Dynamic Linker Modification Detected via Defend for Containers

Last updated 23 days ago on 2026-01-15

Created 3 years ago on 2023-06-06

About

This rule detects the creation or modification of the dynamic linker preload shared object (ld.so.preload) inside a container. The Linux dynamic linker is used to load libraries needed by a program at runtime. Adversaries may hijack the dynamic linker by modifying the /etc/ld.so.preload file to point to malicious libraries. This behavior can be used to grant unauthorized access to system resources and has been used to evade detection of malicious processes in container environments.

Tags

Data Source: Elastic Defend for ContainersDomain: ContainerOS: LinuxUse Case: Threat DetectionTactic: Defense EvasionLanguage: eql

Severity

high

Risk Score

MITRE ATT&CK™

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ Hijack Execution Flow (T1574)(external, opens in a new tab or window)

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: Event Correlation Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-cloud_defend.file*
Related Integrations: cloud_defend(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗file where host.os.type == "linux" and event.type != "deletion" and
file.path like ("/etc/ld.so.preload", "/etc/ld.so.conf.d/*", "/etc/ld.so.conf") and
process.interactive == true and container.id like "*"

Install detection rules in Elastic Security

Detect Dynamic Linker Modification Detected via Defend for Containers in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).