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https://github.com/splunk/security_content
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Gowthamaraj rajendran
69 lines
2.9 KiB
YAML
69 lines
2.9 KiB
YAML
name: Disable Schedule Task
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id: db596056-3019-11ec-a9ff-acde48001122
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version: 1
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date: '2021-10-18'
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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: This analytic is to detect a suspicious commandline to disable existing
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schedule task. This technique is used by adversaries or commodity malware like IcedID
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to disable security application (AV products) in the targetted host to evade detections.
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This TTP is a good pivot to check further why and what other process run before
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and after this detection. check which process execute the commandline and what task
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is disabled. parent child process is quite valuable in this scenario too.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime
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max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=schtasks.exe
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Processes.process=*/change* Processes.process=*/disable* by Processes.user Processes.process_name
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Processes.process Processes.parent_process_name Processes.parent_process Processes.dest
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `disable_schedule_task_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: admin may disable problematic schedule task
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references:
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- https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
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tags:
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analytic_story:
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- IcedID
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- Living Off The Land
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asset_type: Endpoint
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confidence: 80
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impact: 70
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message: schtask process with commandline $process$ to disable schedule task in
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$dest$
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mitre_attack_id:
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- T1562.001
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- T1562
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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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- _time
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- Processes.user
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- Processes.process_name
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- Processes.parent_process_name
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- Processes.dest
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risk_score: 56
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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: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_schtask/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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