From a2e7f27a2a496498455e3bbdd5b8fe9777ac9f4e Mon Sep 17 00:00:00 2001 From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Date: Mon, 3 Jun 2024 10:41:15 +0200 Subject: [PATCH 1/3] [New Rule] APT Package Manager Configuration File Creation --- ...nce_apt_package_manager_file_creation.toml | 109 ++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 rules/linux/persistence_apt_package_manager_file_creation.toml diff --git a/rules/linux/persistence_apt_package_manager_file_creation.toml b/rules/linux/persistence_apt_package_manager_file_creation.toml new file mode 100644 index 00000000000..72ce3edf706 --- /dev/null +++ b/rules/linux/persistence_apt_package_manager_file_creation.toml @@ -0,0 +1,109 @@ +[metadata] +creation_date = "2024/06/03" +integration = ["endpoint"] +maturity = "production" +updated_date = "2024/06/03" + +[rule] +author = ["Elastic"] +description = """ +Detects file creation events in the configuration directory for the APT package manager. In Linux, APT (Advanced Package +Tool) is a command-line utility used for handling packages on (by default) Debian-based systems, providing functions for +installing, updating, upgrading, and removing software along with managing package repositories. Attackers can backdoor +APT to gain persistence by injecting malicious code into scripts that APT runs, thereby ensuring continued unauthorized +access or control each time APT is used for package management. +""" +from = "now-9m" +index = ["logs-endpoint.events.*"] +language = "eql" +license = "Elastic License v2" +name = "APT Package Manager Configuration File Creation" +risk_score = 21 +rule_id = "7c2e1297-7664-42bc-af11-6d5d35220b6b" +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 = "eql" +query = ''' +file where host.os.type == "linux" and event.action == "creation" and file.path : "/etc/apt/apt.conf.d/*" and +not ( + process.executable in ( + "/bin/dpkg", "/usr/bin/dpkg", "/bin/dockerd", "/usr/bin/dockerd", "/usr/sbin/dockerd", "/bin/microdnf", + "/usr/bin/microdnf", "/bin/rpm", "/usr/bin/rpm", "/bin/snapd", "/usr/bin/snapd", "/bin/yum", "/usr/bin/yum", + "/bin/dnf", "/usr/bin/dnf", "/bin/podman", "/usr/bin/podman", "/bin/dnf-automatic", "/usr/bin/dnf-automatic", + "/bin/pacman", "/usr/bin/pacman", "/usr/bin/dpkg-divert", "/bin/dpkg-divert", "/sbin/apk", "/usr/sbin/apk", + "/usr/local/sbin/apk", "/usr/bin/apt", "/usr/sbin/pacman", "/bin/podman", "/usr/bin/podman", "/usr/bin/puppet", + "/bin/puppet", "/opt/puppetlabs/puppet/bin/puppet", "/usr/bin/chef-client", "/bin/chef-client", + "/bin/autossl_check", "/usr/bin/autossl_check", "/proc/self/exe", "/dev/fd/*", "/usr/bin/pamac-daemon", + "/bin/pamac-daemon", "/usr/lib/snapd/snapd", "/usr/local/bin/dockerd", "/usr/libexec/netplan/generate" + ) or + file.path :("/etc/apt/apt.conf.d/*.tmp*") or + file.extension in ("swp", "swpx", "swx", "dpkg-remove") or + file.Ext.original.extension == "dpkg-new" or + process.executable : ( + "/nix/store/*", "/var/lib/dpkg/*", "/tmp/vmis.*", "/snap/*", "/dev/fd/*", "/usr/lib/*", "/usr/libexec/*", + "/etc/kernel/*" + ) or + process.executable == null or + (process.name == "sed" and file.name : "sed*") or + (process.name == "perl" and file.name : "e2scrub_all.tmp*") +) +''' + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[[rule.threat.technique]] +id = "T1543" +name = "Create or Modify System Process" +reference = "https://attack.mitre.org/techniques/T1543/" + +[[rule.threat.technique]] +id = "T1574" +name = "Hijack Execution Flow" +reference = "https://attack.mitre.org/techniques/T1574/" + +[rule.threat.tactic] +id = "TA0003" +name = "Persistence" +reference = "https://attack.mitre.org/tactics/TA0003/" + +[[rule.threat]] +framework = "MITRE ATT&CK" + +[rule.threat.tactic] +id = "TA0005" +name = "Defense Evasion" +reference = "https://attack.mitre.org/tactics/TA0005/" From 9be028ca1f117bd31d4f6fd4e2567dd7c97fadc1 Mon Sep 17 00:00:00 2001 From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Date: Thu, 6 Jun 2024 11:28:25 +0200 Subject: [PATCH 2/3] Update rules/linux/persistence_apt_package_manager_file_creation.toml --- rules/linux/persistence_apt_package_manager_file_creation.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/rules/linux/persistence_apt_package_manager_file_creation.toml b/rules/linux/persistence_apt_package_manager_file_creation.toml index 72ce3edf706..11b2097e120 100644 --- a/rules/linux/persistence_apt_package_manager_file_creation.toml +++ b/rules/linux/persistence_apt_package_manager_file_creation.toml @@ -14,7 +14,7 @@ APT to gain persistence by injecting malicious code into scripts that APT runs, access or control each time APT is used for package management. """ from = "now-9m" -index = ["logs-endpoint.events.*"] +index = ["logs-endpoint.events.file*"] language = "eql" license = "Elastic License v2" name = "APT Package Manager Configuration File Creation" From 6455b41de4345650c601415850226c40bda31f68 Mon Sep 17 00:00:00 2001 From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com> Date: Mon, 10 Jun 2024 10:17:31 +0200 Subject: [PATCH 3/3] Update persistence_apt_package_manager_file_creation.toml --- ...ersistence_apt_package_manager_file_creation.toml | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/rules/linux/persistence_apt_package_manager_file_creation.toml b/rules/linux/persistence_apt_package_manager_file_creation.toml index 11b2097e120..f4a87958934 100644 --- a/rules/linux/persistence_apt_package_manager_file_creation.toml +++ b/rules/linux/persistence_apt_package_manager_file_creation.toml @@ -18,7 +18,8 @@ index = ["logs-endpoint.events.file*"] language = "eql" license = "Elastic License v2" name = "APT Package Manager Configuration File Creation" -risk_score = 21 +references = ["https://packetstormsecurity.com/files/152668/APT-Package-Manager-Persistence.html"] +risk_score = 47 rule_id = "7c2e1297-7664-42bc-af11-6d5d35220b6b" setup = """## Setup @@ -45,7 +46,7 @@ For more details on Elastic Agent configuration settings, refer to the [helper g - 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" +severity = "medium" tags = [ "Domain: Endpoint", "OS: Linux", @@ -57,8 +58,8 @@ tags = [ timestamp_override = "event.ingested" type = "eql" query = ''' -file where host.os.type == "linux" and event.action == "creation" and file.path : "/etc/apt/apt.conf.d/*" and -not ( +file where host.os.type == "linux" and event.action in ("rename", "creation") and +file.path : "/etc/apt/apt.conf.d/*" and not ( process.executable in ( "/bin/dpkg", "/usr/bin/dpkg", "/bin/dockerd", "/usr/bin/dockerd", "/usr/sbin/dockerd", "/bin/microdnf", "/usr/bin/microdnf", "/bin/rpm", "/usr/bin/rpm", "/bin/snapd", "/usr/bin/snapd", "/bin/yum", "/usr/bin/yum", @@ -67,7 +68,8 @@ not ( "/usr/local/sbin/apk", "/usr/bin/apt", "/usr/sbin/pacman", "/bin/podman", "/usr/bin/podman", "/usr/bin/puppet", "/bin/puppet", "/opt/puppetlabs/puppet/bin/puppet", "/usr/bin/chef-client", "/bin/chef-client", "/bin/autossl_check", "/usr/bin/autossl_check", "/proc/self/exe", "/dev/fd/*", "/usr/bin/pamac-daemon", - "/bin/pamac-daemon", "/usr/lib/snapd/snapd", "/usr/local/bin/dockerd", "/usr/libexec/netplan/generate" + "/bin/pamac-daemon", "/usr/lib/snapd/snapd", "/usr/local/bin/dockerd", "/usr/libexec/netplan/generate", + "/usr/local/bin/apt-get", "/usr/bin/apt-get" ) or file.path :("/etc/apt/apt.conf.d/*.tmp*") or file.extension in ("swp", "swpx", "swx", "dpkg-remove") or