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Description

Detect memory dumping of the LSASS process.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2019-12-06
  • Author: Patrick Bareiss, Splunk
  • ID: fb4c31b0-13e8-4155-8aa5-24de4b8d6717

ATT&CK

ID Technique Tactic
T1003.001 LSASS Memory Credential Access
`sysmon` EventCode=10 TargetImage=*lsass.exe CallTrace=*dbgcore.dll* OR CallTrace=*dbghelp.dll* 
| stats count min(_time) as firstTime max(_time) as lastTime by Computer, TargetImage, TargetProcessId, SourceImage, SourceProcessId 
| rename Computer as dest 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `access_lsass_memory_for_dump_creation_filter` 

Associated Analytic Story

How To Implement

This search requires Sysmon Logs and a Sysmon configuration, which includes EventCode 10 for 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
  • EventCode
  • TargetImage
  • CallTrace
  • Computer
  • TargetProcessId
  • SourceImage
  • SourceProcessId

Kill Chain Phase

  • Actions on Objectives

Known False Positives

Administrators can create memory dumps for debugging purposes, but memory dumps of the LSASS process would be unusual.

RBA

Risk Score Impact Confidence Message
63.0 70 90 process $SourceImage$ injected into $TargetImage$ and was attempted dump LSASS on $dest$. Adversaries tend to do this when trying to accesss credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).

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: 2