[Rule Tuning] Dynamic Linker Copy (#3349)

rules/linux/persistence_dynamic_linker_backup.toml

@@ -3,13 +3,16 @@ creation_date = "2022/07/12"
 maturity = "production"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
-updated_date = "2023/11/02"
+updated_date = "2023/12/19"
 integration = ["endpoint"]
 
 [rule]
 author = ["Elastic"]
 description = """
-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.
+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.
 """
 from = "now-9m"
 index = ["logs-endpoint.events.*"]
@@ -48,18 +51,29 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast
 
 """
 severity = "high"
-tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Persistence", "Threat: Orbit", "Data Source: Elastic Defend"]
+tags = [
+ "Domain: Endpoint",
+ "OS: Linux",
+ "Use Case: Threat Detection",
+ "Tactic: Persistence",
+ "Threat: Orbit",
+ "Data Source: Elastic Defend"
+ ]
 type = "eql"
 
 query = '''
 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")]
+[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"]
 '''
 
 [[rule.threat]]
 framework = "MITRE ATT&CK"
+
 [[rule.threat.technique]]
 id = "T1574"
 name = "Hijack Execution Flow"