Elastic Security Detection Rules

Dynamic Linker (ld.so) Creation

Last updated 5 months ago on 2025-03-20
Created 8 months ago on 2024-12-16

About

This rule detects the creation of the dynamic linker (ld.so) file. The dynamic linker is used to load shared libraries needed by an executable. Attackers may attempt to replace the dynamic linker with a malicious version to execute arbitrary code.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: Defense EvasionTactic: ExecutionTactic: PersistenceData Source: Elastic DefendData Source: SentinelOneData Source: Elastic EndgameLanguage: eql
Severity
low
Risk Score
21
MITRE ATT&CK™

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

↳ System Binary Proxy Execution (T1218)(opens in a new tab or window)

Execution (TA0002)(opens in a new tab or window)

↳ Command and Scripting Interpreter (T1059)(opens in a new tab or window)

Persistence (TA0003)(opens in a new tab or window)

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

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

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
logs-endpoint.events.file*logs-sentinel_one_cloud_funnel.*endgame-*
Related Integrations

endpoint(opens in a new tab or window)

sentinel_one_cloud_funnel(opens in a new tab or window)

Query
file where host.os.type == "linux" and event.type == "creation" and process.executable != null and
file.path like~ ("/lib/ld-linux*.so*", "/lib64/ld-linux*.so*", "/usr/lib/ld-linux*.so*", "/usr/lib64/ld-linux*.so*") and
not process.name in ("dockerd", "yum", "dnf", "microdnf", "pacman")

Install detection rules in Elastic Security

Detect Dynamic Linker (ld.so) Creation 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(opens in a new tab or window).