LightsOut: Generate an obfuscated DLL that will disable AMSI & ETW

by do son · June 3, 2023

LightsOut

LightsOut will generate an obfuscated DLL that will disable AMSI & ETW while trying to evade AV. This is done by randomizing all WinAPI functions used, xor encoding strings, and utilizing basic sandbox checks. Mingw-w64 is used to compile the obfuscated C code into a DLL that can be loaded into any process where AMSI or ETW are present (i.e. PowerShell).

LightsOut is designed to work on Linux systems with python3 and mingw-w64 installed. No other dependencies are required.

Features currently include:

XOR encoding for strings
WinAPI function name randomization
Multiple sandbox check options
Hardware breakpoint bypass option

Download

git clone https://github.com/icyguider/LightsOut.git

Use

 _______________________

|                       |

|   AMSI + ETW          |

|                       |

|        LIGHTS OUT     |

|        _______        |

|       ||     ||       |

|       ||_____||       |

|       |/    /||       |

|       /    / ||       |

|      /____/ /-'       |

|      |____|/          |

|                       |

|          @icyguider   |

|                       |

|                     RG|

`-----------------------'

usage: lightsout.py [-h] [-m <method>] [-s <option>] [-sa <value>] [-k <key>] [-o <outfile>]



Generate an obfuscated DLL that will disable AMSI & ETW



options:

  -h, --help            show this help message and exit

  -m <method>, --method <method>

                        Bypass technique (Options: patch, hwbp) (Default: patch)

  -s <option>, --sandbox <option>

                        Sandbox evasion technique (Options: mathsleep, username, hostname, domain) (Default: mathsleep)

  -sa <value>, --sandbox-arg <value>

                        Argument for sandbox evasion technique (Ex: WIN10CO-DESKTOP, testlab.local)

  -k <key>, --key <key>

                        Key to encode strings with (randomly generated by default)

  -o <outfile>, --outfile <outfile>

                        File to save DLL to

Intended Use/Opsec Considerations

This tool was designed to be used on pentests, primarily to execute malicious powershell scripts without getting blocked by AV/EDR. Because of this, the tool is very barebones and a lot can be added to improve opsec. Do not expect this tool to completely evade detection by EDR.

Usage Examples

You can transfer the output DLL to your target system and load it into powershell in various ways. For example, it can be done via P/Invoke with LoadLibrary: