Disable Administrative Share Creation at Startup

Status: test
Severity: medium
Log source: category registry_set, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

Administrative shares are hidden network shares created by Microsoft Windows NT operating systems that grant system administrators remote access to every disk volume on a network-connected system

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1070.005` Indicator Removal: Network Share Connection Removal

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 13: RegistryEvent (Value Set)

Rule body

title: Disable Administrative Share Creation at Startup
id: c7dcacd0-cc59-4004-b0a4-1d6cdebe6f3e
status: test
description: Administrative shares are hidden network shares created by Microsoft Windows NT operating systems that grant system administrators remote access to every disk volume on a network-connected system
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.005/T1070.005.md#atomic-test-4---disable-administrative-share-creation-at-startup
author: frack113
date: 2022-01-16
modified: 2024-03-25
tags:
    - attack.stealth
    - attack.t1070.005
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\Services\LanmanServer\Parameters\'
        TargetObject|endswith:
            - '\AutoShareWks'
            - '\AutoShareServer'
        Details: 'DWORD (0x00000000)'
    condition: selection
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_disable_administrative_share/info.yml
simulation:
    - type: atomic-red-team
      name: Disable Administrative Share Creation at Startup
      technique: T1070.005
      atomic_guid: 99c657aa-ebeb-4179-a665-69288fdd12b8

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    TargetObject|contains: '\Services\LanmanServer\Parameters\'
    TargetObject|endswith:
        - '\AutoShareWks'
        - '\AutoShareServer'
    Details: 'DWORD (0x00000000)'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Details`	eq	`DWORD (0x00000000)` corpus 38 (sigma 36, chronicle 2)	`field:"Details" kind:eq value:"DWORD (0x00000000)"`
`TargetObject`	ends_with	`\AutoShareServer` `\AutoShareWks`	`field:"TargetObject" kind:ends_with`
`TargetObject`	match	`\Services\LanmanServer\Parameters\`	`field:"TargetObject" kind:match value:"\Services\LanmanServer\Parameters\"`