Detection rules › Sigma
Schtasks From Suspicious Folders
Detects scheduled task creations that have suspicious action command and folder combinations
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 |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: Schtasks From Suspicious Folders
id: 8a8379b8-780b-4dbf-b1e9-31c8d112fefb
status: test
description: Detects scheduled task creations that have suspicious action command and folder combinations
references:
- https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/lazarus-dream-job-chemical
author: Florian Roth (Nextron Systems)
date: 2022-04-15
modified: 2022-11-18
tags:
- attack.privilege-escalation
- attack.persistence
- attack.execution
- attack.t1053.005
logsource:
product: windows
category: process_creation
detection:
selection_img:
- Image|endswith: '\schtasks.exe'
- OriginalFileName: 'schtasks.exe'
selection_create:
CommandLine|contains: ' /create '
selection_command:
CommandLine|contains:
- 'powershell'
- 'pwsh'
- 'cmd /c '
- 'cmd /k '
- 'cmd /r '
- 'cmd.exe /c '
- 'cmd.exe /k '
- 'cmd.exe /r '
selection_all_folders:
CommandLine|contains:
- 'C:\ProgramData\'
- '%ProgramData%'
condition: all of selection_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith: '\schtasks.exe'
- OriginalFileName: 'schtasks.exe'
Stage 2: selection_create
selection_create:
CommandLine|contains: ' /create '
Stage 3: selection_command
selection_command:
CommandLine|contains:
- 'powershell'
- 'pwsh'
- 'cmd /c '
- 'cmd /k '
- 'cmd /r '
- 'cmd.exe /c '
- 'cmd.exe /k '
- 'cmd.exe /r '
Stage 4: selection_all_folders
selection_all_folders:
CommandLine|contains:
- 'C:\ProgramData\'
- '%ProgramData%'
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 |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
OriginalFileName | eq |
|