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tccontre
66 lines
2.5 KiB
YAML
66 lines
2.5 KiB
YAML
name: Linux DD File Overwrite
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id: 9b6aae5e-8d85-11ec-b2ae-acde48001122
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version: 1
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date: '2023-04-14'
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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 look for dd command to overwrite file. This technique
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was abused by adversaries or threat actor to destroy files or data on specific system
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or in a large number of host within network to interrupt host avilability, services
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and many more. This is also used to destroy data where it make the file irrecoverable
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by forensic techniques through overwriting files, data or local and remote drives.
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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 max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name = "dd"
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AND Processes.process = "*of=*" by Processes.dest Processes.user Processes.parent_process_name
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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Processes.process_guid | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `linux_dd_file_overwrite_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 can use the Add-on for Linux Sysmon from
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Splunkbase.
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known_false_positives: Administrator or network operator can execute this command.
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Please update the filter macros to remove false positives.
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references:
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- https://gtfobins.github.io/gtfobins/dd/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1485/T1485.md
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tags:
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analytic_story:
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- Data Destruction
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- Industroyer2
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asset_type: endpoint
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confidence: 80
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impact: 80
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message: A commandline $process$ executed on $dest$
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mitre_attack_id:
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- T1485
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observable:
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- name: dest
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type: Hostname
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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.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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risk_score: 64
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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/attack_techniques/T1485/linux_dd_file_overwrite/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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