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Detection rules › Sigma

Guest Account Enabled Via Sysadminctl

Status
test
Severity
low
Log source
category process_creation, product macos
Author
Sohan G (D4rkCiph3r)
Source
github.com/SigmaHQ/sigma

Detects attempts to enable the guest account using the sysadminctl utility

MITRE ATT&CK coverage

TacticTechniques
Initial Access
Persistence
Privilege Escalation
Stealth

Telemetry coverage

PlatformRecord / event type
macOSESF event exec (NOTIFY): Fires after execve(2) or posix_spawn(2) succeeds, delivering a post-fact record of the new process.

Rule body

title: Guest Account Enabled Via Sysadminctl
id: d7329412-13bd-44ba-a072-3387f804a106
status: test
description: Detects attempts to enable the guest account using the sysadminctl utility
references:
    - https://ss64.com/osx/sysadminctl.html
author: Sohan G (D4rkCiph3r)
date: 2023-02-18
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.stealth
    - attack.t1078
    - attack.t1078.001
logsource:
    category: process_creation
    product: macos
detection:
    selection:
        Image|endswith: '/sysadminctl'
        CommandLine|contains|all:
            # By default the guest account is not active
            - ' -guestAccount'
            - ' on'
    condition: selection
falsepositives:
    - Unknown
level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith: '/sysadminctl'
    CommandLine|contains|all:
        - ' -guestAccount'
        - ' on'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • -guestAccount
  • on
field:"CommandLine" kind:match
Imageends_with
  • /sysadminctl
field:"Image" kind:ends_with value:"/sysadminctl"