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P4T12ICK
76 lines
2.6 KiB
YAML
76 lines
2.6 KiB
YAML
name: Excessive Usage Of Taskkill
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id: fe5bca48-accb-11eb-a67c-acde48001122
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version: 1
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date: '2021-05-04'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: This analytic identifies excessive usage of `taskkill.exe` application.
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This application is commonly used by adversaries to evade detections by killing
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security product processes or even other processes to evade detection.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` values(Processes.process) as process
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values(Processes.process_id) as process_id count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name = "taskkill.exe" by
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Processes.parent_process_name Processes.process_name Processes.dest Processes.user
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_time span=1m | where count >=10 | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `excessive_usage_of_taskkill_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. Tune and filter known instances where renamed taskkill.exe may be used.
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known_false_positives: Unknown. Filter as needed.
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references:
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- https://thedfirreport.com/2020/04/20/sqlserver-or-the-miner-in-the-basement/
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- https://www.joesandbox.com/analysis/702680/0/html
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tags:
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analytic_story:
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- XMRig
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- Azorult
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- CISA AA22-264A
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- AgentTesla
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- CISA AA22-277A
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asset_type: Endpoint
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confidence: 70
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impact: 40
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message: Excessive usage of taskkill.exe with process id $process_id$ (more than
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10 within 1m) has been detected on $dest$ with a parent process of $parent_process_name$.
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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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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: parent_process_name
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type: Process Name
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role:
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- Parent Process
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- Attacker
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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.parent_process_name
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- Processes.process_name
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- Processes.dest
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- Processes.user
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- Processes.process
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- Processes.process_id
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risk_score: 28
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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/xmrig_miner/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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