Disabling Security Tools

Status: test
Severity: medium
Log source: product linux, category process_creation
Author: Ömer Günal, Alejandro Ortuno, oscd.community
Source: github.com/SigmaHQ/sigma

Detects disabling security tools

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: Disabling Security Tools
id: e3a8a052-111f-4606-9aee-f28ebeb76776
status: test
description: Detects disabling security tools
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.004/T1562.004.md
author: Ömer Günal, Alejandro Ortuno, oscd.community
date: 2020-06-17
modified: 2022-10-09
tags:
    - attack.defense-impairment
    - attack.t1686
logsource:
    category: process_creation
    product: linux
detection:
    selection_iptables_1:
        Image|endswith: '/service'
        CommandLine|contains|all:
            - 'iptables'
            - 'stop'
    selection_iptables_2:
        Image|endswith: '/service'
        CommandLine|contains|all:
            - 'ip6tables'
            - 'stop'
    selection_iptables_3:
        Image|endswith: '/chkconfig'
        CommandLine|contains|all:
            - 'iptables'
            - 'stop'
    selection_iptables_4:
        Image|endswith: '/chkconfig'
        CommandLine|contains|all:
            - 'ip6tables'
            - 'stop'
    selection_firewall_1:
        Image|endswith: '/systemctl'
        CommandLine|contains|all:
            - 'firewalld'
            - 'stop'
    selection_firewall_2:
        Image|endswith: '/systemctl'
        CommandLine|contains|all:
            - 'firewalld'
            - 'disable'
    selection_carbonblack_1:
        Image|endswith: '/service'
        CommandLine|contains|all:
            - 'cbdaemon'
            - 'stop'
    selection_carbonblack_2:
        Image|endswith: '/chkconfig'
        CommandLine|contains|all:
            - 'cbdaemon'
            - 'off'
    selection_carbonblack_3:
        Image|endswith: '/systemctl'
        CommandLine|contains|all:
            - 'cbdaemon'
            - 'stop'
    selection_carbonblack_4:
        Image|endswith: '/systemctl'
        CommandLine|contains|all:
            - 'cbdaemon'
            - 'disable'
    selection_selinux:
        Image|endswith: '/setenforce'
        CommandLine|contains: '0'
    selection_crowdstrike_1:
        Image|endswith: '/systemctl'
        CommandLine|contains|all:
            - 'stop'
            - 'falcon-sensor'
    selection_crowdstrike_2:
        Image|endswith: '/systemctl'
        CommandLine|contains|all:
            - 'disable'
            - 'falcon-sensor'
    condition: 1 of selection*
falsepositives:
    - Legitimate administration activities
level: medium

Stages and Predicates

Stage 0: `condition`

1 of selection*

Stage 1: `selection_iptables_1`

selection_iptables_1:
    Image|endswith: '/service'
    CommandLine|contains|all:
        - 'iptables'
        - 'stop'

Stage 2: `selection_iptables_2`

selection_iptables_2:
    Image|endswith: '/service'
    CommandLine|contains|all:
        - 'ip6tables'
        - 'stop'

Stage 3: `selection_iptables_3`

selection_iptables_3:
    Image|endswith: '/chkconfig'
    CommandLine|contains|all:
        - 'iptables'
        - 'stop'

Stage 4: `selection_iptables_4`

selection_iptables_4:
    Image|endswith: '/chkconfig'
    CommandLine|contains|all:
        - 'ip6tables'
        - 'stop'

Stage 5: `selection_firewall_1`

selection_firewall_1:
    Image|endswith: '/systemctl'
    CommandLine|contains|all:
        - 'firewalld'
        - 'stop'

Stage 6: `selection_firewall_2`

selection_firewall_2:
    Image|endswith: '/systemctl'
    CommandLine|contains|all:
        - 'firewalld'
        - 'disable'

Stage 7: `selection_carbonblack_1`

selection_carbonblack_1:
    Image|endswith: '/service'
    CommandLine|contains|all:
        - 'cbdaemon'
        - 'stop'

Stage 8: `selection_carbonblack_2`

selection_carbonblack_2:
    Image|endswith: '/chkconfig'
    CommandLine|contains|all:
        - 'cbdaemon'
        - 'off'

Stage 9: `selection_carbonblack_3`

selection_carbonblack_3:
    Image|endswith: '/systemctl'
    CommandLine|contains|all:
        - 'cbdaemon'
        - 'stop'

Stage 10: `selection_carbonblack_4`

selection_carbonblack_4:
    Image|endswith: '/systemctl'
    CommandLine|contains|all:
        - 'cbdaemon'
        - 'disable'

Stage 11: `selection_selinux`

selection_selinux:
    Image|endswith: '/setenforce'
    CommandLine|contains: '0'

Stage 12: `selection_crowdstrike_1`

selection_crowdstrike_1:
    Image|endswith: '/systemctl'
    CommandLine|contains|all:
        - 'stop'
        - 'falcon-sensor'

Stage 13: `selection_crowdstrike_2`

selection_crowdstrike_2:
    Image|endswith: '/systemctl'
    CommandLine|contains|all:
        - 'disable'
        - 'falcon-sensor'

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	`0` `cbdaemon` `disable` `falcon-sensor` `firewalld` `ip6tables` `iptables` `off` `stop`
`Image`	ends_with	`/chkconfig` `/service` `/setenforce` `/systemctl`

`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)

Disabling Security Tools

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_iptables_1`

Stage 2: `selection_iptables_2`

Stage 3: `selection_iptables_3`

Stage 4: `selection_iptables_4`

Stage 5: `selection_firewall_1`

Stage 6: `selection_firewall_2`

Stage 7: `selection_carbonblack_1`

Stage 8: `selection_carbonblack_2`

Stage 9: `selection_carbonblack_3`

Stage 10: `selection_carbonblack_4`

Stage 11: `selection_selinux`

Stage 12: `selection_crowdstrike_1`

Stage 13: `selection_crowdstrike_2`

Indicators

Keyboard shortcuts

Search operators

Disabling Security Tools

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_iptables_1

Stage 2: selection_iptables_2

Stage 3: selection_iptables_3

Stage 4: selection_iptables_4

Stage 5: selection_firewall_1

Stage 6: selection_firewall_2

Stage 7: selection_carbonblack_1

Stage 8: selection_carbonblack_2

Stage 9: selection_carbonblack_3

Stage 10: selection_carbonblack_4

Stage 11: selection_selinux

Stage 12: selection_crowdstrike_1

Stage 13: selection_crowdstrike_2

Indicators

Stage 0: `condition`

Stage 1: `selection_iptables_1`

Stage 2: `selection_iptables_2`

Stage 3: `selection_iptables_3`

Stage 4: `selection_iptables_4`

Stage 5: `selection_firewall_1`

Stage 6: `selection_firewall_2`

Stage 7: `selection_carbonblack_1`

Stage 8: `selection_carbonblack_2`

Stage 9: `selection_carbonblack_3`

Stage 10: `selection_carbonblack_4`

Stage 11: `selection_selinux`

Stage 12: `selection_crowdstrike_1`

Stage 13: `selection_crowdstrike_2`