mirror of
https://github.com/splunk/security_content
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Bhavin Patel
73 lines
3.1 KiB
YAML
73 lines
3.1 KiB
YAML
name: Office Document Creating Schedule Task
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id: cc8b7b74-9d0f-11eb-8342-acde48001122
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version: 7
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date: '2024-05-16'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects an Office document creating a scheduled
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task, either through a macro VBA API or by loading `taskschd.dll`. This detection
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leverages Sysmon EventCode 7 to identify when Office applications load the `taskschd.dll`
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file. This activity is significant as it is a common technique used by malicious
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macro malware to establish persistence or initiate beaconing. If confirmed malicious,
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this could allow an attacker to maintain persistence, execute arbitrary commands,
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or schedule future malicious activities, posing a significant threat to the environment.
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data_source:
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- Sysmon EventID 7
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search: '`sysmon` EventCode=7 process_name IN ("WINWORD.EXE", "EXCEL.EXE", "POWERPNT.EXE","onenote.exe","onenotem.exe","onenoteviewer.exe","onenoteim.exe",
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"msaccess.exe") loaded_file_path = "*\\taskschd.dll" | stats min(_time) as firstTime
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max(_time) as lastTime count by user_id, dest, process_name,loaded_file, loaded_file_path,
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original_file_name, process_guid | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `office_document_creating_schedule_task_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name and ImageLoaded (Like sysmon EventCode 7) from your endpoints.
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If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
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Also be sure to include those monitored dll to your own sysmon config.
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known_false_positives: False positives may occur if legitimate office documents are
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creating scheduled tasks. Ensure to investigate the scheduled task and the command
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to be executed. If the task is benign, add the task name to the exclusion list.
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Some applications may legitimately load taskschd.dll.
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references:
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- https://research.checkpoint.com/2021/irans-apt34-returns-with-an-updated-arsenal/
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- https://redcanary.com/threat-detection-report/techniques/scheduled-task-job/
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- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/trojanized-onenote-document-leads-to-formbook-malware/
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tags:
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analytic_story:
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- Spearphishing Attachments
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: An Office document was identified creating a scheduled task on $dest$.
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Investigate further.
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mitre_attack_id:
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- T1566
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- T1566.001
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- ImageLoaded
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- AllImageLoaded
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- dest
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- EventCode
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- Image
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- process_name
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- ProcessId
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- ProcessGuid
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- _time
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risk_score: 49
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/datasets/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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