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P4T12ICK
69 lines
2.7 KiB
YAML
69 lines
2.7 KiB
YAML
name: Linux At Application Execution
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id: bf0a378e-5f3c-11ec-a6de-acde48001122
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version: 2
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date: '2022-05-26'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic identifies a suspicious process creation of At
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application. This process can be used by malware, adversaries and red teamers to
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create persistence entry to the targeted or compromised host with their malicious
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code. This anomaly detection can be a good indicator to investigate the event before
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and after this process execution, when it was executed and what schedule task it
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will execute.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count from datamodel=Endpoint.Processes
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where Processes.process_name IN ("at", "atd") OR Processes.parent_process_name
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IN ("at", "atd") 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_at_application_execution_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 into the Endpoint datamodel. If you are using Sysmon, you can use the
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Add-on for Linux Sysmon from 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/T1053/001/
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- https://www.linkedin.com/pulse/getting-attacker-ip-address-from-malicious-linux-job-craig-rowland/
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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: At application was executed in $dest$
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mitre_attack_id:
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- T1053.002
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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/T1053.002/at_execution/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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