[Tuning] Linux DR Tuning - Part 7 (#3458)

* [Tuning] Linux DR Tuning - Part 7

* Update execution_potential_hack_tool_executed.toml

---------

Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com>

rules/linux/execution_nc_listener_via_rlwrap.toml

@@ -4,7 +4,7 @@ integration = ["endpoint"]
 maturity = "production"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
-updated_date = "2023/10/30"
+updated_date = "2024/02/20"
 
 [rule]
 author = ["Elastic"]
@@ -21,7 +21,7 @@ false_positives = [
     """,
 ]
 from = "now-9m"
-index = ["logs-endpoint.events.*"]
+index = ["logs-endpoint.events.*", "endgame-*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Netcat Listener Established via rlwrap"
@@ -59,15 +59,15 @@ tags = ["Domain: Endpoint",
         "OS: Linux",
         "Use Case: Threat Detection",
         "Tactic: Execution",
-        "Data Source: Elastic Defend"
+        "Data Source: Elastic Defend",
+        "Data Source: Elastic Endgame"
         ]
 timestamp_override = "event.ingested"
 type = "eql"
 query = '''
-process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and 
-process.name == "rlwrap" and process.args in (
-  "nc", "ncat", "netcat", "nc.openbsd", "socat"
-) and process.args : "*l*" and process.args_count >= 4
+process where host.os.type == "linux" and event.action in ("exec", "exec_event") and event.type == "start" and 
+process.name == "rlwrap" and process.args in ("nc", "ncat", "netcat", "nc.openbsd", "socat") and
+process.args : "*l*" and process.args_count >= 4
 '''
 
 [[rule.threat]]

rules/linux/execution_potential_hack_tool_executed.toml

@@ -1,8 +1,8 @@
 [metadata]
 creation_date = "2023/09/22"
-integration = ["endpoint"]
+integration = ["endpoint", "auditd_manager"]
 maturity = "production"
-updated_date = "2023/10/30"
+updated_date = "2024/02/20"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
 
@@ -14,7 +14,7 @@ this rule should be investigated further, as hack tools are commonly used by blu
 well.
 """
 from = "now-9m"
-index = ["logs-endpoint.events.*", "endgame-*"]
+index = ["logs-endpoint.events.*", "endgame-*", "auditbeat-*", "logs-auditd_manager.auditd-*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Potential Linux Hack Tool Launched"
@@ -49,17 +49,19 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast
 """
 severity = "medium"
 timestamp_override = "event.ingested"
-tags = ["Domain: Endpoint",
+tags = [
+        "Domain: Endpoint",
         "OS: Linux",
         "Use Case: Threat Detection",
         "Tactic: Execution",
         "Data Source: Elastic Endgame",
-        "Data Source: Elastic Defend"
+        "Data Source: Elastic Defend",
+        "Data Source: Auditd Manager"
         ]
 type = "eql"
 query = '''
-process where host.os.type == "linux" and event.action in ("exec", "exec_event") and event.type == "start" and
-process.name in (
+process where host.os.type == "linux" and event.action in ("exec", "exec_event", "executed", "process_started") and
+event.type == "start" and process.name in (
   // exploitation frameworks
   "crackmapexec", "msfconsole", "msfvenom", "sliver-client", "sliver-server", "havoc",
   // network scanners (nmap left out to reduce noise)
@@ -84,4 +86,3 @@ framework = "MITRE ATT&CK"
 id = "TA0002"
 name = "Execution"
 reference = "https://attack.mitre.org/tactics/TA0002/"
-

rules/linux/execution_process_started_from_process_id_file.toml

@@ -1,10 +1,10 @@
 [metadata]
 creation_date = "2022/05/11"
-integration = ["endpoint"]
+integration = ["endpoint", "auditd_manager"]
 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 = "2024/02/20"
 
 [rule]
 author = ["Elastic"]
@@ -21,7 +21,7 @@ false_positives = [
     """,
 ]
 from = "now-9m"
-index = ["logs-endpoint.events.*", "endgame-*"]
+index = ["logs-endpoint.events.*", "endgame-*", "auditbeat-*", "logs-auditd_manager.auditd-*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Process Started from Process ID (PID) File"
@@ -69,7 +69,16 @@ 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: Execution", "Threat: BPFDoor", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
+tags = [
+        "Domain: Endpoint",
+        "OS: Linux",
+        "Use Case: Threat Detection",
+        "Tactic: Execution",
+        "Threat: BPFDoor",
+        "Data Source: Elastic Endgame",
+        "Data Source: Elastic Defend",
+        "Data Source: Auditd Manager"
+        ]
 timestamp_override = "event.ingested"
 type = "eql"
 
@@ -78,17 +87,15 @@ process where host.os.type == "linux" and event.type == "start" and user.id == "
   process.executable regex~ """/var/run/\w+\.(pid|lock|reboot)"""
 '''
 
-
 [[rule.threat]]
 framework = "MITRE ATT&CK"
+
 [[rule.threat.technique]]
 id = "T1059"
 name = "Command and Scripting Interpreter"
 reference = "https://attack.mitre.org/techniques/T1059/"
 
-
 [rule.threat.tactic]
 id = "TA0002"
 name = "Execution"
 reference = "https://attack.mitre.org/tactics/TA0002/"
-

rules/linux/execution_python_tty_shell.toml

@@ -2,7 +2,7 @@
 creation_date = "2020/04/15"
 integration = ["endpoint"]
 maturity = "production"
-updated_date = "2023/11/02"
+updated_date = "2024/02/20"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
 
@@ -47,11 +47,18 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast
 """
 severity = "high"
 timestamp_override = "event.ingested"
-tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
+tags = [
+        "Domain: Endpoint",
+        "OS: Linux",
+        "Use Case: Threat Detection",
+        "Tactic: Execution",
+        "Data Source: Elastic Endgame",
+        "Data Source: Elastic Defend"
+        ]
 type = "eql"
 
 query = '''
-process where host.os.type == "linux" and event.action in ("exec", "exec_event") and
+process where host.os.type == "linux" and event.action in ("exec", "exec_event") and event.type == "start" and
 (
   (process.parent.name : "python*" and process.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh",
    "fish") and process.parent.args_count >= 3 and process.parent.args : "*pty.spawn*" and process.parent.args : "-c") or
@@ -60,18 +67,18 @@ process where host.os.type == "linux" and event.action in ("exec", "exec_event")
 )
 '''
 
-
 [[rule.threat]]
 framework = "MITRE ATT&CK"
+
 [[rule.threat.technique]]
 id = "T1059"
 name = "Command and Scripting Interpreter"
 reference = "https://attack.mitre.org/techniques/T1059/"
 
-  [[rule.threat.technique.subtechnique]]
-  id = "T1059.006"
-  name = "Python"
-  reference = "https://attack.mitre.org/techniques/T1059/006/"
+[[rule.threat.technique.subtechnique]]
+id = "T1059.006"
+name = "Python"
+reference = "https://attack.mitre.org/techniques/T1059/006/"
 
 [rule.threat.tactic]
 id = "TA0002"

rules/linux/execution_shell_via_background_process.toml

@@ -4,7 +4,7 @@ integration = ["endpoint"]
 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 = "2024/02/20"
 
 [rule]
 author = ["Elastic"]
@@ -13,7 +13,7 @@ Monitors for the execution of background processes with process arguments capabl
 channel. This may indicate the creation of a backdoor reverse connection, and should be investigated further. 
 """
 from = "now-9m"
-index = ["logs-endpoint.events.*"]
+index = ["logs-endpoint.events.*", "endgame-*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Potential Reverse Shell via Background Process"
@@ -47,10 +47,17 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast
 """
 severity = "medium"
 timestamp_override = "event.ingested"
-tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Defend"]
+tags = [
+        "Domain: Endpoint",
+        "OS: Linux",
+        "Use Case: Threat Detection",
+        "Tactic: Execution",
+        "Data Source: Elastic Defend",
+        "Data Source: Elastic Endgame"
+        ]
 type = "eql"
 query = '''
-process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and 
+process where host.os.type == "linux" and event.action in ("exec", "exec_event") and event.type == "start" and 
 process.name in ("setsid", "nohup") and process.args : "*/dev/tcp/*0>&1*" and 
 process.parent.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")
 '''