Service RemoteRegistry is in stopped state SMBD-Thread-4: Connection from DEV/ controlled, but there are no more targets left! Authenticating against smb://10.10.17.68 as DEV/NLAMB SUCCEED SMBD-Thread-4: Connection from DEV/ controlled, attacking target smb://10.10.17.68 By default, it dumps the local SAM database. The traffic flow will look something like this:Īs expected, the traffic has been tunnelled all the way to my WSL instance where ntlmrelayx is listening and it has relayed the traffic to the target machine back on the internal network. Baller.įinally, for the relaying tool to send traffic back into the target network, we can just use the socks command. This means that you can run the relaying tools in a VM or in WSL of your own machine.
![install cobalt strike install cobalt strike](https://www.trendmicro.com/content/dam/trendmicro/global/en/what-is/ransomware/ryuk-infection-path-diagram.jpg)
The rportfwd_local command differs in that instead of tunnelling the traffic only as far as the team server, it will be forwarded to the machine running the Cobalt Strike client of the operator who started it. The inconvenience is that it requires that your relaying tools are running on either the team server itself, or on another machine that is routable from the team server. On this port, we can start a reverse port forward which will redirect the traffic again to a location where the relay tools are running.Ĭobalt Strike does have an rportfwd command, which will bind a port on the compromised machine, tunnel that traffic back to the team server, and forward it to the specified IP and port. These tools allow us to direct traffic incoming on port 445 to another, arbitrary local port. Both are generic enough implementations that can be run via practically any C2 framework, though PortBender has the added perk of including an Aggressor Script.
![install cobalt strike install cobalt strike](https://holdmybeersecurity.com/wp-content/uploads/2018/11/dnscomms2-300x179.png)
DivertTCPconn & StreamDivert compile to an EXE and PortBender to a reflective DLL. There are multiple projects out there that leverage WinDivert to achieve this style of traffic redirection in post-ex tools, including DivertTCPconn, StreamDivert, and PortBender.
INSTALL COBALT STRIKE DRIVER
This is a driver (yes, a driver) which is capable of intercepting and redirecting incoming network packets before they can hit the underlying services. Redirecting the incoming traffic on port 445 is the slightly tricky part, but is possible using a tool such as WinDivert. This second point is easy to solve, we can just run them on a local Linux VM or WSL, and tunnel the traffic to it. The popular Python tools won’t run natively on Windows.Port 445 is already bound by the OS, so you can’t simply sniff incoming traffic.
INSTALL COBALT STRIKE WINDOWS
Assuming you’ve compromised a Windows endpoint: However, relaying through a C2 framework is a bit less trivial for a few reasons. It’s probably safe to say that NTLM relaying isn’t going to vanish anytime soon. And there are also services that are vulnerable to relaying in their default configuration, such as Active Directory Certificate Services. \\attacker-ip\pwn.icon), place it in a network share and wait for a user to browse that share. For instance – create a Windows shortcut with the icon set to a UNC path (e.g. There are tactics to coerce requests that specifically target the address you’re listening on.
![install cobalt strike install cobalt strike](https://holdmybeersecurity.com/wp-content/uploads/2018/11/dnsbeaconinaction-300x297.png)
It therefore sends broadcast requests which tools like responder will send poisoned responses for. The majority of opportunistic relays come when a user or a machine tries to access an SMB resource that doesn’t exist.
![install cobalt strike install cobalt strike](https://user-images.githubusercontent.com/17826492/48107865-13c06c80-e27c-11e8-9f70-941152907781.png)
Just roll up at the client site, plug your laptop into the LAN, fire up responder and ntlmrelayx, and away you go. NTLM relaying is a popular attack strategy during a penetration test and is really trivial to perform.