mewbak / amber

Reflective PE packer.

Inroduction

Amber is a position-independent(reflective) PE loader that enables in-memory execution of native PE files(EXE, DLL, SYS...). It enables stealthy in-memory payload deployment that can be used to bypass anti-virus, firewall, IDS, IPS products, and application white-listing mitigations. Reflective payloads generated by Amber can either be staged from a remote server or executed directly in memory much like a generic shellcode. By default, every generated payload is encoded using the new generation SGN encoder. Amber uses CRC32_API and IAT_API for inconspicuously resolving the Windows API function addresses. After the PE file is loaded and executed in memory, the reflective payload is erased for evading memory scanners.

Developed By Ege Balcı @PRODAFT.

Installation

Pre-compiled binaries can be found under releases.

Building From Source

The only dependency for building the source is the keystone engine, follow these instructions for installing the library. Once libkeystone is installed on the system, simply just go get it ツ

go get github.com/EgeBalci/amber

Docker Install

docker pull egee/amber
docker run -it egee/amber

Usage

The following table lists switches supported by the amber.

Switch	Type	Description
-build	bool	Build EXE stub that executes the generated reflective payload
-e	int	Number of times to encode the generated reflective payload
-f	string	Input PE file.
-iat	bool	Use IAT API resolver block instead of CRC API resolver block
-ignore-checks	bool	Ignore integrity check errors.
-max	int	Maximum number of bytes for obfuscation (default 5)
-stub	string	Use custom stub file for executing the generated reflective payload (currently very unstable)

Example Usage

• Generate reflective payload.

amber -f test.exe

• Generate reflective payload and build EXE stub for executing it.

amber -build -f test.exe

Docker Usage

docker run -it -v /tmp/:/tmp/ amber -f /tmp/file.exe

Demo

• NOPcon 2018 DEMO
• Pentest.blog - Deploying Reflective PE Files With Metasploit
• Pentest.blog - Deploying Reflective Ransomware POC