Potential Port Monitor or Print Processor Registration Abuse
editPotential Port Monitor or Print Processor Registration Abuse
editIdentifies port monitor and print processor registry modifications. Adversaries may abuse port monitor and print processors to run malicious DLLs during system boot that will be executed as SYSTEM for privilege escalation and/or persistence, if permissions allow writing a fully-qualified pathname for that DLL.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
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:
- Elastic
- Host
- Windows
- Threat Detection
- Privilege Escalation
Version: 2 (version history)
Added (Elastic Stack release): 7.12.0
Last modified (Elastic Stack release): 8.1.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule query
editregistry where event.type in ("creation", "change") and
registry.path :
("HKLM\\SYSTEM\\*ControlSet*\\Control\\Print\\Monitors\\*", "HKLM\
\SYSTEM\\*ControlSet*\\Control\\Print\\Environments\\Windows*\\Print
Processors\\*") and registry.data.strings : "*.dll" and /* exclude
SYSTEM SID - look for changes by non-SYSTEM user */ not user.id :
"S-1-5-18"
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Boot or Logon Autostart Execution
- ID: T1547
- Reference URL: https://attack.mitre.org/techniques/T1547/
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Boot or Logon Autostart Execution
- ID: T1547
- Reference URL: https://attack.mitre.org/techniques/T1547/
Rule version history
edit- Version 2 (8.1.0 release)
-
-
Updated query, changed from:
registry where event.type in ("creation", "change") and registry.path : ("HKLM\\SYSTEM\\*ControlSet*\\Control\\Print\\Monitors\\*", "HLLM\ \SYSTEM\\*ControlSet*\\Control\\Print\\Environments\\Windows*\\Print Processors\\*") and registry.data.strings : "*.dll" and /* exclude SYSTEM SID - look for changes by non-SYSTEM user */ not user.id : "S-1-5-18"
-