Linux System Information Discovery via Getconf

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Linux System Information Discovery via Getconf

This rule identifies Linux system information discovery via the "getconf" command. The "getconf" command is used to query system configuration variables and system limits. Adversaries may use this command to gather information about the system, such as the page size, maximum number of open files, and other system limits, to aid in further exploration and exploitation of the system.

Rule type: new_terms

Rule indices:

logs-endpoint.events.process*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://blog.exatrack.com/Perfctl-using-portainer-and-new-persistences/

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Discovery
Rule Type: BBR
Data Source: Elastic Defend

Version: 5

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

event.category:process and host.os.type:linux and event.type:start and event.action:exec and process.name:getconf and not (
  process.parent.executable:(
    "/usr/bin/google_guest_agent_manager" or "/opt/commvault/Base64/cvlaunchd" or /usr/local/manageengine/uems_agent/bin/*
  ) or
  process.working_directory:(
    "/opt/oracle/mgmt_agent/agent_inst/bin" or "/var/lib/oracle-cloud-agent/plugins/oci-managementagent/polaris" or
    "/opt/commvault/Base/cvlaunchd" or "/opt/simpana" or "/opt/commvault" or "/opt/ITSPlatform/agentcore" or
    "/u01/app/oracle/EMBase/agent_inst/sysman/emd" or "/opt/abacus/lib"
  ) or
  process.parent.args:(
    /opt/oracle/mgmt_agent/agent_inst/* or "/opt/datadog-agent/bin/agent/agent" or "/usr/bin/byobu-status" or
    "/usr/local/nagios/libexec/check_ssl_cert" or "/usr/lib64/nagios/plugins/cpanel/check_ssl_cert"
  ) or
  process.parent.command_line:(
    "/bin/sh -s unix:cmd" or "ruby /usr/local/bundle/bin/bundle exec rackup"
  )
)

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: System Information Discovery
- ID: T1082
- Reference URL: https://attack.mitre.org/techniques/T1082/

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