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P4T12ICK
85 lines
3.6 KiB
YAML
85 lines
3.6 KiB
YAML
name: Linux Deletion Of Init Daemon Script
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id: 729aab57-d26f-4156-b97f-ab8dda8f44b1
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version: 1
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date: '2022-04-12'
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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 deletion of init daemon script in a linux
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machine. daemon script that place in /etc/init.d/ is a directory that can start
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and stop some daemon services in linux machines. attacker may delete or modify daemon
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script to impair some security features or act as defense evasion in a compromised
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linux machine. This TTP can be also a good indicator of a malware trying to wipe
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or delete several files in compromised host as part of its destructive payload like
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what acidrain malware does in linux or router machines. This detection can be a
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good pivot to check what process and user tries to delete this type of files which
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is not so common and need further investigation.
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data_source:
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- Sysmon Event ID 11
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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.Filesystem where Filesystem.action=deleted Filesystem.file_path
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IN ( "/etc/init.d/*") by _time span=1h Filesystem.file_name Filesystem.file_path
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Filesystem.dest Filesystem.process_guid Filesystem.action | `drop_dm_object_name(Filesystem)`
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|rename process_guid as proc_guid |join proc_guid, _time [ | tstats `security_content_summariesonly`
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count FROM datamodel=Endpoint.Processes where Processes.parent_process_name != unknown
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by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest
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Processes.parent_process_name Processes.parent_process Processes.process_path Processes.process_guid
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| `drop_dm_object_name(Processes)` |rename process_guid as proc_guid | fields _time
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dest user parent_process_name parent_process process_name process_path process proc_guid
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registry_path registry_value_name registry_value_data registry_key_name action]
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| table process_name process proc_guid file_name file_path action _time parent_process_name
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parent_process process_path dest user | `linux_deletion_of_init_daemon_script_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://www.sentinelone.com/labs/acidrain-a-modem-wiper-rains-down-on-europe/
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tags:
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analytic_story:
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- AcidRain
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asset_type: endpoint
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confidence: 70
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impact: 70
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message: a $process_name$ deleting a daemon script in $dest$
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mitre_attack_id:
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- T1485
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- T1070.004
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- T1070
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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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- Filesystem.dest
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- Filesystem.file_create_time
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- Filesystem.file_name
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- Filesystem.process_guid
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- Filesystem.file_path
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- Filesystem.action
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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.parent_process
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- Processes.process_name
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- Processes.process_path
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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: 49
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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/acidrain/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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