Nasreddine Bencherchali
46 lines
1.7 KiB
YAML
46 lines
1.7 KiB
YAML
title: Schtasks Creation Or Modification With SYSTEM Privileges
|
|
id: 89ca78fd-b37c-4310-b3d3-81a023f83936
|
|
status: experimental
|
|
description: Detects the creation or update of a scheduled task to run with "NT AUTHORITY\SYSTEM" privileges
|
|
references:
|
|
- https://www.elastic.co/security-labs/exploring-the-qbot-attack-pattern
|
|
- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/schtasks
|
|
author: Nasreddine Bencherchali (Nextron Systems)
|
|
date: 2022/07/28
|
|
modified: 2023/03/14
|
|
tags:
|
|
- attack.execution
|
|
- attack.persistence
|
|
- attack.t1053.005
|
|
logsource:
|
|
product: windows
|
|
category: process_creation
|
|
detection:
|
|
selection_root:
|
|
Image|endswith: '\schtasks.exe'
|
|
CommandLine|contains:
|
|
- ' /change '
|
|
- ' /create '
|
|
selection_run:
|
|
CommandLine|contains: '/ru '
|
|
selection_user:
|
|
CommandLine|contains:
|
|
- 'NT AUT' # This covers the usual NT AUTHORITY\SYSTEM
|
|
- ' SYSTEM ' # SYSTEM is a valid value for schtasks hence it gets it's own value with space
|
|
filter_teamviewer:
|
|
# FP from test set in SIGMA
|
|
ParentImage|contains|all:
|
|
- '\AppData\Local\Temp\'
|
|
- 'TeamViewer_.exe'
|
|
Image|endswith: '\schtasks.exe'
|
|
CommandLine|contains: '/TN TVInstallRestore'
|
|
filter_avira:
|
|
CommandLine|contains:
|
|
- '/Create /F /RU System /SC WEEKLY /TN AviraSystemSpeedupVerify /TR '
|
|
- 'C:\Program Files (x86)\Avira\System Speedup\setup\avira_speedup_setup.exe'
|
|
- '/VERIFY /VERYSILENT /NOSTART /NODOTNET /NORESTART" /RL HIGHEST'
|
|
condition: all of selection_* and not 1 of filter_*
|
|
falsepositives:
|
|
- Unknown
|
|
level: high
|