mirror of
https://github.com/splunk/security_content
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Bhavin Patel
72 lines
2.7 KiB
YAML
72 lines
2.7 KiB
YAML
name: Linux Deletion Of Init Daemon Script
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id: 729aab57-d26f-4156-b97f-ab8dda8f44b1
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version: 3
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date: '2024-05-18'
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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: The following analytic detects the deletion of init daemon scripts on
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a Linux machine. It leverages filesystem event logs to identify when files within
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the /etc/init.d/ directory are deleted. This activity is significant because init
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daemon scripts control the start and stop of critical services, and their deletion
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can indicate an attempt to impair security features or evade defenses. If confirmed
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malicious, this behavior could allow an attacker to disrupt essential services,
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execute destructive payloads, or persist undetected in the environment.
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data_source:
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- Sysmon for Linux EventID 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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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`| `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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- Data Destruction
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: Init daemon script deleted on host $dest$ by process GUID- $process_guid$
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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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- name: file_name
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type: File Name
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role:
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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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- 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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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:
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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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