name: Linux Preload Hijack Library Calls
id: cbe2ca30-631e-11ec-8670-acde48001122
version: 1
date: '2021-12-22'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This analytic is to detect a suspicious command that may hijack a library
  function in linux platform. This technique is commonly abuse by adversaries, malware
  author and red teamers to gain privileges and persist on the machine. This detection
  pertains to loading a dll to hijack or hook a library function of specific program
  using LD_PRELOAD command.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine: '*LD_PRELOAD*'
  condition: selection1
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and command-line executions from your
  endpoints. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
  Splunkbase
known_false_positives: Administrator or network operator can execute this command.
  Please update the filter macros to remove false positives.
references:
- https://compilepeace.medium.com/memory-malware-part-0x2-writing-userland-rootkits-via-ld-preload-30121c8343d5
tags:
  analytic_story:
  - Linux Privilege Escalation
  - Linux Persistence Techniques
  asset_type: Endpoint
  confidence: 80
  impact: 80
  message: A commandline $process$ that may hijack library function on $dest$
  mitre_attack_id:
  - T1574.006
  - T1574
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 64
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1574.006/lib_hijack/sysmon_linux.log
    source: Syslog:Linux-Sysmon/Operational
    sourcetype: sysmon_linux