From 8fd80f74e042052acf40821efb692df47ea28bc0 Mon Sep 17 00:00:00 2001 From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Date: Thu, 19 Dec 2024 16:23:49 +0100 Subject: [PATCH 1/3] [New Rule] Kernel Object File Creation --- ...rsistence_kernel_object_file_creation.toml | 100 ++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 rules/linux/persistence_kernel_object_file_creation.toml diff --git a/rules/linux/persistence_kernel_object_file_creation.toml b/rules/linux/persistence_kernel_object_file_creation.toml new file mode 100644 index 00000000000..0f870f5d8ba --- /dev/null +++ b/rules/linux/persistence_kernel_object_file_creation.toml @@ -0,0 +1,100 @@ +[metadata] +creation_date = "2024/12/19" +integration = ["endpoint"] +maturity = "production" +updated_date = "2024/12/19" + +[rule] +author = ["Elastic"] +description = """ +This rule detects the creation of a Linux kernel object file (.ko) on a system. Threat actors may leverage Linux kernel +object files to load a rootkit or other type of malware on a system providing them with complete control and the ability +to hide from security products. +""" +from = "now-9m" +index = ["logs-endpoint.events.*"] +language = "kuery" +license = "Elastic License v2" +name = "Kernel Object File Creation" +risk_score = 21 +rule_id = "1965eab8-d17f-4b21-8c48-ad5ff133695d" +setup = """## Setup + +This rule requires data coming in from Elastic Defend. + +### Elastic Defend Integration Setup +Elastic Defend is integrated into the Elastic Agent using Fleet. Upon configuration, the integration allows the Elastic Agent to monitor events on your host and send data to the Elastic Security app. + +#### Prerequisite Requirements: +- Fleet is required for Elastic Defend. +- To configure Fleet Server refer to the [documentation](https://www.elastic.co/guide/en/fleet/current/fleet-server.html). + +#### The following steps should be executed in order to add the Elastic Defend integration on a Linux System: +- Go to the Kibana home page and click "Add integrations". +- In the query bar, search for "Elastic Defend" and select the integration to see more details about it. +- Click "Add Elastic Defend". +- Configure the integration name and optionally add a description. +- Select the type of environment you want to protect, either "Traditional Endpoints" or "Cloud Workloads". +- Select a configuration preset. Each preset comes with different default settings for Elastic Agent, you can further customize these later by configuring the Elastic Defend integration policy. [Helper guide](https://www.elastic.co/guide/en/security/current/configure-endpoint-integration-policy.html). +- We suggest selecting "Complete EDR (Endpoint Detection and Response)" as a configuration setting, that provides "All events; all preventions" +- Enter a name for the agent policy in "New agent policy name". If other agent policies already exist, you can click the "Existing hosts" tab and select an existing policy instead. +For more details on Elastic Agent configuration settings, refer to the [helper guide](https://www.elastic.co/guide/en/fleet/8.10/agent-policy.html). +- Click "Save and Continue". +- To complete the integration, select "Add Elastic Agent to your hosts" and continue to the next section to install the Elastic Agent on your hosts. +For more details on Elastic Defend refer to the [helper guide](https://www.elastic.co/guide/en/security/current/install-endpoint.html). +""" +severity = "low" +tags = [ + "Domain: Endpoint", + "OS: Linux", + "Use Case: Threat Detection", + "Tactic: Persistence", + "Tactic: Defense Evasion", + "Data Source: Elastic Defend", +] +timestamp_override = "event.ingested" +type = "new_terms" +query = ''' +event.category:file and host.os.type:linux and event.type:creation and file.extension:ko and not ( + file.path:/var/tmp/mkinitramfs_* or process.executable:/snap/* or process.name:cpio +) +''' + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[[rule.threat.technique]] +id = "T1547" +name = "Boot or Logon Autostart Execution" +reference = "https://attack.mitre.org/techniques/T1547/" + +[[rule.threat.technique.subtechnique]] +id = "T1547.006" +name = "Kernel Modules and Extensions" +reference = "https://attack.mitre.org/techniques/T1547/006/" + +[rule.threat.tactic] +id = "TA0003" +name = "Persistence" +reference = "https://attack.mitre.org/tactics/TA0003/" + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[[rule.threat.technique]] +id = "T1014" +name = "Rootkit" +reference = "https://attack.mitre.org/techniques/T1014/" + +[rule.threat.tactic] +id = "TA0005" +name = "Defense Evasion" +reference = "https://attack.mitre.org/tactics/TA0005/" + +[rule.new_terms] +field = "new_terms_fields" +value = ["process.executable.executable"] + +[[rule.new_terms.history_window_start]] +field = "history_window_start" +value = "now-10d" From 93b714a772dd7229aaa817abcc0463994b152713 Mon Sep 17 00:00:00 2001 From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Date: Thu, 19 Dec 2024 16:24:25 +0100 Subject: [PATCH 2/3] ++ --- rules/linux/persistence_kernel_object_file_creation.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/rules/linux/persistence_kernel_object_file_creation.toml b/rules/linux/persistence_kernel_object_file_creation.toml index 0f870f5d8ba..553bf5479ec 100644 --- a/rules/linux/persistence_kernel_object_file_creation.toml +++ b/rules/linux/persistence_kernel_object_file_creation.toml @@ -93,7 +93,7 @@ reference = "https://attack.mitre.org/tactics/TA0005/" [rule.new_terms] field = "new_terms_fields" -value = ["process.executable.executable"] +value = ["process.name", "file.name"] [[rule.new_terms.history_window_start]] field = "history_window_start" From 8a3ba12ba7748164ca6fb24756d02cc7a87b7fa5 Mon Sep 17 00:00:00 2001 From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Date: Fri, 3 Jan 2025 16:20:30 +0100 Subject: [PATCH 3/3] Update rules/linux/persistence_kernel_object_file_creation.toml Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> --- rules/linux/persistence_kernel_object_file_creation.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/rules/linux/persistence_kernel_object_file_creation.toml b/rules/linux/persistence_kernel_object_file_creation.toml index 553bf5479ec..4d95f4e8f37 100644 --- a/rules/linux/persistence_kernel_object_file_creation.toml +++ b/rules/linux/persistence_kernel_object_file_creation.toml @@ -12,7 +12,7 @@ object files to load a rootkit or other type of malware on a system providing th to hide from security products. """ from = "now-9m" -index = ["logs-endpoint.events.*"] +index = ["logs-endpoint.events.file-*"] language = "kuery" license = "Elastic License v2" name = "Kernel Object File Creation"