Persistence via Microsoft Office AddIns
editPersistence via Microsoft Office AddIns
editDetects attempts to establish persistence on an endpoint by abusing Microsoft Office add-ins.
Rule type: eql
Rule indices:
- logs-endpoint.events.file-*
- winlogbeat-*
- 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: Persistence
- Data Source: Elastic Endgame
- 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 != "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&CKTM
-
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/
-
Sub-technique:
- Name: Add-ins
- ID: T1137.006
- Reference URL: https://attack.mitre.org/techniques/T1137/006/