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 OS Credential Dumping Credential Access 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

• Last Updated: 2019-12-06

• Author: Patrick Bareiss, Splunk

• ID: 67d4dbef-9564-4699-8da8-03a151529edc

Annotations

ATT&CK

ID	Technique	Tactic
T1003.001	LSASS Memory	Credential Access

| T1003 | OS Credential Dumping | Credential Access |

Kill Chain Phase

• Actions on Objectives

NIST

• DE.CM

CIS20

• CIS 8
• CIS 16

CVE

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`

Macros

The SPL above uses the following Macros:

• security_content_ctime
• sysmon

ℹ️ create_remote_thread_into_lsass_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

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

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.

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.

Associated Analytic story

• Credential Dumping

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.

ℹ️ The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

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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