![]() ![]() The first known variant of ChaChi was used in attacks on the networks of local government authorities in France, and was listed as an indicator of compromise (IoC) in a publication by CERT France at the time of the attacks. This can make Go a more challenging language to analyze.ĬhaChi has been observed in the wild since at least the first half of 2020 without receiving much attention from the cybersecurity industry. As this is such a new phenomenon, many core tools to the analysis process are still catching up. This Trojan has been used by operators of the PYSA (aka Mespinoza) ransomware as part of their toolset to attack victims globally, but most recently targeting education organizations.ĬhaChi is another entry in the expanding list of malicious software written in Go, also known as Golang, which is a relatively young programming language. The startup server script should reuse the built image, not create a new one every time.The BlackBerry Threat Research and Intelligence SPEAR® Team have been tracking a previously unnamed Golang remote access Trojan (RAT) targeting Windows® systems.Intenet Explorer is causing the client to lock up on reverse tunnels.Server configuration file on input with pre-configured tunnels ![]() Authentication between client and server It should show how many connections are established and ports, etc. Note that this will remove the docker container, but any tls generated certificates and configured executables will be in the tls/ and configured/ directories. To exit out of the server, run the exit command: (test) > 0 22:14:52 Endpoint disconnected: test To disconnect a client from the server, you can either issue the "disconnect" command while using the client, or provide the endpoint id in the main menu. Notice how the prompt has changed to indicate it is no longer working with a particular client. To go back and work with another remote system, use the back command: Usually, you will need to create a tunnel from the gTunnel prompt to use the socks server. The following command will start a socks server on port 1080 on the host running gClient. To start a socks proxy server on target, use the socks command. To delete a tunnel, use the "deltunnel" command: To list out all active tunnels, use the "listtunnels" command. Note that the name is optional, and if not provide, will be given random characters as a name. Similarly, to open a port on the remote system on port 666 and forward all traffic to 192.168.1.10 on port 443 in the local network, the command would be as follows: The format isĪddtunnel (local | remote) listenPort destinationIP destinationPortįor example, to open a local tunnel on port 4444 to the ip 10.10.1.5 in the remote network on port 445 and name it "smbtun", the command would be as follows:Īddtunnel local 4444 10.10.1.5 445 smbtun From here, you can add or remove tunnels. The prompt will change to indicate with which endpoint you're currently working. ![]() To use the newly connected client, type use and the name of the client. > 0 22:01:47 Endpoint connected: id: test start_server.sh Once you run the executable on the remote system, you will be notified of the client connecting This will output a configured executable in the "configured" directory, relative to. The first thing to do is generate a client to run on the remote system. This will eventually provide you with the following prompt: If you plan on using forward tunnels, make sure to map those ports or to change the docker network. The start_server.sh script will build a docker image and start it with no exposed ports. GTunnel has been tested with Docker version 19.03.6, but any version of docker should do. Client executables have been tested on windows and linux. I wanted to learn a new language, so I picked go and gRPC. gTunnel can manage multiple forward and reverse tunnels that are all carried over a single TCP/HTTP2 connection. A TCP tunneling suite built with golang and gRPC. ![]()
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