UFW Disable Attempt

Status: test
Severity: medium
Log source: product linux, category process_creation
Author: Joseliyo Sanchez, @Joseliyo_Jstnk
Source: github.com/SigmaHQ/sigma

Detects attempts to disable the Uncomplicated Firewall (UFW) on Linux systems. UFW is a popular firewall management tool that provides an easy-to-use interface for configuring firewall rules. Disabling UFW can leave a system vulnerable to attacks, as it may allow unauthorized access to network services and resources.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Impairment	`T1686` Disable or Modify System Firewall

Event coverage

Provider	Event
Sysmon-for-Linux	Event ID 1

Rule body yaml

title: UFW Disable Attempt
id: 84c9e83c-599a-458a-a0cb-0ecce44e807a
status: test
description: |
    Detects attempts to disable the Uncomplicated Firewall (UFW) on Linux systems.
    UFW is a popular firewall management tool that provides an easy-to-use interface for configuring firewall rules.
    Disabling UFW can leave a system vulnerable to attacks, as it may allow unauthorized access to network services and resources.
references:
    - https://twitter.com/Joseliyo_Jstnk/status/1620131033474822144
    - https://manpages.debian.org/unstable/ufw/ufw-framework.8.en.html
    - https://www.cyberciti.biz/faq/linux-disable-firewall-command/
author: Joseliyo Sanchez, @Joseliyo_Jstnk
date: 2023-01-18
modified: 2026-05-04
tags:
    - attack.defense-impairment
    - attack.t1686
logsource:
    product: linux
    category: process_creation
detection:
    selection_ufw_init:
        Image|endswith: '/ufw-init'
        CommandLine|contains:
            - ' force-stop' # same as stop, except does not check if the firewall is already loaded
            - ' stop' # unloads the firewall
            - ' flush' # flushes the built-in chains, deletes all non-built-in chains and resets the policy to ACCEPT
    selection_ufw_disable:
        CommandLine|contains|all:
            # Covers both ufw disable and systemctl disable ufw
            # systemctl disable ufw -- prevents UFW starting at boot, but does not stop the currently running instance of UFW
            # ufw disable -- stops the currently running instance of UFW and prevents it from starting at boot
            - 'ufw '
            - 'disable'
    condition: 1 of selection_*
falsepositives:
    - Legitimate actions by system administrators to disable UFW.
level: medium

Stages and Predicates

Stage 0: `condition`

1 of selection_*

Stage 1: `selection_ufw_init`

selection_ufw_init:
    Image|endswith: '/ufw-init'
    CommandLine|contains:
        - ' force-stop'
        - ' stop'
        - ' flush'

Stage 2: `selection_ufw_disable`

selection_ufw_disable:
    CommandLine|contains|all:
        - 'ufw '
        - 'disable'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`flush` `force-stop` `stop` `disable` `ufw`
`Image`	ends_with	`/ufw-init`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

UFW Disable Attempt

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_ufw_init`

Stage 2: `selection_ufw_disable`

Indicators

Keyboard shortcuts

Search operators

UFW Disable Attempt

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_ufw_init

Stage 2: selection_ufw_disable

Indicators

Stage 0: `condition`

Stage 1: `selection_ufw_init`

Stage 2: `selection_ufw_disable`