Elastic Security Detection Rules

Dynamic Linker Copy

Last updated 5 months ago on 2025-03-20
Created 3 years ago on 2022-07-12

About

Detects the copying of the Linux dynamic loader binary and subsequent file creation for the purpose of creating a backup copy. This technique was seen recently being utilized by Linux malware prior to patching the dynamic loader in order to inject and preload a malicious shared object file. This activity should never occur and if it does then it should be considered highly suspicious or malicious.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: PersistenceThreat: OrbitData Source: Elastic DefendData Source: SentinelOneLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

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-endpoint.events.process*logs-sentinel_one_cloud_funnel.*
Related Integrations

endpoint(opens in a new tab or window)

sentinel_one_cloud_funnel(opens in a new tab or window)

Query
sequence by process.entity_id with maxspan=1m
[process where host.os.type == "linux" and event.type == "start" and process.name in ("cp", "rsync") and
   process.args in (
     "/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2", "/etc/ld.so.preload", "/lib64/ld-linux-x86-64.so.2",
     "/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2", "/usr/lib64/ld-linux-x86-64.so.2"
    )]
[file where host.os.type == "linux" and event.action == "creation" and file.extension == "so"]

Install detection rules in Elastic Security

Detect Dynamic Linker Copy 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).