Suspicious PrintSpooler Service Executable File Creation
editSuspicious PrintSpooler Service Executable File Creation
editDetects attempts to exploit privilege escalation vulnerabilities related to the Print Spooler service. For more information refer to the following CVE’s - CVE-2020-1048, CVE-2020-1337 and CVE-2020-1300 and verify that the impacted system is patched.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.file-*
- logs-windows.sysmon_operational-*
- endgame-*
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: Elastic Endgame
- Use Case: Vulnerability
- Data Source: Elastic Defend
- Data Source: Sysmon
Version: 108
Rule authors:
- Elastic
Rule license: Elastic License v2
Setup
editSetup
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.type == "creation" and process.name : "spoolsv.exe" and file.extension : "dll" and file.path : ("?:\\Windows\\System32\\*", "?:\\Windows\\SysWOW64\\*") and not file.path : ( "?:\\WINDOWS\\SysWOW64\\PrintConfig.dll", "?:\\WINDOWS\\system32\\x5lrs.dll", "?:\\WINDOWS\\sysWOW64\\x5lrs.dll", "?:\\WINDOWS\\system32\\PrintConfig.dll", "?:\\WINDOWS\\system32\\spool\\DRIVERS\\x64\\*.dll", "?:\\WINDOWS\\system32\\spool\\DRIVERS\\W32X86\\*.dll", "?:\\WINDOWS\\system32\\spool\\PRTPROCS\\x64\\*.dll", "?:\\WINDOWS\\system32\\spool\\{????????-????-????-????-????????????}\\*.dll" )
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/