Detectionmediumtest

Suspicious Driver Install by pnputil.exe

Detects when a possible suspicious driver is being installed via pnputil.exe lolbin

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Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Hai Vaknin, Avihay eldad, Austin SongerCreated Thu Sep 30Updated Sun Oct 09a2ea3ae7-d3d0-40a0-a55c-25a45c87cac1windows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection:
        CommandLine|contains:
            - '-i'
            - '/install'
            - '-a'
            - '/add-driver'
            - '.inf'
        Image|endswith: '\pnputil.exe'
    condition: selection

False Positives

Pnputil.exe being used may be performed by a system administrator.

Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.

Pnputil.exe being executed from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

References

MITRE ATT&CK

Tactics

TA0004 · Privilege Escalation TA0003 · Persistence

Techniques

T1547 · Boot or Logon Autostart Execution

Rule Metadata

Rule ID