Detection rules › Sigma
Suspicious Scheduled Task Name As GUID
Detects creation of a scheduled task with a GUID like name
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 |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Suspicious Scheduled Task Name As GUID
id: ff2fff64-4cd6-4a2b-ba7d-e28a30bbe66b
status: test
description: Detects creation of a scheduled task with a GUID like name
references:
- https://thedfirreport.com/2022/10/31/follina-exploit-leads-to-domain-compromise/
- https://thedfirreport.com/2022/02/21/qbot-and-zerologon-lead-to-full-domain-compromise/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-10-31
tags:
- attack.privilege-escalation
- attack.persistence
- attack.execution
- attack.t1053.005
logsource:
product: windows
category: process_creation
detection:
selection_img:
Image|endswith: '\schtasks.exe'
CommandLine|contains: '/Create '
selection_tn:
CommandLine|contains:
# Can start with single or double quote
- '/TN "{'
- "/TN '{"
- "/TN {"
selection_end:
CommandLine|contains:
# Ending of the name to avoid possible FP in the rest of the commandline
- '}"'
- "}'"
- '} '
condition: all of selection_*
falsepositives:
- Legitimate software naming their tasks as GUIDs
level: medium
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
Image|endswith: '\schtasks.exe'
CommandLine|contains: '/Create '
Stage 2: selection_tn
selection_tn:
CommandLine|contains:
- '/TN "{'
- "/TN '{"
- "/TN {"
Stage 3: selection_end
selection_end:
CommandLine|contains:
- '}"'
- "}'"
- '} '
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 |
|