├── LICENSE
├── README.md
└── b64mute.py


/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2021 【☆ ゆう ☆ 】
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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 1 | # b64mute - Base64 Mutator
 2 | 
 3 | This program applies simple mutations to base64 encoded strings for obfuscation purposes. It applies an uneven chunk approach to concatenate arbitrary chunks with padding.
 4 | 
 5 | For more info read [this writeup](https://n0.lol/encmute/)!
 6 | 
 7 | ## Usage ##
 8 | 
 9 | Generate a mutation from a string
10 | 
11 |     $ python3 b64mute.py -d "netspooky"
12 |     bmU=dHNwb28=a3k=
13 | 
14 | Generate a mutation on a file:
15 | 
16 |     $ python3 b64mute.py -f test.txt
17 |     aA==dHQ=cHM6Ly90d2k=dHRlcg==Lg==Y28=bS8=bg==ZQ==dA==c3Bvb2t5
18 | 
19 | Save the output to a file:
20 | 
21 |     $ python3 b64mute.py -d "admin:hunter2" -o out.txt
22 | 
23 | Test your string:
24 | 
25 |     $ base64 -d <<< "bmU=dHNwb28=a3k="
26 |     netspooky
27 | 
28 | 


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/b64mute.py:
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 1 | import base64
 2 | import argparse
 3 | from random import randrange
 4 | 
 5 | parser = argparse.ArgumentParser(description='Base64 Mutator')
 6 | parser.add_argument('-d', dest='indata', help='Input data (string)')
 7 | parser.add_argument('-f', dest='infile', help='Input file')
 8 | parser.add_argument('-o', dest='outfile', help='Output file')
 9 | 
10 | def doEncode(mBytes):
11 |     b64Bytes = base64.b64encode(mBytes)
12 |     return b64Bytes
13 | 
14 | def openFile(filename):
15 |     with open(filename, "rb") as f:
16 |         fileobj = f.read()
17 |     return fileobj
18 | 
19 | if __name__ == '__main__':
20 |     args    = parser.parse_args()
21 |     indata  = args.indata
22 |     infile  = args.infile
23 |     outfile = args.outfile
24 | 
25 |     outmsg = b'' # This will hold the base64 object
26 | 
27 |     if indata:
28 |         data2enc = indata
29 |         data2enc_bytes = data2enc.encode('utf-8') # Convert to bytes object
30 |     elif infile:
31 |         data2enc = openFile(infile)
32 |         data2enc_bytes = data2enc # It's already a bytes object here
33 | 
34 |     msgLen = len(data2enc_bytes)
35 |     x = 0
36 |     while x < msgLen:
37 |         chunkSize = randrange(1,4)
38 |         outmsg += doEncode(data2enc_bytes[x:x+chunkSize])
39 |         x = x + chunkSize
40 |     if outfile: # We write to file 
41 |         f = open(outfile, 'wb')
42 |         f.write(outmsg)
43 |         f.close()
44 |     else: # Otherwise write to stdout
45 |         b64Enc = outmsg.decode('utf-8')
46 |         print("{}".format(b64Enc))
47 | 
48 | 


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