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[Rule Tuning] Q2 Linux DR Tuning - CP (#4170)

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* [Rule Tuning] Q2 Linux DR Tuning - CP

* Update command_and_control_non_standard_ssh_port.toml
This commit is contained in:
Ruben Groenewoud
2024-10-18 16:38:14 +02:00
committed by GitHub
parent ac6a49eeea
commit 09bd4cef16
6 changed files with 36 additions and 98 deletions
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rules/cross-platform/command_and_control_non_standard_ssh_port.toml
+12 -7
View File
@@ -2,7 +2,7 @@
creation_date = "2022/10/18"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/05/21"
updated_date = "2024/10/18"
[rule]
author = ["Elastic"]
@@ -37,30 +37,35 @@ tags = [
"Data Source: Elastic Defend",
]
type = "eql"
query = '''
sequence by process.entity_id with maxspan=1m
[process where event.action == "exec" and process.name:"ssh" and not process.parent.name in (
[process where event.action == "exec" and process.name in ("ssh", "sshd") and not process.parent.name in (
"rsync", "pyznap", "git", "ansible-playbook", "scp", "pgbackrest", "git-lfs", "expect", "Sourcetree", "ssh-copy-id",
"run"
)
]
[network where process.name:"ssh" and event.action in ("connection_attempted", "connection_accepted") and
destination.port != 22 and destination.ip != "127.0.0.1" and network.transport: "tcp"
destination.port != 22 and network.transport == "tcp" and not (
destination.ip == null or destination.ip == "0.0.0.0" or cidrmatch(
destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24", "192.0.0.0/29",
"192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24",
"192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10",
"192.175.48.0/24","198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1", "FE80::/10",
"FF00::/8"
)
)
]
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1571"
name = "Non-Standard Port"
reference = "https://attack.mitre.org/techniques/T1571/"
[rule.threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"
rules/cross-platform/defense_evasion_elastic_agent_service_terminated.toml
+4 -7
View File
@@ -2,7 +2,7 @@
creation_date = "2022/05/23"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/05/21"
updated_date = "2024/10/18"
[rule]
author = ["Elastic"]
@@ -39,7 +39,6 @@ tags = [
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where
/* net, sc or wmic stopping or deleting Elastic Agent on Windows */
@@ -52,7 +51,7 @@ or
(event.type == "end" and
(process.name : ("systemctl", "service") and
process.args : "elastic-agent" and
process.args : "stop")
process.args : ("stop", "disable"))
or
/* pkill , killall used to stop Elastic Agent on Linux */
( event.type == "end" and process.name : ("pkill", "killall") and process.args: "elastic-agent")
@@ -63,22 +62,20 @@ or
event.action : "end"))
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1562"
name = "Impair Defenses"
reference = "https://attack.mitre.org/techniques/T1562/"
[[rule.threat.technique.subtechnique]]
id = "T1562.001"
name = "Disable or Modify Tools"
reference = "https://attack.mitre.org/techniques/T1562/001/"
[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
rules/cross-platform/defense_evasion_masquerading_space_after_filename.toml
+11 -10
View File
@@ -2,7 +2,7 @@
creation_date = "2022/10/18"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/05/21"
updated_date = "2024/10/18"
[rule]
author = ["Elastic"]
@@ -42,30 +42,31 @@ tags = [
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where host.os.type:("linux","macos") and
event.type == "start" and
(process.executable regex~ """/[a-z0-9\s_\-\\./]+\s""") and not
process.name in ("ls", "find", "grep", "xkbcomp")
process where host.os.type:("linux","macos") and event.type == "start" and
process.executable regex~ """/[a-z0-9\s_\-\\./]+\s""" and not (
process.name in ("ls", "find", "grep", "xkbcomp") or
process.executable like ("/opt/nessus_agent/*", "/opt/gitlab/sv/gitlab-exporter/*", "/tmp/ansible-admin/*") or
process.parent.args in (
"./check_rubrik", "/usr/bin/check_mk_agent", "/etc/rubrik/start_stop_bootstrap.sh", "/etc/rubrik/start_stop_agent.sh"
)
)
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1036"
name = "Masquerading"
reference = "https://attack.mitre.org/techniques/T1036/"
[[rule.threat.technique.subtechnique]]
id = "T1036.006"
name = "Space after Filename"
reference = "https://attack.mitre.org/techniques/T1036/006/"
[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
rules/cross-platform/discovery_security_software_grep.toml
+4 -6
View File
@@ -2,7 +2,7 @@
creation_date = "2020/12/20"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/05/21"
updated_date = "2024/10/18"
[rule]
author = ["Elastic"]
@@ -68,7 +68,6 @@ tags = [
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where event.type == "start" and
process.name : "grep" and user.id != "0" and
@@ -106,6 +105,7 @@ process.name : "grep" and user.id != "0" and
) and
not (
(process.args : "Avast" and process.args : "Passwords") or
(process.args == "osquery.conf") or
(process.parent.args : "/opt/McAfee/agent/scripts/ma" and process.parent.args : "checkhealth") or
(process.command_line : (
"grep ESET Command-line scanner, version %s -A2",
@@ -121,22 +121,20 @@ process.name : "grep" and user.id != "0" and
)
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1518"
name = "Software Discovery"
reference = "https://attack.mitre.org/techniques/T1518/"
[[rule.threat.technique.subtechnique]]
id = "T1518.001"
name = "Security Software Discovery"
reference = "https://attack.mitre.org/techniques/T1518/001/"
[rule.threat.tactic]
id = "TA0007"
name = "Discovery"
reference = "https://attack.mitre.org/tactics/TA0007/"
rules/cross-platform/execution_python_script_in_cmdline.toml
-61
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@@ -1,61 +0,0 @@
[metadata]
creation_date = "2021/01/13"
integration = ["endpoint"]
maturity = "development"
updated_date = "2024/08/08"
[rule]
author = ["Elastic"]
description = """
Identifies when a Python script is executed using command line input and imports the sys module. Attackers often use
this method to execute malicious scripts and avoiding writing it to disk.
"""
false_positives = ["Legitimate Python scripting activity."]
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Python Script Execution via Command Line"
risk_score = 47
rule_id = "ee9f08dc-cf80-4124-94ae-08c405f059ae"
setup = """## Setup
If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
events will not define `event.ingested` and default fallback for EQL rules was not added until version 8.2.
Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
`event.ingested` to @timestamp.
For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
"""
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "OS: macOS", "OS: Windows", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Defend"]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where event.type in ("start", "process_started") and
process.name : "python*" and process.args : "-c" and process.args : "*import*sys*"
'''
[[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 = "T1059.003"
name = "Windows Command Shell"
reference = "https://attack.mitre.org/techniques/T1059/003/"
[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
rules/cross-platform/execution_suspicious_jar_child_process.toml
+5 -7
View File
@@ -2,7 +2,7 @@
creation_date = "2021/01/19"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/05/21"
updated_date = "2024/10/18"
[rule]
author = ["Elastic"]
@@ -14,7 +14,7 @@ from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "kuery"
license = "Elastic License v2"
name = "Suspicious JAVA Child Process"
name = "Deprecated - Suspicious JAVA Child Process"
note = """## Triage and analysis
### Investigating Suspicious Java Child Process
@@ -85,20 +85,19 @@ event.category:process and event.type:("start" or "process_started") and process
)
'''
[[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 = "T1059.007"
name = "JavaScript"
reference = "https://attack.mitre.org/techniques/T1059/007/"
[rule.threat.tactic]
id = "TA0002"
name = "Execution"
@@ -107,8 +106,7 @@ reference = "https://attack.mitre.org/tactics/TA0002/"
[rule.new_terms]
field = "new_terms_fields"
value = ["host.id", "process.command_line"]
[[rule.new_terms.history_window_start]]
field = "history_window_start"
value = "now-14d"