Bashfuscator – The Art of Concealing Bash Scripts

Documentation

What Is Bashfuscator?

Bashfuscator is a modular and extendable Bash obfuscation framework written in Python 3. It provides numerous different ways of making Bash one-liners or scripts much more difficult to understand.

It accomplishes this by generating convoluted, randomized Bash code that at runtime evaluates to the original input and executes it.

Bashfuscator makes generating highly obfuscated Bash commands and scripts easy, both from the command line and as a Python library.

The purpose of this project is to give Red Team the ability to bypass static detections on a Linux system, and the knowledge and tools to write better Bash obfuscation techniques.

This framework was also developed with Blue Team in mind. With this framework, Blue Team can easily generate thousands of unique obfuscated scripts or commands to help create and test detections of Bash obfuscation.

Media/Slides

This is a list of all the media (i.e. youtube videos) or links to slides about Bashfuscator.

• Bsides Charm

Payload Support

Though Bashfuscator does work on UNIX systems, many of the payloads it generates will not. This is because most UNIX systems use BSD style utilities, and Bashfuscator was built to work with GNU style utilities.

In the future BSD payload support may be added, but for now payloads generated with Bashfuscator should work on GNU Linux systems with Bash 4.0 or newer.

Installation And Requirements

Bashfuscator requires Python 3.6+.

On a Debian-based distro, run this command to install dependencies:

sudo apt-get update && sudo apt-get install python3 python3-pip python3-argcomplete xclip

On a RHEL-based distro, run this command to install dependencies:

sudo dnf update && sudo dnf install python3 python3-pip python3-argcomplete xclip

Then, run these commands to clone and install Bashfuscator:

git clone https://github.com/Bashfuscator/Bashfuscator
cd Bashfuscator
python3 setup.py install --user

Only Debian and RHEL based distros are supported. Bashfuscator has been tested working on some UNIX systems, but is not supported on those systems.

Example Usage

For simple usage, just pass the command you want to obfuscate with -c, or the script you want to obfuscate with -f.

$ bashfuscator -c "cat /etc/passwd"
[+] Mutators used: Token/ForCode -> Command/Reverse
[+] Payload:

   ${@/l+Jau/+<b=k } p''"r"i""n$'t\u0066'  %s  "$(      ${*%%Frf\[4?T2   }  ${*##0\!j.G }   "r"'e'v <<< '   "} ~@{$"   ")  }  j@C`\7=-k#*{$   "}   ,@{$"  ; }  ;   } ,,*{$  "}]  }   ,*{$  "}   f9deh`\>6/J-F{\,vy//@{$" niOrw$   } QhwV#@{$ [NMpHySZ{$"  s%  "f"'"'"'4700u\n9600u\r'"'"'$p  {   ;  }  ~*{$  "}  48T`\PJc}\#@{$"   1#31  "}  ,@{$"   }  D$y?U%%*{$ 0#84  *$   }   Lv:sjb/@{$   2#05   }   ~@{$   2#4   }*!{$  }   OGdx7=um/X@RA{\eA/*{$ 1001#2   }   Scnw:i/@{$  } ~~*{$  11#4   "} O#uG{\HB%@{$"   11#7 "} ^^@{$"  011#2   "}   ~~@{$" 11#3 }  L[\h3m/@{$  "}   ~@{$" 11#2 }  6u1N.b!\b%%*{$   }   YCMI##@{$   31#5 "} ,@{$" 01#7  }  (\}\;]\//*{$ }   %#6j/?pg%m/*{$   001#2  "}  6IW]\p*n%@{$"   }  ^^@{$ 21#7  } !\=jy#@{$  }   tz}\k{\v1/?o:Sn@V/*{$  11#5   ni   niOrw  rof ;   "}   ,,@{$"  } MD`\!\]\P%%*{$   )  }@{$   a   }  ogt=y%*{$ "@$" /\   }   {\nZ2^##*{$    \   *$  c  }@{$  }   h;|Yeen{\/.8oAl-RY//@{$   p  *$  "}@{$"  t   }  zB(\R//*{$  } mX=XAFz_/9QKu//*{$  e   *$  s  } ~~*{$  d   }  ,*{$   }  2tgh%X-/L=a_r#f{\//*{$   w }  {\L8h=@*##@{$   "}   W9Zw##@{$"  (=NMpHySZ    ($"  la'"'"''"'"'"v"'"'"''"'"''"'"'541\'"'"'$  } &;@0#*{$ '   "${@}" "${@%%Ij\[N   }"    ${@~~  }   )"  ${!*} |   $@  $'b\u0061'''sh   ${*//J7\{=.QH   }  

[+] Payload size: 1232 characters

You can copy the obfuscated payload to your clipboard with --clip, or write it to a file with -o.

For more advanced usage, use the --choose-mutators flag, and specify exactly what obfuscation modules, or Mutators, you want to use in what order. Use also the -s argument to control the level of obfuscation used.

bashfuscator -c "cat /etc/passwd" --choose-mutators token/special_char_only compress/bzip2 string/file_glob -s 1
[+] Payload:

"${@#b }"  "e"$'\166'"a""${@}"l "$(  ${!@}m''$'k\144'''ir -p '/tmp/wW'${*~~} ;$'\x70'"${@/AZ }"rin""tf  %s  'MxJDa0zkXG4CsclDKLmg9KW6vgcLDaMiJNkavKPNMxU0SJqlJfz5uqG4rOSimWr2A7L5pyqLPp5kGQZRdUE3xZNxAD4EN7HHDb44XmRpN2rHjdwxjotov9teuE8dAGxUAL'>  '/tmp/wW/?
??';  prin${@#K. }tf %s  'wYg0iUjRoaGhoNMgYgAJNKSp+lMGkx6pgCGRhDDRGMNDTQA0ABoAAZDQIkhCkyPNIm1DTQeppjRDTTQ8D9oqA/1A9DjGhOu1W7/t4J4Tt4fE5+isX29eKzeMb8pJsPya93'  >  '/tmp/wW/???
' "${@,, }"  &&${*}pri''\n${*,}tf %s 'RELKWCoKqqFP5VElVS5qmdRJQelAziQTBBM99bliyhIQN8VyrjiIrkd2LFQIrwLY2E9ZmiSYqay6JNmzeWAklyhFuph1mXQry8maqHmtSAKnNr17wQlIXl/ioKq4hMlx76' >'/tmp/wW/??

';"${@,  }" $'\x70'rintf  %s 'clDkczJBNsB1gAOsW2tAFoIhpWtL3K/n68vYs4Pt+tD6+2X4FILnaFw4xaWlbbaJBKjbGLouOj30tcP4cQ6vVTp0H697aeleLe4ebnG95jynuNZvbd1qiTBDwAPVLTtCLx' >'/tmp/wW/?

?' ;  ${*/~} p""${@##vl  }ri""n''tf %s  '  pr'"'"'i'"'"'$'"'"'n\x74'"'"'f %s  "$( prin${*//N/H  }tf  '"'"'QlpoOTFBWSZTWVyUng4AA3R/gH7z/+Bd/4AfwAAAD8AAAA9QA/7rm7NzircbE1wlCTBEamT1PKekxqYIA9TNQ' >'/tmp/wW/????'  "${@%\`  }"  ;p''r""i$'\x6e'''$'\164'"f" %s 'puxuZjSK09iokSwsERuYmYxzhEOARc1UjcKZy3zsiCqG5AdYHeQACRPKqVPIqkxaQnt/RMmoLKqCiypS0FLaFtirJFqQtbJLUVFoB/qUmEWVKxVFBYjHZcIAYlVRbkgWjh'  >'/tmp/wW/?


'  ${*};"p"rin''$'\x74f' %s  'Gs02t3sw+yFjnPjcXLJSI5XTnNzNMjJnSm0ChZQfSiFbxj6xzTfngZC4YbPvaCS3jMXvYinGLUWVfmuXtJXX3dpu379mvDn917Pg7PaoCJm2877OGzLn0y3FtndddpDohg'>'/tmp/wW/?
?
' && "${@^^ }"  pr""intf  %s  'Q+kXS+VgQ9OklAYb+q+GYQQzi4xQDlAGRJBCQbaTSi1cpkRmZlhSkDjcknJUADEBeXJAIFIyESJmDEwQExXjV4+vkDaHY/iGnNFBTYfo7kDJIucUES5mATqrAJ/KIyv1UV'> '/tmp/wW/
???'  ${*^}; ${!@}  "${@%%I  }"pri""n$'\x74f' %s '1w6xQDwURXSpvdUvYXckU4UJBclJ4OA'"'"'  |""b${*/t/\(  }a\se$'"'"'6\x34'"'"' -d| bu${*/\]%}nzi'"'"'p'"'"'${!@}2  -c)"  $@  |${@//Y^  } \ba\s"h"  ' >  '/tmp/wW/
??
' ${@%b  } ;  pr"i"\ntf  %s  'g8oZ91rJxesUWCIaWikkYQDim3Zw341vrli0kuGMuiZ2Q5IkkgyAAJFzgqiRWXergULhLMNTjchAQSXpRWQUgklCEQLxOyAMq71cGgKMzrWWKlrlllq1SXFNRqsRBZsKUE' >  '/tmp/wW/??
?'"${@//Y  }" ;$'c\141t' '/tmp/wW'/????  ${*/m};"${@,,  }"  $'\162'\m '/tmp/wW'/????  &&${@^ }rmd\ir  '/tmp/wW'; ${@^^  }   )"  "${@}"  

[+] Payload size: 2062 characters

For more detailed usage and examples, please refer to the documentation.

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