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Potential Remote Credential Access via Registry

Elastic Stack Serverless Security

Identifies remote access to the registry to potentially dump credential data from the Security Account Manager (SAM) registry hive in preparation for credential access and privileges elevation.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-system.*
  • logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Lateral Movement
  • Credential Access

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

Dumping registry hives is a common way to access credential information. Some hives store credential material,
such as the SAM hive, which stores locally cached credentials (SAM Secrets), and the SECURITY hive, which stores domain
cached credentials (LSA secrets). Dumping these hives in combination with the SYSTEM hive enables the attacker to
decrypt these secrets.

Attackers can use tools like secretsdump.py or CrackMapExec to dump the registry hives remotely, and use dumped
credentials to access other systems in the domain.

  • Identify the target host role, involved account, and source host.
  • Determine the privileges assigned to any compromised accounts.
  • Investigate other alerts related to the involved user and source host in the last 48 hours.
  • Scope potentially compromised accounts. Analysts can do this by searching for login events (e.g., 4624) to the target
    host.
  • False positives for this rule are unlikely. Any activity that triggered the alert and is not inherently malicious must
    be monitored by the security team.
  • Credential Acquisition via Registry Hive Dumping - a7e7bfa3-088e-4f13-b29e-3986e0e756b8
  • Initiate the incident response process based on the outcome of the triage.
  • Isolate the involved hosts to prevent further post-compromise behavior.
  • Scope compromised credentials and disable the accounts.
  • Reset the passwords of compromised accounts.
  • Determine if other hosts were compromised.

This rule uses Elastic Endpoint file creation and System Integration events for correlation. Both data should be
collected from the host for this detection to work.

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.

Rule query

sequence by host.id, user.id with maxspan=1m
 [authentication where
   event.outcome == "success" and
   winlog.logon.type == "Network" and not user.name == "ANONYMOUS LOGON" and
   not user.domain == "NT AUTHORITY" and source.ip != "127.0.0.1" and source.ip !="::1"]
 [file where event.action == "creation" and process.name : "svchost.exe" and
  file.Ext.header_bytes : "72656766*" and user.id : "S-1-5-21-*" and file.size >= 30000]

Framework: MITRE ATT&CKTM