Sigma rule: Add Port Monitor Persistence in Registry

Rule

Title

Add Port Monitor Persistence in Registry

Status

test

Level

medium

Author

frack113

Date

2021-12-30

Modified

2024-03-25

File

rules/windows/registry/registry_set/registry_set_add_port_monitor.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Adversaries may use port monitors to run an attacker supplied DLL during system boot for persistence or privilege escalation.
A port monitor can be set through the AddMonitor API call to set a DLL to be loaded at startup.

Log source

product

windows

category

registry_set

Detection

selection:
    TargetObject|contains: '\Control\Print\Monitors\'
    Details|endswith: '.dll'
filter_optional_cutepdf:
    Image: 'C:\Windows\System32\spoolsv.exe'
    TargetObject|contains: '\Control\Print\Monitors\CutePDF Writer Monitor v4.0\Driver'
    Details: 'cpwmon64_v40.dll'
    User|contains: # covers many language settings
        - 'AUTHORI'
        - 'AUTORI'
filter_optional_monvnc:
    TargetObject|contains: '\Control\Print\Monitors\MONVNC\Driver'
filter_optional_vnc:
    TargetObject|contains|all:
        - 'Control\Print\Environments\'
        - '\Drivers\'
        - '\VNC Printer'
condition: selection and not 1 of filter_optional_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.privilege-escalation
• attack.persistence
• attack.t1547.010

MITRE ATT&CK ids this rule names

• T1547.010

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.010/T1547.010.md

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_add_port_monitor.yml