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tccontre
70 lines
2.5 KiB
YAML
70 lines
2.5 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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type: Hunting
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datamodel:
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- Endpoint
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description: The following analytic identifies a suspicious edit cronjobs parameter.
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This commandline parameter can be abuse by malware author, adversaries, and red red teamers to add cronjob entry to their malicious code to execute
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to the schedule they want. This event can also be executed by administrator or normal user for automation purposes so filter is needed.
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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
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where Processes.process_name = crontab Processes.process = "*crontab *" Processes.process = "* -e*"
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by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `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 must have at least version 6.0.4 of the
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Sysmon TA.
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known_false_positives: Administrator or network operator can use this application for automation purposes. filter is needed
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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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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1053.003/crontab_edit_parameter/sysmon_linux.log
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kill_chain_phases:
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- Privilege Escalation
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mitre_attack_id:
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- T1053.003
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- T1053
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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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security_domain: endpoint
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impact: 30
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confidence: 30
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# (impact * confidence)/100
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risk_score: 9
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context:
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- source:endpoint
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- stage:Privilege Escalation Persistence
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message: a possible crontab edit command $process$ executed on $dest$
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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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nist:
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- DE.CM
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16 |