Applied Cybernetics Group
T1021 — Remote Services
- Technique
T1021- Tactics
- Lateral Movement
- MISP citations
- 0
- KEV CVEs mapped
- 4
- Community rules
- 10
- thrunt rules
- 0
- Upstream
- https://attack.mitre.org/techniques/T1021
MITRE description
Adversaries may use [Valid Accounts](https://attack.mitre.org/techniques/T1078) to log into a service that accepts remote connections, such as telnet, SSH, and VNC. The adversary may then perform actions as the logged-on user. In an enterprise environment, servers and workstations can be organized into domains. Domains provide centralized identity management, allowing users to login using one set of credentials across the entire network. If an adversary is able to obtain a set of valid domain credentials, they could login to many different machines using remote access protocols such as secure shell (SSH) or remote desktop protocol (RDP).(Citation: SSH Secure Shell)(Citation: TechNet Remote Desktop Services) They could also login to accessible SaaS or IaaS services, such as those that federate their identities to the domain, or management platforms for internal virtualization environments such as VMware vCenter. Legitimate applications (such as [Software Deployment Tools](https://attack.mitre.org/techniques/T1072) and other administrative programs) may utilize [Remote Services](https://attack.mitre.org/techniques/T1021) to access remote hosts. For example, Apple Remote Desktop (ARD) on macOS is native software used for remote management. ARD leverages a blend of protocols, including [VNC](https://attack.mitre.org/techniques/T1021/005) to send the screen and control buffers and [SSH](https://attack.mitre.org/techniques/T1021/004) for secure file transfer.(Citation: Remote Management MDM macOS)(Citation: Kickstart Apple Remote Desktop commands)(Citation: Apple Remote Desktop Admin Guide 3.3) Adversaries can abuse applications such as ARD to gain remote code execution and perform lateral movement. In versions of macOS prior to 10.14, an adversary can escalate an SSH session to an ARD session which enables an adversary to accept TCC (Transparency, Consent, and Control) prompts without user interaction and gain access to data.(Citation: FireEye 2019 Apple Remote Desktop)(Citation: Lockboxx ARD 2019)(Citation: Kickstart Apple Remote Desktop commands)
KEV CVEs mapped to this technique
Per MITRE CTID's hand-curated KEV→ATT&CK mappings — these are the actively-exploited vulnerabilities behind this technique's KEV signal.
Detection coverage
SigmaHQ community rules
- OpenCanary - FTP Login Attempt (core)
- OpenCanary - SMB File Open Request (core)
- OpenCanary - SNMP OID Request (core)
- OpenCanary - SSH Login Attempt (core)
- OpenCanary - SSH New Connection Attempt (core)
- OpenCanary - VNC Connection Attempt (core)
- HackTool - NetExec Execution (core)
- Privilege Escalation via Named Pipe Impersonation (core)
- Potential Remote Desktop Tunneling (core)
- Psexec Execution (core)