Adversaries may use Valid Accounts to log into remote machines using Secure Shell (SSH). The adversary may then perform actions as the logged-on user.
SSH is a protocol that allows authorized users to open remote shells on other computers. Many Linux and macOS versions come with SSH installed by default, although typically disabled until the user enables it. On ESXi, SSH can be enabled either directly on the host (e.g., via vim-cmd hostsvc/enable_ssh) or via vCenter.(Citation: Sygnia ESXi Ransomware 2025)(Citation: TrendMicro ESXI Ransomware)(Citation: Sygnia Abyss Locker 2025) The SSH server can be configured to use standard password authentication or public-private keypairs in lieu of or in addition to a password. In this authentication scenario, the user’s public key must be in a special file on the computer running the server that lists which keypairs are allowed to login as that user (i.e., SSH Authorized Keys).
| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| IAM-06 | User Access Provisioning | mitigates | T1021.004 | SSH |
Comments
This control describes the implementation of a secure and controlled user access provisioning process. Proper user account management reduces the attack surface by limiting unauthorized access to data, assets, and systems. Managing account access authorizations can reduce the risk of privilege escalation by ensuring accounts cannot perform unauthorized actions.
References
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| IAM-07 | User Access Changes and Revocation | mitigates | T1021.004 | SSH |
Comments
This control focuses on the secure deprovisioning of user access by automating account removal, detecting and revoking inactive accounts. These mitigative actions reduce the risk of lingering or inappropriate access following employee termination, role changes, or security incidents.
References
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