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Persistence via Microsoft Office AddIns

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Persistence via Microsoft Office AddIns

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Detects attempts to establish persistence on an endpoint by abusing Microsoft Office add-ins.

Rule type: eql

Rule indices:

logs-endpoint.events.*
winlogbeat-*
logs-windows.*
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:

https://labs.mwrinfosecurity.com/blog/add-in-opportunities-for-office-persistence/

Tags:

Elastic
Host
Windows
Threat Detection
Persistence
Elastic Endgame

Version: 102

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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file where host.os.type == "windows" and event.type != "deletion" and
 file.extension : ("wll","xll","ppa","ppam","xla","xlam") and
 file.path :
    (
    "C:\\Users\\*\\AppData\\Roaming\\Microsoft\\Word\\Startup\\*",
    "C:\\Users\\*\\AppData\\Roaming\\Microsoft\\AddIns\\*",
    "C:\\Users\\*\\AppData\\Roaming\\Microsoft\\Excel\\XLSTART\\*"
    )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Office Application Startup
- ID: T1137
- Reference URL: https://attack.mitre.org/techniques/T1137/

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