Linux Suspicious GCC Invocation Building Init Shared Object

name: Linux Suspicious GCC Invocation Building Init Shared Object
id: 9dbf4a61-0493-43bd-932c-532ba7671a7a
version: 1
creation_date: '2026-07-08'
modification_date: '2026-07-08'
author: Raven Tait, Splunk
status: production
type: TTP
description: |-
    The following analytic detects compiler usage with flags commonly used to create shared libraries that auto-run initialization functions, which are often associated with local privilege escalation exploits.
data_source:
    - Sysmon for Linux EventID 1
search: |-
    | tstats `security_content_summariesonly`
      count min(_time) as firstTime max(_time) as lastTime

    FROM datamodel=Endpoint.Processes WHERE

    Processes.process_name IN (
        "*x86_64-linux-gnu-gcc*",
        "cc",
        "g++",
        "gcc-*",
        "gcc"
    )
    Processes.process="*-shared*"
    Processes.process="*-Wl,-init,*"
    Processes.process="*.so*"

    BY Processes.action Processes.dest Processes.original_file_name
       Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
       Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
       Processes.process Processes.process_current_directory Processes.process_exec
       Processes.process_guid Processes.process_hash Processes.process_id
       Processes.process_integrity_level Processes.process_name Processes.process_path
       Processes.user Processes.user_id Processes.vendor_product

    | `drop_dm_object_name(Processes)`
    | `security_content_ctime(firstTime)`
    | `security_content_ctime(lastTime)`
    | `linux_suspicious_gcc_invocation_building_init_shared_object_filter`
how_to_implement: |-
    The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process.
known_false_positives: |-
    Legitimate developers may use these GCC flags when building shared libraries that require initialization functions. Filter based on known development environments and trusted users.
references:
    - https://www.bleepingcomputer.com/news/security/cisa-warns-of-critical-linux-sudo-flaw-exploited-in-attacks/
    - https://github.com/pr0v3rbs/CVE-2025-32463_chwoot
drilldown_searches:
    - earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
      name: View the detection results for - "$user$" and "$dest$"
      search: '%original_detection_search% | search  user = "$user$" dest = "$dest$"'
    - name: View risk events for the last 7 days for - "$user$" and "$dest$"
      search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$", "$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
      earliest_offset: 7d
      latest_offset: '0'
finding:
    title: Suspicious GCC Invocation Building Init Shared Object identified on [$dest$] via [$process_name$] with the Command Line [$process$]
    entity:
        field: dest
        type: system
        score: 50
threat_objects:
    - field: process_name
      type: process_name
    - field: process
      type: process
analytic_story:
    - Linux Privilege Escalation
    - Linux Post-Exploitation
    - Linux Persistence Techniques
asset_type: Endpoint
cve:
    - CVE-2025-32463
mitre_attack_id:
    - T1129
    - T1068
    - T1608
    - T1027.004
product:
    - Splunk Enterprise
    - Splunk Enterprise Security
    - Splunk Cloud
category: endpoint
security_domain: endpoint
tests:
    - name: True Positive Test
      test_type: unit
      attack_data:
        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1129/linux_suspicious_gcc_invocation_building_init_shared_object/snapattack_linux.log
          source: Syslog:Linux-Sysmon/Operational
          sourcetype: sysmon:linux