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T1686 Disable or Modify System Firewall — Attack Simulation

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…

Complete technique 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.[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.[Broadcom ESXi Firewall][Trellix Rnasomhouse 2024]

Official technique definition · Open in the interactive matrix

Parent and sub-techniques

Related pages are navigation context. Their tools, rules and lab results are not automatically inherited.

Detection telemetry and configuration

These contracts are selected through exact technique-to-data-component relationships or explicitly labelled planning overrides. Configure a collector at the relevant observation point; a telemetry name alone is not coverage.

Command Execution · source-mapped

DC0064 collection page — Collect process command lines and relevant shell/interpreter audit; shell history alone is neither complete nor tamper-resistant.

Providers and collection configuration

  • Enable Script Block Logging through the policy/configuration for the installed edition. Forward Microsoft-Windows-PowerShell/Operational for Windows PowerShell, or PowerShellCore/Operational for PowerShell 7.
  • Retain script-block ID and fragment ordering alongside process creation. Protect access to collected script text; secrets may be included.
  • On Linux, use narrowly scoped Audit execution rules for the lab account and supported architectures, and retain joined SYSCALL/EXECVE/PATH records.

Required normalized fields: interpreter, command_line, actor_uid, session_id.

Illustrative collection event

Project-normalized synthetic JSON, not a native provider log, captured event, attack verdict or validated detection. A parser/adapter is required for a real SIEM. Example names, IPs and values are fictional.

{
  "schema": "1200km.telemetry.example.v1",
  "synthetic": true,
  "timestamp": "2026-09-27T12:00:00Z",
  "telemetry_id": "DC0064",
  "collector": "illustrative-lab-collector",
  "observation": {
    "interpreter": "/bin/sh",
    "command_line": "printf LAB_TELEMETRY_CHECK",
    "actor_uid": 1000,
    "session_id": "lab-session-1"
  }
}

Visibility limits: Script content and process command lines are different signals. Logging may be partial, fragmented, filtered or disabled; never assume a command line reveals everything executed.

Firewall Rule Modification · source-mapped

DC0051 collection page — Collect firewall policy audit plus before/after rule snapshots; identify local versus centrally managed policy and the responsible administrator.

Providers and collection configuration

  • Use a lab-only GPO under Computer Configuration → Windows Settings → Security Settings → Advanced Audit Policy Configuration. Enable the specific subcategory named below.
  • For object-level auditing, configure a narrow system access control list (SACL) on the test object in addition to policy. Do not audit an entire production directory by default.
  • Forward Security events from the responsible host or controller; retain subject and target identities, object identifiers, result and original XML. Confirm effective policy with auditpol /get /category:*.

Required normalized fields: rule_id, attribute, before, after.

Illustrative collection event

Project-normalized synthetic JSON, not a native provider log, captured event, attack verdict or validated detection. A parser/adapter is required for a real SIEM. Example names, IPs and values are fictional.

{
  "schema": "1200km.telemetry.example.v1",
  "synthetic": true,
  "timestamp": "2026-09-27T12:00:00Z",
  "telemetry_id": "DC0051",
  "collector": "illustrative-lab-collector",
  "observation": {
    "rule_id": "lab-rule-1",
    "attribute": "remote_address",
    "before": "192.0.2.10",
    "after": "192.0.2.11"
  }
}

Visibility limits: A policy checkbox alone does not guarantee an event. Host role, SACL, success/failure selection and audit policy precedence matter. Directory changes may arrive as multiple records.

Process Creation · source-mapped

DC0032 collection page — Collect Sysmon ProcessCreate (1); preserve ProcessGuid and parent identifiers. Security 4688 is an alternative with separate audit/command-line settings.

Providers and collection configuration

  • Microsoft Sysmon: Windows event-based collection; enable the event types needed below.
  • Linux Audit: Linux alternative for supported system-call and file events; different semantics and fields.
  • Apple Endpoint Security clients: macOS alternative where the subscribed event exists; requires an entitled, approved client, not an iOS collector.
  • On a disposable Windows host, review the installed Sysmon schema and current configuration; merge scoped event filters into the existing policy rather than replacing it.
  • Forward Microsoft-Windows-Sysmon/Operational to the lab collector. Preserve event ID, timestamp, computer, process identifiers and the original event.
  • For Linux or macOS, select the equivalent sensor separately and test its emitted fields; a Windows event ID does not transfer across platforms.

Required normalized fields: process_guid, image, parent_image, command_line, user.

<EventFiltering>
  <ProcessCreate onmatch="include">
    <Image condition="is">C:\Windows\System32\whoami.exe</Image>
  </ProcessCreate>
</EventFiltering>

This fragment only selects the named process. It is not a complete production policy. Inspect the installed schema with sysmon64 -s; preserve existing rules, then apply the reviewed complete configuration with sysmon64 -c <configuration-file>.

Illustrative collection event

Project-normalized synthetic JSON, not a native provider log, captured event, attack verdict or validated detection. A parser/adapter is required for a real SIEM. Example names, IPs and values are fictional.

{
  "schema": "1200km.telemetry.example.v1",
  "synthetic": true,
  "timestamp": "2026-09-27T12:00:00Z",
  "telemetry_id": "DC0032",
  "collector": "illustrative-lab-collector",
  "observation": {
    "process_guid": "lab-process-001",
    "image": "C:\\Windows\\System32\\whoami.exe",
    "parent_image": "C:\\Windows\\System32\\cmd.exe",
    "command_line": "whoami",
    "user": "LAB\\analyst"
  }
}

Visibility limits: Event filtering and sensor versions change coverage. High-volume image-load and process-access collection needs tuning; endpoint events alone do not establish intent.

Windows Registry Key Modification · source-mapped

DC0063 collection page — Use RegistryEvent 13 for value-set and 14 for rename; compare against intended policy and keep original type/value where available.

Providers and collection configuration

  • Microsoft Sysmon: Windows event-based collection; enable the event types needed below.
  • On a disposable Windows host, review the installed Sysmon schema and current configuration; merge scoped event filters into the existing policy rather than replacing it.
  • Forward Microsoft-Windows-Sysmon/Operational to the lab collector. Preserve event ID, timestamp, computer, process identifiers and the original event.
  • Keep this Windows-specific source separate from other operating systems; there is no direct cross-platform event-ID equivalence.

Required normalized fields: registry_path, event_type, value_type, value.

Illustrative collection event

Project-normalized synthetic JSON, not a native provider log, captured event, attack verdict or validated detection. A parser/adapter is required for a real SIEM. Example names, IPs and values are fictional.

{
  "schema": "1200km.telemetry.example.v1",
  "synthetic": true,
  "timestamp": "2026-09-27T12:00:00Z",
  "telemetry_id": "DC0063",
  "collector": "illustrative-lab-collector",
  "observation": {
    "registry_path": "HKCU\\Software\\Lab\\Mode",
    "event_type": "SetValue",
    "value_type": "DWORD",
    "value": 1
  }
}

Visibility limits: Event filtering and sensor versions change coverage. High-volume image-load and process-access collection needs tuning; endpoint events alone do not establish intent.

Detection rules and analytic guidance

Open the dedicated detection workspace · Existing query engineering

DET0145 Detection of Disabled or Modified System Firewalls across OS Platforms.

MITRE detection strategy

AN0406 Analytic 0406

Detection of firewall tampering by monitoring processes executing netsh, PowerShell Set-NetFirewallProfile, or sc stop mpssvc. Registry modifications under HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy also indicate adversarial actions.

Platforms: Windows.

AN0407 Analytic 0407

Detection of iptables, nftables, or firewalld rule modifications. Correlation of sudden drops in active firewall rules with suspicious processes suggests adversarial evasion.

Platforms: Linux.

  • Command Execution — auditd:SYSCALL; channel execve: iptables, nft, firewall-cmd modifications.
  • Process Creation — linux:osquery; channel execution of known firewall binaries.

AN0408 Analytic 0408

Detection of PF firewall rule modifications via pfctl, socketfilterfw, or defaults write to com.apple.alf. Adversaries often disable firewall profiles entirely or whitelist malicious processes.

Platforms: macOS.

  • Command Execution — macos:unifiedlog; channel pfctl -d, socketfilterfw --setglobalstate off, or modifications to com.apple.alf.

AN0409 Analytic 0409

Detection of firewall changes using esxcli network firewall set or vSphere API modifications. Sudden disabling of firewall rules across management interfaces is a strong adversarial signal.

Platforms: ESXi.

AN0410 Analytic 0410

Detection of firewall ACL or rule base changes through CLI (e.g., no access-list, permit any any). Monitor configuration commits from unusual users or sessions.

Platforms: Network Devices.

Source rule directory and observation requirements

7 exact-tagged source rules. A source tag is a discovery aid, not a relevance verdict. Check the observation point and actual condition of each rule.

Before treating a rule as coverage

  1. Read the actual condition and logsource; identify attacker-side, victim-side or third-party visibility.
  2. Map native sensor fields, parse times and identities, then compile for the selected backend.
  3. Replay a behavior-positive case, a normal control, an authorized look-alike and a missing-telemetry case.
  4. Record matches and misses with rule version and source events. No match is inconclusive when required telemetry is absent.

Anomaly-based detection

No exact technique-specific Atlas model is present for T1686 in the selected source snapshot. The following is a design worksheet, not a newly validated model.

Anomaly engineering worksheet

Start from the exact analytic above. The collection-specific lenses below are analyst recommendations; they do not assert that an arbitrary statistical deviation detects this technique.

  • Script and command execution: Per host role and principal: rare interpreters, command argument patterns and parent-child sequences. Normalize scripts carefully; obfuscation, administrative automation and missing command lines change visibility.
  • Windows and directory audit: Per principal, host and object: unusual access/request rates, new principal-object relationships, and changes outside approved administration windows. Control for service accounts and scheduled directory maintenance.
  • Endpoint activity: Per host role and user: rare process/object combinations, bursts of object access or modification, and ordered parent/action sequences. Compare maintenance windows and signed software rollout activity.
  1. Define an entity/peer group and feature; exclude the evaluation period from baseline training.
  2. Use representative normal and maintenance activity. Do not invent a production threshold from a synthetic example.
  3. Evaluate held-out behavior-positive and benign cases; measure false positives, misses and telemetry loss separately.
  4. Keep abnormality separate from maliciousness. Correlate with the behavior-specific source evidence.

Anomaly Detection Atlas · Baseline, validation and blind spots

Attack tools and documented software

Software observed in source procedures

These are exact ATT&CK software-use relationships, including malware. They provide behavior context, not recommendations to download or execute malware. No safety or detector claim is inherited.

15 source-documented software associations

Simulation design and documented procedures

Atomic evidence: 25 compatible documented candidates. Live lab status: not run for these imported procedures.

Use disposable lab hosts and test accounts, explicit target allowlists, a clean snapshot, bounded egress and a restore plan. Review every candidate and dependency before any execution.

Stop/Start Packet Filter

Stop the Packet Filter if installed.

Pinned Atomic procedure · 0ca82ed1-0a94-4774-9a9a-a2c83a8022b7 · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if pfctl is installed on the machine.
Opening ports for proxy - HARDRAIN

This test creates a listening interface on a victim device. This tactic was used by HARDRAIN for proxying.

reference: https://www.us-cert.gov/sites/default/files/publications/MAR-10135536-F.pdf

Pinned Atomic procedure · 15e57006-79dd-46df-9bf9-31bc24fb5a80 · windows · command_prompt.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Tail the UFW firewall log file

Print the last 10 lines of the Uncomplicated Firewall (UFW) log file
/var/log/ufw.log.

Pinned Atomic procedure · 419cca0c-fa52-4572-b0d7-bc7c6f388a27 · linux · sh.

Elevation: required. Cleanup: not declared. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if /var/log/ufw.log exists.
Allow Executable Through Firewall Located in Non-Standard Location

This test will attempt to allow an executable through the system firewall located in the Users directory

Pinned Atomic procedure · 6f5822d2-d38d-4f48-9bfc-916607ff6b8c · windows · powershell.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

Source-defined inputs

  • exe_file_path: path to exe file (type path; source default PathToAtomicsFolder\T1686\bin\AtomicTest.exe)

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Disable iptables

Some Linux systems may not activate ufw, but use iptables for firewall rules instead. (ufw works on top of iptables.)
Attackers cannot directly disable iptables, as it is not implemented as a service like ufw. But they can flush all iptables
rules, which in fact "disable" iptables.

Pinned Atomic procedure · 7784c64e-ed0b-4b65-bf63-c86db229fd56 · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if iptables is installed on the machine.
Edit UFW firewall main configuration file

Edit the Uncomplicated Firewall (UFW) main configuration file for setting
default policies /etc/default/ufw.

Pinned Atomic procedure · 7b697ece-8270-46b5-bbc7-6b9e27081831 · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if /etc/default/ufw exists.
LockBit Black - Unusual Windows firewall registry modification -Powershell

An adversary tries to modify the windows firewall registry.

Pinned Atomic procedure · 80b453d1-eec5-4144-bf08-613a6c3ffe12 · windows · powershell.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Disable Microsoft Defender Firewall

Disables the Microsoft Defender Firewall for the current profile.
Caution if you access remotely the host where the test runs! Especially with the cleanup command which will re-enable firewall for the current profile...

Pinned Atomic procedure · 88d05800-a5e4-407e-9b53-ece4174f197f · windows · command_prompt.

Elevation: not declared required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Modify/delete iptables firewall rules

Instead of completely "disabling" iptables, adversaries may choose to delete a certain rule, which, for example, blocks data exfiltration via ftp.
By doing so, they may cause less noise to avoid detection.

Pinned Atomic procedure · 899a7fb5-d197-4951-8614-f19ac4a73ad4 · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if iptables is installed on the machine.
Turn off UFW logging

Turn off the Uncomplicated Firewall (UFW) logging.

Pinned Atomic procedure · 8a95b832-2c2a-494d-9cb0-dc9dd97c8bad · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if ufw is installed on the machine and enabled.
Add and delete Packet Filter rules

Add and delete a rule on the Packet Filter (PF) if installed and enabled.

Pinned Atomic procedure · 8b23cae1-66c1-41c5-b79d-e095b6098b5b · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if pf is installed on the machine and enabled.
Blackbit - Disable Windows Firewall using netsh firewall

An adversary tries to modify the windows firewall configuration using the deprecated netsh firewall command (command still works).

Pinned Atomic procedure · 91f348e6-3760-4997-a93b-2ceee7f254ee · windows · command_prompt.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Set a firewall rule using New-NetFirewallRule

This test will attempt to create a new inbound/outbound firewall rule using the New-NetFirewallRule commandlet.

Pinned Atomic procedure · 94be7646-25f6-467e-af23-585fb13000c8 · windows · powershell.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

Source-defined inputs

  • direction: Direction can be Inbound or Outbound (type string; source default Inbound)
  • local_port: This is the local port you wish to test opening (type integer; source default 21)
  • protocol: This is the protocol (type string; source default TCP)
  • action: This is the action (type string; source default allow)

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Open a local port through Windows Firewall to any profile

This test will attempt to open a local port defined by input arguments to any profile

Pinned Atomic procedure · 9636dd6e-7599-40d2-8eee-ac16434f35ed · windows · powershell.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

Source-defined inputs

  • local_port: This is the local port you wish to test opening (type integer; source default 3389)

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Stop/Start UFW firewall systemctl

Stop the Uncomplicated Firewall (UFW) if installed, using systemctl.

Pinned Atomic procedure · 9fd99609-1854-4f3c-b47b-97d9a5972bd1 · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if systemctl and ufw is installed on the machine.
LockBit Black - Unusual Windows firewall registry modification -cmd

An adversary tries to modify the windows firewall registry

Pinned Atomic procedure · a4651931-ebbb-4cde-9363-ddf3d66214cb · windows · command_prompt.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

ESXi - Set Firewall to PASS Traffic

This test sets the default ESXi firewall action to PASS instead of DROP. This allows all incoming and outgoing traffic.

Pinned Atomic procedure · a67e8aea-ea7c-4c3b-9b1b-8c2957c3091d · windows · command_prompt.

Elevation: not declared required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

Source-defined inputs

  • vm_host: Specify the host name or IP of the ESXi server. (type string; source default atomic.local)
  • vm_user: Specify the privilege user account on the ESXi server. (type string; source default root)
  • vm_pass: Specify the privileged user's password. (type string; source default password)
  • plink_file: Path to Plink (type path; source default PathToAtomicsFolder\..\ExternalPayloads\plink.exe)

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • The plink executable must be found in the ExternalPayloads folder.
Disable Microsoft Defender Firewall via Registry

Disables the Microsoft Defender Firewall for the public profile via registry
Caution if you access remotely the host where the test runs! Especially with the cleanup command which will re-enable firewall for the current profile...

Pinned Atomic procedure · afedc8c4-038c-4d82-b3e5-623a95f8a612 · windows · command_prompt.

Elevation: not declared required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Add and delete UFW firewall rules

Add and delete a rule on the Uncomplicated Firewall (UFW) if installed and enabled.

Pinned Atomic procedure · b2563a4e-c4b8-429c-8d47-d5bcb227ba7a · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if ufw is installed on the machine and enabled.
ESXi - Disable Firewall via Esxcli

Adversaries may disable the ESXI firewall via ESXCLI

Pinned Atomic procedure · bac8a340-be64-4491-a0cc-0985cb227f5a · windows · command_prompt.

Elevation: not declared required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

Source-defined inputs

  • vm_host: Specify the host name of the ESXi Server (type string; source default atomic.local)
  • plink_file: Path to Putty (type path; source default PathToAtomicsFolder\..\ExternalPayloads\plink.exe)
  • username: username used to log into ESXi (type string; source default root)
  • password: password used to log into ESXI (type string; source default n/a)

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • The plink executable must be found in the ExternalPayloads folder.
Edit UFW firewall user.rules file

Edit the Uncomplicated Firewall (UFW) rules file /etc/ufw/user.rules.

Pinned Atomic procedure · beaf815a-c883-4194-97e9-fdbbb2bbdd7c · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if /etc/ufw/user.rules exists.
Edit UFW firewall ufw.conf file

Edit the Uncomplicated Firewall (UFW) configuration file /etc/ufw/ufw.conf
which controls if the firewall starts on boot and its logging level.

Pinned Atomic procedure · c1d8c4eb-88da-4927-ae97-c7c25893803b · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if /etc/ufw/ufw.conf exists.
Edit UFW firewall sysctl.conf file

Edit the Uncomplicated Firewall (UFW) configuration file for setting network
variables /etc/ufw/sysctl.conf.

Pinned Atomic procedure · c4ae0701-88d3-4cd8-8bce-4801ed9f97e4 · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if /etc/ufw/sysctl.conf exists.
Allow SMB and RDP on Microsoft Defender Firewall

Allow all SMB and RDP rules on the Microsoft Defender Firewall for all profiles.
Caution if you access remotely the host where the test runs! Especially with the cleanup command which will reset the firewall and risk disabling those services...

Pinned Atomic procedure · d9841bf8-f161-4c73-81e9-fd773a5ff8c1 · windows · command_prompt.

Elevation: not declared required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

Stop/Start UFW firewall

Stop the Uncomplicated Firewall (UFW) if installed.

Pinned Atomic procedure · fe135572-edcd-49a2-afe6-1d39521c5a9a · linux · sh.

Elevation: required. Cleanup: defined upstream; review required. This is source documentation, not an execution approval.

No input arguments declared.

Review the upstream command, dependencies and cleanup at the source link. Source defaults may refer to real infrastructure or destructive actions; they are not authorized targets. No automatic install, prerequisite download or command execution is provided.

1 prerequisite definitions:

  • Check if ufw is installed on the machine.

Technique-specific experiment contract

  1. Choose one procedure implementing T1686 Disable or Modify System Firewall; identify the observable behavior in the source definition, not just its tactic.
  2. Record exact target, tool/version, inputs, privileges, network limits and approval. Never run an imported default target automatically.
  3. Enable the collection sources above and verify a benign baseline reaches the detector.
  4. Run only the approved isolated scenario; capture native events and an independent behavior observable.
  5. Evaluate the exact rule/model, restore the lab, and preserve configuration, event hashes, alerts, controls and misses.

Synthetic logs and offline contract check

Download synthetic collection fixture (JSON) · Download the complete engineering workbook

This fixture exercises the listed collection fields. It does not reproduce Disable or Modify System Firewall, label its example events as malicious, or measure detection effectiveness. Use the exact analytic and selected procedure to build an independently labelled behavior-positive dataset.

Not run in this browser. No network scan or attack command is executed by this control.

Validation status and remaining work

Source identity
Joined by exact technique/object IDs against hash-pinned sources.
Collection fixture
Available for offline schema exercises; not attack emulation.
Native telemetry / backend / real attack
Not validated for these imported procedures. Source fidelity and page tests cannot establish sensor or detector effectiveness.

All-page audit and evidence inventory · This page’s machine-readable workbook

Sources and evidence boundaries

Pinned MITRE STIX source · SHA-256 81113ba98afa2928f3dcff62022539f7ce30c315c32e14422f11ff95ce534352. Definition and procedure context are reproduced from this snapshot, not independently re-investigated incidents.

Source-linked mitigations

Connected ecosystem references

Linked tags

enterprisecloud-hosted-endpointnetwork-infrastructureonpremvirtualizationESXiLinuxmacOSNetwork DevicesWindowsdefense-impairmentisolated_authorized_labprocedure_review_requiredtelemetry_configuration_requiredsome_candidates_require_elevationpotential_disruption_requires_individual_review
Atomic candidate documentedtechniquesource_mapped

Source procedure platform / method / executor tags:

linuxautomatedshwindowscommand_promptpowershell

Detection and collection

T1686 detection workspace

Threat actor context

These are explicit actor-to-technique associations in the existing Threat Matrix snapshot, not attribution of an event or proof that a detector identifies the actor. No tool-to-actor relationship is inferred.

Existing research

Threat Matrix: knowledge routes, evidence and actor context

Pinned research references. No browser attack runner or production-validated detector is asserted. Imported procedures remain unvalidated; any bounded lab evidence has its own scope. ATT&CK / Atomic provenance · Detection provenance.