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windows_valid_account_with_never_expires_password.yml
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windows_valid_account_with_never_expires_password.yml
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name: Windows Valid Account With Never Expires Password
id: 73a931db-1830-48b3-8296-cd9cfa09c3c8
version: 1
date: '2022-06-23'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: The following analytic identifies net.exe updating user account policies
for password requirement with non-expiring password. This technique was seen in
several adversaries and malware like Azorult to maintain the foothold (persistence),
gaining privilege escalation, defense evasion and possible for lateral movement
for specific users or created user account on the targeted host. This TTP detections
is a good pivot to see further what other events that users executes on the machines.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` values(Processes.process) as process
min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
where `process_net` AND Processes.process="* accounts *" AND Processes.process="*
/maxpwage:unlimited" by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id
| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
| `windows_valid_account_with_never_expires_password_filter`'
how_to_implement: The detection is based on data that originates from Endpoint Detection
and Response (EDR) agents. These agents are designed to provide security-related
telemetry from the endpoints where the agent is installed. To implement this search,
you must ingest logs that contain the process GUID, process name, and parent process.
Additionally, you must ingest complete command-line executions. These logs must
be processed using the appropriate Splunk Technology Add-ons that are specific to
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
data model. Use the Splunk Common Information Model (CIM) to normalize the field
names and speed up the data modeling process.
known_false_positives: This behavior is not commonly seen in production environment
and not advisable, filter as needed.
references:
- https://app.any.run/tasks/a6f2ffe2-e6e2-4396-ae2e-04ea0143f2d8/
- https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/net-commands-on-operating-systems
tags:
analytic_story:
- Azorult
asset_type: Endpoint
confidence: 100
impact: 100
message: An instance of $parent_process_name$ spawning $process_name$ was identified
on endpoint $dest$ attempting to make non-expiring password on host user accounts.
mitre_attack_id:
- T1489
observable:
- name: dest
type: Endpoint
role:
- Victim
product:
- Splunk Enterprise
- Splunk Enterprise Security
- Splunk Cloud
required_fields:
- _time
- Processes.dest
- Processes.user
- Processes.parent_process_name
- Processes.parent_process
- Processes.original_file_name
- Processes.process_name
- Processes.process
- Processes.process_id
- Processes.parent_process_path
- Processes.process_path
- Processes.parent_process_id
risk_score: 100
security_domain: endpoint
tests:
- name: True Positive Test
attack_data:
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/azorult/sysmon.log
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
sourcetype: xmlwineventlog
update_timestamp: true