The following query utilizes Windows Security EventCode 4698, A scheduled task was created, to identify suspicious tasks registered on Windows either via schtasks.exe OR TaskService with a hidden settings that are unique entry of malware like industroyer2 or attack that uses lolbin to download other file or payload to the infected machine.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2022-04-26
- Author: Teoderick Contreras, Splunk
- ID: 0b730470-5fe8-4b13-93a7-fe0ad014d0cc
|T1053||Scheduled Task/Job||Execution, Persistence, Privilege Escalation|
Kill Chain Phase
- CIS 3
- CIS 5
- CIS 16
1 2 3 4 5 6 7 `wineventlog_security` EventCode=4698 | xmlkv Message | search Hidden = true | stats count min(_time) as firstTime max(_time) as lastTime by Task_Name, Command, Author, Hidden, dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_hidden_schedule_task_settings_filter`
The SPL above uses the following Macros:
windows_hidden_schedule_task_settings_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
How To Implement
To successfully implement this search, you need to be ingesting logs with the task schedule (Exa. Security Log EventCode 4698) endpoints. Tune and filter known instances of Task schedule used in your environment.
Known False Positives
Associated Analytic story
|64.0||80||80||A schedule task with hidden setting enable in host $dest$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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