Potential Credential Access via DuplicateHandle in LSASS

Identifies suspicious access to an LSASS handle via DuplicateHandle from an unknown call trace module. This may indicate an attempt to bypass the NtOpenProcess API to evade detection and dump LSASS memory for credential access.

Rule type: eql

Rule indices:

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Version: 3 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.2.0

Rule authors: Elastic

Rule license: Elastic License v2

## Config

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.

process where event.code == "10" and /* LSASS requesting
DuplicateHandle access right to another process */ process.name :
"lsass.exe" and winlog.event_data.GrantedAccess == "0x40" and /*
call is coming from an unknown executable region */
winlog.event_data.CallTrace : "*UNKNOWN*"