splunk-security_content/docs/_posts/2019-12-06-create_remote_thread_into_lsass.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Create Remote Thread into LSASS	LSASS Memory, OS Credential Dumping	Endpoint	2019-12-06	true		LSASS Memory Credential Access OS Credential Dumping Credential Access Splunk Enterprise Splunk Enterprise Security Splunk Cloud

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Description

Detect remote thread creation into LSASS consistent with credential dumping.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel:
• Last Updated: 2019-12-06
• Author: Patrick Bareiss, Splunk
• ID: 67d4dbef-9564-4699-8da8-03a151529edc

ATT&CK

ID	Technique	Tactic
T1003.001	LSASS Memory	Credential Access

| T1003 | OS Credential Dumping | Credential Access |

Search

`sysmon` EventID=8 TargetImage=*lsass.exe 
| stats count min(_time) as firstTime max(_time) as lastTime by Computer, EventCode, TargetImage, TargetProcessId 
| rename Computer as dest 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `create_remote_thread_into_lsass_filter`

Associated Analytic Story

• Credential Dumping

How To Implement

This search needs Sysmon Logs with a Sysmon configuration, which includes EventCode 8 with lsass.exe. This search uses an input macro named sysmon. We strongly recommend that you specify your environment-specific configurations (index, source, sourcetype, etc.) for Windows Sysmon logs. Replace the macro definition with configurations for your Splunk environment. The search also uses a post-filter macro designed to filter out known false positives.

Required field

• _time
• EventID
• TargetImage
• Computer
• EventCode
• TargetImage
• TargetProcessId
• dest

Kill Chain Phase

• Actions on Objectives

Known False Positives

Other tools can access LSASS for legitimate reasons and generate an event. In these cases, tweaking the search may help eliminate noise.

RBA

Risk Score	Impact	Confidence	Message
81.0	90	90	A process has created a remote thread into TargetImage on dest. This behavior is indicative of credential dumping and should be investigated.

Reference

• https://2017.zeronights.org/wp-content/uploads/materials/ZN17_Kheirkhabarov_Hunting_for_Credentials_Dumping_in_Windows_Environment.pdf

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.001/atomic_red_team/windows-sysmon.log

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