Privilege Escalation via Rogue Named Pipe Impersonation
editPrivilege Escalation via Rogue Named Pipe Impersonation
editIdentifies a privilege escalation attempt via rogue named pipe impersonation. An adversary may abuse this technique by masquerading as a known named pipe and manipulating a privileged process to connect to it.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-windows.sysmon_operational-*
Severity: high
Risk score: 73
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Privilege Escalation
- Data Source: Sysmon
Version: 106
Rule authors:
- Elastic
Rule license: Elastic License v2
Setup
editSetup
Named Pipe Creation Events need to be enabled within the Sysmon configuration by including the following settings:
condition equal "contains" and keyword equal "pipe"
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 version 8.2.
Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
event.ingested to @timestamp.
For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
Rule query
editfile where host.os.type == "windows" and event.action : "Pipe Created*" and /* normal sysmon named pipe creation events truncate the pipe keyword */ file.name : "\\*\\Pipe\\*"
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Access Token Manipulation
- ID: T1134
- Reference URL: https://attack.mitre.org/techniques/T1134/