![]() ![]() Determine the initial vector abused by the attacker and take action to prevent reinfection through the same vector. This may reveal additional artifacts left in the system, persistence mechanisms, and Reset passwords for these accounts and other potentially compromised credentials, such as email, business Investigate credential exposure on systems compromised or used by the attacker to ensure all compromised accounts are Inspect the host to learn which method was used and to determine a response for the case. An SSH tunnel is another method of rerouting some or all traffic from one location (like your local computer) through another (your remote server). Take the necessary actions to disable the tunneling, which can be a process kill, service deletion, registry key Isolate the involved host to prevent further post-compromise behavior. There is a firewall between Windows PC Local and the Network A Linux Server that only allows me to SSH from PC local to the Linux Server on Network A. Initiate the incident response process based on the outcome of the triage. 1 How would I use SSH Tunneling for an architecture in the example below Scenario: I am physically logged into Windows PC Local and wish to remote desktop into the Windows PC Remote using port 3389. Investigate the command line for the execution of programs that are unrelated to tunneling, like Remote Desktop clients. Benign true positives (B-TPs) can be added as exceptions if necessary. This activity is unlikely to happen legitimately. Examine network data to determine if the host communicated with external servers using the tunnel. Assess whether this behavior is prevalent in the environment by looking for similar occurrences across hosts. Investigate other alerts associated with the user/host during the past 48 hours. Contact the account and system owners and confirm whether they are aware of this activity. Identify the user account that performed the action and whether it should perform this kind of action. Examine their executable filesįor prevalence, whether they are located in expected locations, and if they are signed with valid digital signatures. Investigate the process execution chain (parent process tree) for unknown processes. You have access to the office’s SSH server at, and your user account on the SSH server is bob. This rule looks for command lines involving the `3389` port, which RDP uses by default and options commonly associated The syntax is: ssh -L localport:remoteaddress:remoteport For example, let’s say the database server at your office is located at 192.168.1.111 on the office network. Ranging from providing an outer layer of encryption (similar to a VPN) to enabling traffic that network appliances wouldĪttackers may tunnel Remote Desktop Protocol (RDP) traffic through other protocols like Secure Shell (SSH) to bypass network restrictions that block incoming RDPĬonnections but may be more permissive to other protocols. To do this in the PuTTY application on Windows, select Connection > SSH > Tunnels. Protocol Tunneling is a mechanism that involves explicitly encapsulating a protocol within another for various use cases, # Investigating Potential Remote Desktop Tunneling Detected ![]()
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