- Tactics
- defense-impairment
- Platforms
- ESXi, Linux, macOS, Network Devices, Windows
- Reference
- attack.mitre.org/techniques/T1686
Description
Adversaries may disable or modify host-based or network firewalls to impair defensive mechanisms and enable further action. Once an adversary has gathered sufficient privileges, they can tamper with firewall services, policies, or rule sets to remove restrictions on inbound or outbound traffic. For example, this may include turning off firewall profiles, altering existing rules to permit previously blocked ports or protocols, or adding new rules that create covert communication paths (e.g., adding a new firewall rule for a well-known protocol (such as RDP) using a non-traditional and potentially less securitized port.(Citation: change_rdp_port_conti)
Adversaries may disable or modify firewalls using different behaviors, depending on the platform. For example, in ESXi, firewall rules may be modified directly via the esxcli (e.g., via esxcli network firewall set) or via the vCenter user interface.(Citation: Broadcom ESXi Firewall)(Citation: Trellix Rnasomhouse 2024)
Sub-techniques
How GTK Cyber trains on this
GTK Cyber's Threat Hunting with Data Science course teaches you to build machine-learning detections for techniques like this across the MITRE ATT&CK framework, including the defense-impairment tactic this technique falls under. Practitioner-led, focused on real detections, not memorizing technique IDs.
Related techniques
- T1112 — Modify Registry
- T1207 — Rogue Domain Controller
- T1222 — File and Directory Permissions Modification
- T1484 — Domain or Tenant Policy Modification
- T1553 — Subvert Trust Controls
- T1556 — Modify Authentication Process
- T1578 — Modify Cloud Compute Infrastructure
- T1599 — Network Boundary Bridging
- T1600 — Weaken Encryption
- T1601 — Modify System Image
- T1647 — Plist File Modification
- T1666 — Modify Cloud Resource Hierarchy