IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Dynamic Linker Copyedit
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.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: high
Risk score: 73
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Persistence
- Threat: Orbit
- Data Source: Elastic Defend
Version: 106
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule queryedit
sequence by process.entity_id with maxspan=1m
[process where host.os.type == "linux" and event.type == "start" and process.name : ("cp", "rsync") and
process.args : ("/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2", "/etc/ld.so.preload")]
[file where host.os.type == "linux" and event.action == "creation" and file.extension == "so"]
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Hijack Execution Flow
- ID: T1574
- Reference URL: https://attack.mitre.org/techniques/T1574/
-
Sub-technique:
- Name: Dynamic Linker Hijacking
- ID: T1574.006
- Reference URL: https://attack.mitre.org/techniques/T1574/006/