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P4T12ICK
67 lines
2.6 KiB
YAML
67 lines
2.6 KiB
YAML
name: Linux Edit Cron Table Parameter
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id: 0d370304-5f26-11ec-a4bb-acde48001122
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version: 1
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date: '2021-12-17'
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author: Teoderick Contreras, Splunk
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status: production
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type: Hunting
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description: The following analytic identifies a suspicious cronjobs modification
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using crontab edit parameter. This commandline parameter can be abuse by malware
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author, adversaries, and red red teamers to add cronjob entry to their malicious
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code to execute to the schedule they want. This event can also be executed by administrator
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or normal user for automation purposes so filter is needed.
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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 = crontab
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Processes.process = "*crontab *" Processes.process = "* -e*" by Processes.dest Processes.user
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Processes.parent_process_name Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `linux_edit_cron_table_parameter_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 use this application
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for automation purposes. Please update the filter macros to remove false positives.
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references:
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- https://attack.mitre.org/techniques/T1053/003/
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tags:
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analytic_story:
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- Linux Privilege Escalation
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- Linux Persistence Techniques
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- Linux Living Off The Land
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asset_type: Endpoint
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confidence: 30
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impact: 30
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message: A possible crontab edit command $process$ executed on $dest$
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mitre_attack_id:
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- T1053.003
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- T1053
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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: 9
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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/T1053.003/crontab_edit_parameter/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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