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[Tuning] Linux DR Tuning - Part 2 (#3453)

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* [Tuning] Linux DR Tuning - Part 2

* Update defense_evasion_binary_copied_to_suspicious_directory.toml

* Update defense_evasion_base16_or_base32_encoding_or_decoding_activity.toml

(cherry picked from commit 0e48747aa6)
This commit is contained in:
Ruben Groenewoud
2024-02-20 14:17:17 +01:00
committed by github-actions[bot]
parent cfc0b41e20
commit 24d4da7b5d
5 changed files with 57 additions and 39 deletions
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rules/linux/credential_access_potential_linux_local_account_bruteforce.toml
+14 -6
View File
@@ -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"]
@@ -47,14 +47,22 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast
"""
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Credential Access", "Data Source: Elastic Defend"]
tags = [
"Domain: Endpoint",
"OS: Linux",
"Use Case: Threat Detection",
"Tactic: Credential Access",
"Data Source: Elastic Defend"
]
type = "eql"
query = '''
sequence by host.id, process.parent.executable, user.id with maxspan=1s
[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and process.name == "su" and
not process.parent.name in (
"bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "clickhouse-server"
)] with runs=10
[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and process.name == "su" and
not process.parent.name in (
"bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "clickhouse-server", "ma", "gitlab-runner",
"updatedb.findutils", "cron"
)
] with runs=10
'''
[[rule.threat]]
rules/linux/credential_access_proc_credential_dumping.toml
+16 -12
View File
@@ -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"]
@@ -52,24 +52,31 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast
"""
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Credential Access", "Use Case: Vulnerability", "Data Source: Elastic Defend"]
tags = [
"Domain: Endpoint",
"OS: Linux",
"Use Case: Threat Detection",
"Tactic: Credential Access",
"Use Case: Vulnerability",
"Data Source: Elastic Defend"
]
type = "eql"
query = '''
sequence by process.parent.name,host.name with maxspan=1m
[process where host.os.type == "linux" and process.name == "ps" and event.action == "exec"
and process.args in ("-eo", "pid", "command") ]
[process where host.os.type == "linux" and process.name == "strings" and event.action == "exec"
and process.args : "/tmp/*" ]
sequence by host.id, process.parent.name with maxspan=1m
[process where host.os.type == "linux" and process.name == "ps" and event.action == "exec"
and process.args in ("-eo", "pid", "command")]
[process where host.os.type == "linux" and process.name == "strings" and event.action == "exec"
and process.args : "/tmp/*"]
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1003"
name = "OS Credential Dumping"
reference = "https://attack.mitre.org/techniques/T1003/"
[[rule.threat.technique.subtechnique]]
id = "T1003.007"
name = "Proc Filesystem"
@@ -80,10 +87,7 @@ id = "T1212"
name = "Exploitation for Credential Access"
reference = "https://attack.mitre.org/techniques/T1212/"
[rule.threat.tactic]
id = "TA0006"
name = "Credential Access"
reference = "https://attack.mitre.org/tactics/TA0006/"
rules/linux/defense_evasion_base16_or_base32_encoding_or_decoding_activity.toml
+17 -12
View File
@@ -1,10 +1,10 @@
[metadata]
creation_date = "2020/04/17"
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"]
@@ -16,8 +16,8 @@ false_positives = [
""",
]
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*", "endgame-*"]
language = "kuery"
index = ["logs-endpoint.events.*", "endgame-*", "auditbeat-*", "logs-auditd_manager.auditd-*"]
language = "eql"
license = "Elastic License v2"
name = "Base16 or Base32 Encoding/Decoding Activity"
risk_score = 21
@@ -61,18 +61,25 @@ Auditbeat is a lightweight shipper that you can install on your servers to audit
"""
severity = "low"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
tags = [
"Domain: Endpoint",
"OS: Linux",
"Use Case: Threat Detection",
"Tactic: Defense Evasion",
"Data Source: Elastic Endgame",
"Data Source: Elastic Defend",
"Data Source: Auditd Manager"
]
timestamp_override = "event.ingested"
type = "query"
type = "eql"
query = '''
event.category:process and host.os.type:linux and event.type:(start or process_started) and
process.name:(base16 or base32 or base32plain or base32hex)
process where host.os.type == "linux" and event.type in ("start", "process_started") and
process.name in ("base16", "base32", "base32plain", "base32hex") and not process.args in ("--help", "--version")
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1027"
name = "Obfuscated Files or Information"
@@ -83,9 +90,7 @@ id = "T1140"
name = "Deobfuscate/Decode Files or Information"
reference = "https://attack.mitre.org/techniques/T1140/"
[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
rules/linux/defense_evasion_binary_copied_to_suspicious_directory.toml
+2 -2
View File
@@ -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 = "2023/12/12"
updated_date = "2024/02/20"
[rule]
author = ["Elastic"]
@@ -82,7 +82,7 @@ sequence by host.id, process.entity_id with maxspan=1s
) and not process.parent.name in ("dracut-install", "apticron", "generate-from-dir", "platform-python")]
[file where host.os.type == "linux" and event.action == "creation" and file.path : (
"/dev/shm/*", "/run/shm/*", "/tmp/*", "/var/tmp/*", "/run/*", "/var/run/*", "/var/www/*", "/proc/*/fd/*"
) and not file.path : ("/tmp/rear*", "/var/tmp/dracut*")]
) and not file.path : ("/tmp/rear*", "/var/tmp/rear*", "/var/tmp/dracut*", "/var/tmp/mkinitramfs*")]
'''
[[rule.threat]]
rules/linux/defense_evasion_clear_kernel_ring_buffer.toml
+8 -7
View File
@@ -1,10 +1,10 @@
[metadata]
creation_date = "2023/10/24"
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"]
@@ -13,7 +13,7 @@ Monitors for the deletion of the kernel ring buffer events through dmesg. Attack
to evade detection after installing a Linux kernel module (LKM).
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
index = ["logs-endpoint.events.*", "endgame-*", "auditbeat-*", "logs-auditd_manager.auditd-*"]
language = "eql"
license = "Elastic License v2"
name = "Attempt to Clear Kernel Ring Buffer"
@@ -51,13 +51,15 @@ tags = [
"OS: Linux",
"Use Case: Threat Detection",
"Tactic: Defense Evasion",
"Data Source: Elastic Defend"
"Data Source: Elastic Defend",
"Data Source: Elastic Endgame",
"Data Source: Auditd Manager"
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
process.name == "dmesg" and process.args : "-c"
process where host.os.type == "linux" and event.action in ("exec", "exec_event", "executed") and
event.type == "start" and process.name == "dmesg" and process.args : "-c"
'''
[[rule.threat]]
@@ -87,4 +89,3 @@ reference = "https://attack.mitre.org/techniques/T1070/002/"
name = "Defense Evasion"
id = "TA0005"
reference = "https://attack.mitre.org/tactics/TA0005/"