rules/windows/sysmon/sysmon_config_modification_error.yml

title: Sysmon Configuration Error
id: 815cd91b-7dbc-4247-841a-d7dd1392b0a8
description: Someone try to hide from Sysmon
status: experimental
author: frack113
date: 2021/06/04
modified: 2022/02/09
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md
    - https://talesfrominfosec.blogspot.com/2017/12/killing-sysmon-silently.html
tags:
    - attack.defense_evasion
    - attack.t1564
logsource:
    product: windows
    category: sysmon_error
detection:
    selection_error:
        Description|contains:
            - 'Failed to open service configuration with error'
            - 'Failed to connect to the driver to update configuration'
    selection_filter:
        Description|contains|all:
            - 'Failed to open service configuration with error'
            - 'Last error: The media is write protected.'
    condition: selection_error and not selection_filter
falsepositives:
    - Legitimate administrative action
level: high
$frack113$ Split global rules 2021-09-07 13:30:32 +02:00			`title: Sysmon Configuration Error`
			`id: 815cd91b-7dbc-4247-841a-d7dd1392b0a8`
$frack113$ Detect modification of sysmon configuration by sysmon 2021-06-04 11:27:15 +02:00			`description: Someone try to hide from Sysmon`
			`status: experimental`
			`author: frack113`
			`date: 2021/06/04`
fix: several FPs against a fresh installed Windows with example applications and basic user interaction 2022-02-09 17:46:49 +01:00			`modified: 2022/02/09`
$frack113$ Detect modification of sysmon configuration by sysmon 2021-06-04 11:27:15 +02:00			`references:`
$frack113$ Get a new error after another Atomic Test 2021-06-04 13:20:10 +02:00			`- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md`
$frack113$ Detect modification of sysmon configuration by sysmon 2021-06-04 11:27:15 +02:00			`- https://talesfrominfosec.blogspot.com/2017/12/killing-sysmon-silently.html`
			`tags:`
			`- attack.defense_evasion`
			`- attack.t1564`
$frack113$ convert eventID to category 2021-06-10 16:36:14 +02:00			`logsource:`
			`product: windows`
			`category: sysmon_error`
			`detection:`
$frack113$ Detect modification of sysmon configuration by sysmon 2021-06-04 11:27:15 +02:00			`selection_error:`
			`Description\|contains:`
			`- 'Failed to open service configuration with error'`
$frack113$ Get a new error after another Atomic Test 2021-06-04 13:20:10 +02:00			`- 'Failed to connect to the driver to update configuration'`
fix: FP which happens more frequently under normal circumstances 2021-11-12 13:31:25 +01:00			`selection_filter:`
fix: several FPs against a fresh installed Windows with example applications and basic user interaction 2022-02-09 17:46:49 +01:00			`Description\|contains\|all:`
			`- 'Failed to open service configuration with error'`
			`- 'Last error: The media is write protected.'`
adding filter for false positive. no risk to sysmon operation 2021-12-02 20:38:58 +00:00			`condition: selection_error and not selection_filter`
$frack113$ Split global rules 2021-09-07 13:30:32 +02:00			`falsepositives:`
fix: legitimate --> Legitimate 2022-03-16 14:35:19 +01:00			`- Legitimate administrative action`
adding filter for false positive. no risk to sysmon operation 2021-12-02 20:38:58 +00:00			`level: high`