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Description

This search looks for reading lsass memory consistent with credential dumping.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2019-12-03
  • Author: Patrick Bareiss, Splunk
  • ID: 2c365e57-4414-4540-8dc0-73ab10729996

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
  • PR.IP
  • PR.AC
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE
1
2
3
4
5
6
`sysmon` EventCode=10 TargetImage=*lsass.exe (GrantedAccess=0x1010 OR GrantedAccess=0x1410) 
| stats count min(_time) as firstTime max(_time) as lastTime by Computer, SourceImage, SourceProcessId, TargetImage, TargetProcessId, EventCode, GrantedAccess 
| rename Computer as dest 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `detect_credential_dumping_through_lsass_access_filter` 

Macros

The SPL above uses the following Macros:

Note that detect_credential_dumping_through_lsass_access_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
  • EventCode
  • TargetImage
  • GrantedAccess
  • Computer
  • SourceImage
  • SourceProcessId
  • TargetImage
  • TargetProcessId

How To Implement

This search needs Sysmon Logs and a sysmon configuration, which includes EventCode 10 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

The activity may be legitimate. Other tools can access lsass for legitimate reasons, and it’s possible this event could be generated in those cases. In these cases, false positives should be fairly obvious and you may need to tweak the search to eliminate noise.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
80.0 80 100 The $source_image$ has attempted access to read $TargetImage$ was identified on endpoint $Computer$, this is indicative of credential dumping and should be investigated.

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: 3