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pyth0n1c
66 lines
2.4 KiB
YAML
66 lines
2.4 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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type: TTP
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datamodel:
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- Endpoint
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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 IceID
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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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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: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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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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confidence: 80
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/disable_schtask/sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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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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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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