Detection rules › Sigma
Suspicious Scheduled Task Update
Detects update to a scheduled task event that contain suspicious keywords.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1053.005 Scheduled Task/Job: Scheduled Task |
| Persistence | T1053.005 Scheduled Task/Job: Scheduled Task |
| Privilege Escalation | T1053.005 Scheduled Task/Job: Scheduled Task |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4702 | A scheduled task was updated. |
Rule body yaml
title: Suspicious Scheduled Task Update
id: 614cf376-6651-47c4-9dcc-6b9527f749f4
related:
- id: 1c0e41cd-21bb-4433-9acc-4a2cd6367b9b # ProcCreation schtasks change
type: similar
status: test
description: Detects update to a scheduled task event that contain suspicious keywords.
references:
- https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4698
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-05
tags:
- attack.execution
- attack.privilege-escalation
- attack.persistence
- attack.t1053.005
logsource:
product: windows
service: security
definition: 'The Advanced Audit Policy setting Object Access > Audit Other Object Access Events has to be configured to allow this detection. We also recommend extracting the Command field from the embedded XML in the event data.'
detection:
selection_eid:
EventID: 4702
selection_paths:
TaskContentNew|contains:
- '\AppData\Local\Temp\'
- '\AppData\Roaming\'
- '\Users\Public\'
- '\WINDOWS\Temp\'
- 'C:\Temp\'
- '\Desktop\'
- '\Downloads\'
- '\Temporary Internet'
- 'C:\ProgramData\'
- 'C:\Perflogs\'
selection_commands:
TaskContentNew|contains:
- 'regsvr32'
- 'rundll32'
- 'cmd.exe</Command>'
- 'cmd</Command>'
- '<Arguments>/c '
- '<Arguments>/k '
- '<Arguments>/r '
- 'powershell'
- 'pwsh'
- 'mshta'
- 'wscript'
- 'cscript'
- 'certutil'
- 'bitsadmin'
- 'bash.exe'
- 'bash '
- 'scrcons'
- 'wmic '
- 'wmic.exe'
- 'forfiles'
- 'scriptrunner'
- 'hh.exe'
condition: all of selection_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_eid
selection_eid:
EventID: 4702
Stage 2: selection_paths
selection_paths:
TaskContentNew|contains:
- '\AppData\Local\Temp\'
- '\AppData\Roaming\'
- '\Users\Public\'
- '\WINDOWS\Temp\'
- 'C:\Temp\'
- '\Desktop\'
- '\Downloads\'
- '\Temporary Internet'
- 'C:\ProgramData\'
- 'C:\Perflogs\'
Stage 3: selection_commands
selection_commands:
TaskContentNew|contains:
- 'regsvr32'
- 'rundll32'
- 'cmd.exe</Command>'
- 'cmd</Command>'
- '<Arguments>/c '
- '<Arguments>/k '
- '<Arguments>/r '
- 'powershell'
- 'pwsh'
- 'mshta'
- 'wscript'
- 'cscript'
- 'certutil'
- 'bitsadmin'
- 'bash.exe'
- 'bash '
- 'scrcons'
- 'wmic '
- 'wmic.exe'
- 'forfiles'
- 'scriptrunner'
- 'hh.exe'
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 |
|---|---|---|
TaskContentNew | match |
|