![]() ![]() The command log show -info -predicate 'process = "ssh" or eventMessage contains "ssh"' can be used to review outgoing SSH connection activity. For example, on macOS systems log show -predicate 'process = "sshd"' can be used to review incoming SSH connection attempts for suspicious activity. To set this in your SSH configuration file, edit the file at /. ![]() Monitor for newly executed processes that may use Valid Accounts to log into remote machines using Secure Shell (SSH). Enabling SSH connections over HTTPS If you are able to SSH into over port 443, you can override your SSH settings to force any connection to to run through that server and port. Other factors, such as access patterns and activity that occurs after a remote login, may indicate suspicious or malicious behavior with SSH. Use of SSH may be legitimate depending on the environment and how it’s used. Monitor for newly constructed network connections (typically port 22) that may use Valid Accounts to log into remote machines using Secure Shell (SSH). For example, on Linux systems SSH logon activity can be found in the logs located in /var/log/auth.log or /var/log/secure depending on the distro you are using. Monitor for user accounts logged into systems that may use Valid Accounts to log into remote machines using Secure Shell (SSH). Limit which user accounts are allowed to login via SSH. Require multi-factor authentication for SSH connections wherever possible, such as password protected SSH keys. For macOS ensure Remote Login is disabled under Sharing Preferences. ĭisable the SSH daemon on systems that do not require it. TEMP.Veles has relied on encrypted SSH-based tunnels to transfer tools and for remote command/program execution. TeamTNT has also used SSH to transfer tools and payloads onto victim hosts and execute them. TeamTNT has used SSH to connect back to victim machines. OilRig has used Putty to access compromised systems. Note: When you connect to VMs using the Google Cloud console, Compute Engine creates an ephemeral SSH key for you. In the list of virtual machine instances, click SSH in the row of the instance that you want to connect to. MenuPass has used Putty Secure Copy Client (PSCP) to transfer data. In the Google Cloud console, go to the VM instances page. Leviathan used ssh for internal reconnaissance. ![]() Lazarus Group used SSH and the PuTTy PSCP utility to gain access to a restricted segment of a compromised network. Kinsing has used SSH for lateral movement. įox Kitten has used the PuTTY and Plink tools for lateral movement. įIN7 has used SSH to move laterally through victim environments. Įmpire contains modules for executing commands over SSH as well as in-memory VNC agent injection. Ĭobalt Strike can SSH to a remote service. īlackTech has used Putty for remote access. APT39 used secure shell (SSH) to move laterally among their targets. ![]()
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