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Description

The following hunting analytic identifies all processes requesting access into Lsass.exe. his behavior may be related to credential dumping or applications requiring access to credentials. Triaging this event will require understanding the GrantedAccess from the SourceImage. In addition, whether the account is privileged or not. Review the process requesting permissions and review parallel processes.

  • Type: Hunting
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2022-01-12
  • Author: Michael Haag, Splunk
  • ID: 1c6abb08-73d1-11ec-9ca0-acde48001122

ATT&CK

ID Technique Tactic
T1003.001 LSASS Memory Credential Access
T1003 OS Credential Dumping Credential Access
`sysmon` EventCode=10 TargetImage=*lsass.exe 
| stats count min(_time) as firstTime max(_time) as lastTime by Computer, TargetImage, GrantedAccess, SourceImage, SourceProcessId, SourceUser, TargetUser 
| rename Computer as dest 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `windows_hunting_system_account_targeting_lsass_filter`

Associated Analytic Story

How To Implement

To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. Enabling EventCode 10 TargetProcess lsass.exe is required.

Required field

  • _time
  • Computer
  • TargetImage
  • GrantedAccess
  • SourceImage
  • SourceProcessId
  • SourceUser
  • TargetUser

Kill Chain Phase

  • Actions on Objectives

Known False Positives

False positives will occur based on GrantedAccess and SourceUser, filter based on source image as needed.

RBA

Risk Score Impact Confidence Message
64.0 80 80 A process, $SourceImage$, has loaded $ImageLoaded$ that are typically related to credential dumping on $dest$. Review for further details.

Reference

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

source | version: 1