Added detection testing service results inSLUI Spawning a Process

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2021-05-13 20:11:55 +00:00
parent dccb38e877
commit bab3434e54
+23 -17
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@@ -6,28 +6,33 @@ author: Michael Haag, Splunk
type: batch
datamodel:
- Endpoint
description: The following analytic identifies the Microsoft Software Licensing User Interface Tool, `slui.exe`, spawning a child process. This behavior is associated with publicly known UAC bypass.
`slui.exe` is commonly associated with software updates and is most often spawned by `svchost.exe`.
The `slui.exe` process should not have child processes, and any processes spawning from it will be running with elevated privileges.
During triage, review the child process and additional parallel processes. Identify any file modifications that may have lead to the bypass.
description: The following analytic identifies the Microsoft Software Licensing User
Interface Tool, `slui.exe`, spawning a child process. This behavior is associated
with publicly known UAC bypass. `slui.exe` is commonly associated with software
updates and is most often spawned by `svchost.exe`. The `slui.exe` process should
not have child processes, and any processes spawning from it will be running with
elevated privileges. During triage, review the child process and additional parallel
processes. Identify any file modifications that may have lead to the bypass.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=slui.exe by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `slui_spawning_a_process_filter`'
as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=slui.exe
by Processes.dest Processes.user Processes.parent_process Processes.process_name
Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `slui_spawning_a_process_filter`'
how_to_implement: To successfully implement this search you need to be ingesting information
on process that include the name of the process responsible for the changes from
your endpoints into the `Endpoint` datamodel in the `Processes` node.
known_false_positives: Certain applications may spawn from `slui.exe` that are legitimate. Filtering will be needed to ensure proper monitoring.
known_false_positives: Certain applications may spawn from `slui.exe` that are legitimate.
Filtering will be needed to ensure proper monitoring.
references:
- https://www.exploit-db.com/exploits/46998
- https://www.rapid7.com/db/modules/exploit/windows/local/bypassuac_sluihijack/
- https://www.fireeye.com/blog/threat-research/2021/05/shining-a-light-on-darkside-ransomware-operations.html
- https://www.exploit-db.com/exploits/46998
- https://www.rapid7.com/db/modules/exploit/windows/local/bypassuac_sluihijack/
- https://www.fireeye.com/blog/threat-research/2021/05/shining-a-light-on-darkside-ransomware-operations.html
tags:
analytic_story:
- DarkSide Ransomware
- Windows Defense Evasion Tactics
dataset: []
dataset:
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548.002/slui/windows-sysmon.log
kill_chain_phases:
- Exploitation
mitre_attack_id:
@@ -38,11 +43,12 @@ tags:
- Splunk Cloud
required_fields:
- _time
- Processes.dest
- Processes.user
- Processes.dest
- Processes.user
- Processes.parent_process
- Processes.process_name
- Processes.process
- Processes.process_id
- Processes.process_id
- Processes.parent_process_id
security_domain: endpoint
security_domain: endpoint
automated_detection_testing: passed