5 | Egg Hunter 6 | Shellcode 7 | 8 | -------------------------------------------------------------------------------- /all_chars.txt: -------------------------------------------------------------------------------- 1 | \x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13 2 | \x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26 3 | \x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39 4 | \x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c 5 | \x4d\x4e\x4f\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f 6 | \x60\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70\x71\x72 7 | \x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85 8 | \x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98 9 | \x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab 10 | \xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe 11 | \xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1 12 | \xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4 13 | \xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7 14 | \xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff 15 | -------------------------------------------------------------------------------- /allowed_chars.txt: -------------------------------------------------------------------------------- 1 | \x01\x02\x03\x04\x05\x06\x07\x08\x09\x0b\x0c\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\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3b\x3c\x3d\x3e\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 2 | -------------------------------------------------------------------------------- /encoder.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python 2 | 3 | import random 4 | import sys 5 | 6 | with open("allowed_chars.txt") as allowed: 7 | al_chars = allowed.read().rstrip('\n').split("\\x") 8 | 9 | print "Allowed Chars : \r\n" + str(al_chars[1::]) + "\r\n" 10 | al_chars_int = [] 11 | for allowed_int in al_chars[1::]: 12 | x = int(str(allowed_int),16) 13 | al_chars_int.append(x) 14 | 15 | print "Allowed Chars int: \r\n" + str(al_chars_int) + "\r\n" 16 | 17 | target = sys.argv[1] 18 | 19 | ind = target[6:8]+target[4:6]+target[2:4]+target[0:2] 20 | 21 | target = 68719476735 - int(ind,16) + 1 22 | target = hex(target)[3::] 23 | 24 | print target.upper() 25 | 26 | 27 | 28 | target1 = int(target[6:8],16) 29 | target2 = int(target[4:6],16) 30 | target3 = int(target[2:4],16) 31 | target4 = int(target[0:2],16) 32 | 33 | 34 | def generate(target): 35 | total = 0 36 | while total != target: 37 | x1 = random.choice(al_chars_int) 38 | x2 = random.choice(al_chars_int) 39 | x3 = random.choice(al_chars_int) 40 | 41 | total = x1 + x2 + x3 42 | 43 | if total == target: 44 | print "[+] found : "+str(hex(target))+" = " + str(hex(x1))[2::].upper() + " - " + str(hex(x2))[2::].upper() + " - " + str(hex(x3))[2::].upper() 45 | return str(hex(x1))[2::].upper()+" - "+str(hex(x2))[2::].upper()+" - " + str(hex(x3))[2::].upper() 46 | 47 | 48 | 49 | x1 = generate(target1).split(" - ") 50 | x2 = generate(target2).split(" - ") 51 | x3 = generate(target3).split(" - ") 52 | x4 = generate(target4).split(" - ") 53 | 54 | def formathex(x1): 55 | y = [] 56 | for x in x1: 57 | if len(x)==1: 58 | y.append("0"+x) 59 | else: 60 | y.append(x) 61 | return y 62 | 63 | x1 = formathex(x1) 64 | x2 = formathex(x2) 65 | x3 = formathex(x3) 66 | x4 = formathex(x4) 67 | 68 | beg = "\r\nAND EAX,554E4D4A\r\n\ 69 | AND EAX,2A313235\r\n\ 70 | PUSH ESP\r\n\ 71 | POP EAX\r\n\ 72 | SUB EAX,55554D66\r\n\ 73 | SUB EAX,55554B66\r\n\ 74 | SUB EAX,5555506A\r\n\ 75 | PUSH EAX\r\n\ 76 | POP ESP\r\n" 77 | print beg 78 | 79 | 80 | def tostring(x1,x2,x3,x4): 81 | x = x4[0]+x3[0]+x2[0]+x1[0] 82 | y = x4[1]+x3[1]+x2[1]+x1[1] 83 | z = x4[2]+x3[2]+x2[2]+x1[2] 84 | 85 | block = "\r\nBlock : \r\nAND EAX,554E4D4A\r\nAND EAX,2A313235\r\nSUB EAX,"+x+"\r\nSUB EAX,"+y+"\r\n"+"SUB EAX,"+z+"\r\nPUSH EAX" 86 | return block 87 | 88 | print tostring(x1,x2,x3,x4) 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | --------------------------------------------------------------------------------