Psobf – PowerShell Obfuscator

Tool for obfuscating PowerShell scripts written in Go. The main objective of this program is to obfuscate PowerShell code to make its analysis and detection more difficult. The script offers 5 levels of obfuscation, from basic obfuscation to script fragmentation. This allows users to tailor the obfuscation level to their specific needs.

./psobf -h
██████╗ ███████╗ ██████╗ ██████╗ ███████╗
██╔══██╗██╔════╝██╔═══██╗██╔══██╗██╔════╝
██████╔╝███████╗██║   ██║██████╔╝█████╗
██╔═══╝ ╚════██║██║   ██║██╔══██╗██╔══╝
██║     ███████║╚██████╔╝██████╔╝██║
╚═╝     ╚══════╝ ╚═════╝ ╚═════╝ ╚═╝
@TaurusOmar
v.1.0                                               
Usage: ./obfuscator -i <inputFile> -o <outputFile> -level <1|2|3|4|5>
Options:
-i string
Name of the PowerShell script file.
-level int
Obfuscation level (1 to 5). (default 1)
-o string
Name of the output file for the obfuscated script. (default "obfuscated.ps1")
Obfuscation levels:
1: Basic obfuscation by splitting the script into individual characters.
2: Base64 encoding of the script.
3: Alternative Base64 encoding with a different PowerShell decoding method.
4: Compression and Base64 encoding of the script will be decoded and decompressed at runtime.
5: Fragmentation of the script into multiple parts and reconstruction at runtime.

Features:

• Obfuscation Levels: Four levels of obfuscation, each more complex than the previous one.
  • Level 1 obfuscation by splitting the script into individual characters.
  • Level 2 Base64 encoding of the script.
  • Level 3 Alternative Base64 encoding with a different PowerShell decoding method.
  • Level 4 Compression and Base64 encoding of the script will be decoded and decompressed at runtime.
  • Level 5 Fragmentation of the script into multiple parts and reconstruction at runtime.
• Compression and Encoding: Level 4 includes script compression before encoding it in base64.
• Variable Obfuscation: A function was added to obfuscate the names of variables in the PowerShell script.
• Random String Generation: Random strings are generated for variable name obfuscation.

Install

go install github.com/TaurusOmar/psobf@latest

Example of Obfuscation Levels

The obfuscation levels are divided into 5 options. First, you need to have a PowerShell file that you want to obfuscate. Let’s assume you have a file named script.ps1 with the following content:

Write-Host "Hello, World!"

Level 1: Basic Obfuscation

Run the script with level 1 obfuscation.

./obfuscator -i script.ps1 -o obfuscated_level1.ps1 -level 1

This will generate a file named obfuscated_level1.ps1 with the obfuscated content. The result will be a version of your script where each character is separated by commas and combined at runtime.
Result (level 1)

$obfuscated = $([char[]]("`W`,`r`,`i`,`t`,`e`,`-`,`H`,`o`,`s`,`t`,` `,`"`,`H`,`e`,`l`,`l`,`o`,`,` `,`W`,`o`,`r`,`l`,`d`,`!`,`"`") -join ''); Invoke-Expression $obfuscated

Level 2: Base64 Encoding

Run the script with level 2 obfuscation:

./obfuscator -i script.ps1 -o obfuscated_level2.ps1 -level 2

This will generate a file named obfuscated_level2.ps1 with the content encoded in base64. When executing this script, it will be decoded and run at runtime.
Result (level 2)

$obfuscated = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('V3JpdGUtSG9zdCAiSGVsbG8sIFdvcmxkISI=')); Invoke-Expression $obfuscated

Level 3: Alternative Base64 Encoding

Execute the script with level 3 obfuscation:

./obfuscator -i script.ps1 -o obfuscated_level3.ps1 -level 3

This level uses a slightly different form of base64 encoding and decoding in PowerShell, adding an additional layer of obfuscation.
Result (level 3)

$e = [System.Convert]::FromBase64String('V3JpdGUtSG9zdCAiSGVsbG8sIFdvcmxkISI='); $obfuscated = [System.Text.Encoding]::UTF8.GetString($e); Invoke-Expression $obfuscated

Level 4: Compression and Base64 Encoding

Execute the script with level 4 obfuscation:

./obfuscator -i script.ps1 -o obfuscated_level4.ps1 -level 4

This level compresses the script before encoding it in base64, making analysis more complicated. The result will be decoded and decompressed at runtime.
Result (level 4)

$compressed = 'H4sIAAAAAAAAC+NIzcnJVyjPL8pJUQQAlRmFGwwAAAA='; $bytes = [System.Convert]::FromBase64String($compressed); $stream = New-Object IO.MemoryStream(, $bytes); $decompressed = New-Object IO.Compression.GzipStream($stream, [IO.Compression.CompressionMode]::Decompress); $reader = New-Object IO.StreamReader($decompressed); $obfuscated = $reader.ReadToEnd(); Invoke-Expression $obfuscated

Level 5: Script Fragmentation

Run the script with level 5 obfuscation:

./obfuscator -i script.ps1 -o obfuscated_level5.ps1 -level 5

This level fragments the script into multiple parts and reconstructs it at runtime.
Result (level 5)

$fragments = @(
'Write-', 
'Output "', 
'Hello,', 
' Wo', 
'rld!', 
'"'
); 
$script = $fragments -join ''; 
Invoke-Expression $script

This program is provided for educational and research purposes. It should not be used for malicious activities.