[Detection Rules] Add 7.9 rules (#71808)

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

Author: rw-access

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/elastic_endpoint.json

@@ -4,6 +4,13 @@
   ],
   "description": "Generates a detection alert each time an Elastic Endpoint alert is received. Enabling this rule allows you to immediately begin investigating your Elastic Endpoint alerts.",
   "enabled": true,
+  "exceptions_list": [
+    {
+      "id": "endpoint_list",
+      "namespace_type": "agnostic",
+      "type": "endpoint"
+    }
+  ],
   "from": "now-10m",
   "index": [
     "logs-endpoint.alerts-*"

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/index.ts

@@ -205,6 +205,11 @@ import rule193 from './privilege_escalation_root_login_without_mfa.json';
 import rule194 from './privilege_escalation_updateassumerolepolicy.json';
 import rule195 from './elastic_endpoint.json';
 import rule196 from './external_alerts.json';
+import rule197 from './ml_cloudtrail_error_message_spike.json';
+import rule198 from './ml_cloudtrail_rare_error_code.json';
+import rule199 from './ml_cloudtrail_rare_method_by_city.json';
+import rule200 from './ml_cloudtrail_rare_method_by_country.json';
+import rule201 from './ml_cloudtrail_rare_method_by_user.json';
 
 export const rawRules = [
   rule1,
@@ -403,4 +408,9 @@ export const rawRules = [
   rule194,
   rule195,
   rule196,
+  rule197,
+  rule198,
+  rule199,
+  rule200,
+  rule201,
 ];

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_cloudtrail_error_message_spike.json

@@ -0,0 +1,29 @@
+{
+  "anomaly_threshold": 50,
+  "author": [
+    "Elastic"
+  ],
+  "description": "A machine learning job detected a significant spike in the rate of a particular error in the CloudTrail messages. Spikes in error messages may accompany attempts at privilege escalation, lateral movement, or discovery.",
+  "false_positives": [
+    "Spikes in error message activity can also be due to bugs in cloud automation scripts or workflows; changes to cloud automation scripts or workflows; adoption of new services; changes in the way services are used; or changes to IAM privileges."
+  ],
+  "from": "now-60m",
+  "interval": "15m",
+  "license": "Elastic License",
+  "machine_learning_job_id": "high_distinct_count_error_message",
+  "name": "Spike in AWS Error Messages",
+  "note": "### Investigating Spikes in CloudTrail Errors ###\nDetection alerts from this rule indicate a large spike in the number of CloudTrail log messages that contain a particular error message. The error message in question was associated with the response to an AWS API command or method call. Here are some possible avenues of investigation:\n- Examine the history of the error. Has it manifested before? If the error, which is visible in the `aws.cloudtrail.error_message` field, manifested only very recently, it might be related to recent changes in an automation module or script.\n- Examine the request parameters. These may provide indications as to the nature of the task being performed when the error occurred. Is the error related to unsuccessful attempts to enumerate or access objects, data or secrets? If so, this can sometimes be a byproduct of discovery, privilege escalation or lateral movement attempts.\n- Consider the user as identified by the user.name field. Is this activity part of an expected workflow for the user context? Examine the user identity in the `aws.cloudtrail.user_identity.arn` field and the access key id in the `aws.cloudtrail.user_identity.access_key_id` field which can help identify the precise user context. The user agent details in the `user_agent.original` field may also indicate what kind of a client made the request.\n- Consider the source IP address and geolocation for the calling user who issued the command. Do they look normal for the calling user? If the source is an EC2 IP address, is it associated with an EC2 instance in one of your accounts or could it be sourcing from an EC2 instance not under your control? If it is an authorized EC2 instance, is the activity associated with normal behavior for the instance role or roles? Are there any other alerts or signs of suspicious activity involving this instance?",
+  "references": [
+    "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"
+  ],
+  "risk_score": 21,
+  "rule_id": "78d3d8d9-b476-451d-a9e0-7a5addd70670",
+  "severity": "low",
+  "tags": [
+    "AWS",
+    "Elastic",
+    "ML"
+  ],
+  "type": "machine_learning",
+  "version": 1
+}

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_cloudtrail_rare_error_code.json

@@ -0,0 +1,29 @@
+{
+  "anomaly_threshold": 50,
+  "author": [
+    "Elastic"
+  ],
+  "description": "A machine learning job detected an unusual error in a CloudTrail message. These can be byproducts of attempted or successful persistence, privilege escalation, defense evasion, discovery, lateral movement, or collection.",
+  "false_positives": [
+    "Rare and unusual errors may indicate an impending service failure state. Rare and unusual user error activity can also be due to manual troubleshooting or reconfiguration attempts by insufficiently privileged users, bugs in cloud automation scripts or workflows, or changes to IAM privileges."
+  ],
+  "from": "now-60m",
+  "interval": "15m",
+  "license": "Elastic License",
+  "machine_learning_job_id": "rare_error_code",
+  "name": "Rare AWS Error Code",
+  "note": "### Investigating Unusual CloudTrail Error Activity ###\nDetection alerts from this rule indicate a rare and unusual error code that was associated with the response to an AWS API command or method call. Here are some possible avenues of investigation:\n- Examine the history of the error. Has it manifested before? If the error, which is visible in the `aws.cloudtrail.error_code field`, manifested only very recently, it might be related to recent changes in an automation module or script.\n- Examine the request parameters. These may provide indications as to the nature of the task being performed when the error occurred. Is the error related to unsuccessful attempts to enumerate or access objects, data, or secrets? If so, this can sometimes be a byproduct of discovery, privilege escalation, or lateral movement attempts.\n- Consider the user as identified by the `user.name` field. Is this activity part of an expected workflow for the user context? Examine the user identity in the `aws.cloudtrail.user_identity.arn` field and the access key id in the `aws.cloudtrail.user_identity.access_key_id` field which can help identify the precise user context. The user agent details in the `user_agent.original` field may also indicate what kind of a client made the request.\n- Consider the source IP address and geolocation for the calling user who issued the command. Do they look normal for the calling user? If the source is an EC2 IP address, is it associated with an EC2 instance in one of your accounts or could it be sourcing from an EC2 instance not under your control? If it is an authorized EC2 instance, is the activity associated with normal behavior for the instance role or roles? Are there any other alerts or signs of suspicious activity involving this instance?",
+  "references": [
+    "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"
+  ],
+  "risk_score": 21,
+  "rule_id": "19de8096-e2b0-4bd8-80c9-34a820813fff",
+  "severity": "low",
+  "tags": [
+    "AWS",
+    "Elastic",
+    "ML"
+  ],
+  "type": "machine_learning",
+  "version": 1
+}

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_cloudtrail_rare_method_by_city.json

@@ -0,0 +1,29 @@
+{
+  "anomaly_threshold": 50,
+  "author": [
+    "Elastic"
+  ],
+  "description": "A machine learning job detected AWS command activity that, while not inherently suspicious or abnormal, is sourcing from a geolocation (city) that is unusual for the command. This can be the result of compromised credentials or keys being used by a threat actor in a different geography then the authorized user(s).",
+  "false_positives": [
+    "New or unusual command and user geolocation activity can be due to manual troubleshooting or reconfiguration; changes in cloud automation scripts or workflows; adoption of new services; expansion into new regions; increased adoption of work from home policies; or users who travel frequently."
+  ],
+  "from": "now-60m",
+  "interval": "15m",
+  "license": "Elastic License",
+  "machine_learning_job_id": "rare_method_for_a_city",
+  "name": "Unusual City For an AWS Command",
+  "note": "### Investigating an Unusual CloudTrail Event ###\nDetection alerts from this rule indicate an AWS API command or method call that is rare and unusual for the geolocation of the source IP address. Here are some possible avenues of investigation:\n- Consider the source IP address and geolocation for the calling user who issued the command. Do they look normal for the calling user? If the source is an EC2 IP address, is it associated with an EC2 instance in one of your accounts or could it be sourcing from an EC2 instance not under your control? If it is an authorized EC2 instance, is the activity associated with normal behavior for the instance role or roles? Are there any other alerts or signs of suspicious activity involving this instance?\n- Consider the user as identified by the `user.name` field. Is this command part of an expected workflow for the user context? Examine the user identity in the `aws.cloudtrail.user_identity.arn` field and the access key id in the `aws.cloudtrail.user_identity.access_key_id` field which can help identify the precise user context. The user agent details in the `user_agent.original` field may also indicate what kind of a client made the request.\n- Consider the time of day. If the user is a human, not a program or script, did the activity take place during a normal time of day?\n- Examine the history of the command. If the command, which is visible in the `event.action field`, manifested only very recently, it might be part of a new automation module or script. If it has a consistent cadence - for example, if it appears in small numbers on a weekly or monthly cadence it might be part of a housekeeping or maintenance process.\n- Examine the request parameters. These may provide indications as to the source of the program or the nature of the tasks it is performing.",
+  "references": [
+    "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"
+  ],
+  "risk_score": 21,
+  "rule_id": "809b70d3-e2c3-455e-af1b-2626a5a1a276",
+  "severity": "low",
+  "tags": [
+    "AWS",
+    "Elastic",
+    "ML"
+  ],
+  "type": "machine_learning",
+  "version": 1
+}

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_cloudtrail_rare_method_by_country.json

@@ -0,0 +1,29 @@
+{
+  "anomaly_threshold": 50,
+  "author": [
+    "Elastic"
+  ],
+  "description": "A machine learning job detected AWS command activity that, while not inherently suspicious or abnormal, is sourcing from a geolocation (country) that is unusual for the command. This can be the result of compromised credentials or keys being used by a threat actor in a different geography then the authorized user(s).",
+  "false_positives": [
+    "New or unusual command and user geolocation activity can be due to manual troubleshooting or reconfiguration; changes in cloud automation scripts or workflows; adoption of new services; expansion into new regions; increased adoption of work from home policies; or users who travel frequently."
+  ],
+  "from": "now-60m",
+  "interval": "15m",
+  "license": "Elastic License",
+  "machine_learning_job_id": "rare_method_for_a_country",
+  "name": "Unusual Country For an AWS Command",
+  "note": "### Investigating an Unusual CloudTrail Event ###\nDetection alerts from this rule indicate an AWS API command or method call that is rare and unusual for the geolocation of the source IP address. Here are some possible avenues of investigation:\n- Consider the source IP address and geolocation for the calling user who issued the command. Do they look normal for the calling user? If the source is an EC2 IP address, is it associated with an EC2 instance in one of your accounts or could it be sourcing from an EC2 instance not under your control? If it is an authorized EC2 instance, is the activity associated with normal behavior for the instance role or roles? Are there any other alerts or signs of suspicious activity involving this instance?\n- Consider the user as identified by the `user.name` field. Is this command part of an expected workflow for the user context? Examine the user identity in the `aws.cloudtrail.user_identity.arn` field and the access key id in the `aws.cloudtrail.user_identity.access_key_id` field which can help identify the precise user context. The user agent details in the `user_agent.original` field may also indicate what kind of a client made the request.\n- Consider the time of day. If the user is a human, not a program or script, did the activity take place during a normal time of day?\n- Examine the history of the command. If the command, which is visible in the `event.action field`, manifested only very recently, it might be part of a new automation module or script. If it has a consistent cadence - for example, if it appears in small numbers on a weekly or monthly cadence it might be part of a housekeeping or maintenance process.\n- Examine the request parameters. These may provide indications as to the source of the program or the nature of the tasks it is performing.",
+  "references": [
+    "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"
+  ],
+  "risk_score": 21,
+  "rule_id": "dca28dee-c999-400f-b640-50a081cc0fd1",
+  "severity": "low",
+  "tags": [
+    "AWS",
+    "Elastic",
+    "ML"
+  ],
+  "type": "machine_learning",
+  "version": 1
+}

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_cloudtrail_rare_method_by_user.json

@@ -0,0 +1,29 @@
+{
+  "anomaly_threshold": 75,
+  "author": [
+    "Elastic"
+  ],
+  "description": "A machine learning job detected an AWS API command that, while not inherently suspicious or abnormal, is being made by a user context that does not normally use the command. This can be the result of compromised credentials or keys as someone uses a valid account to persist, move laterally, or exfil data.",
+  "false_positives": [
+    "New or unusual user command activity can be due to manual troubleshooting or reconfiguration; changes in cloud automation scripts or workflows; adoption of new services; or changes in the way services are used."
+  ],
+  "from": "now-60m",
+  "interval": "15m",
+  "license": "Elastic License",
+  "machine_learning_job_id": "rare_method_for_a_username",
+  "name": "Unusual AWS Command for a User",
+  "note": "### Investigating an Unusual CloudTrail Event ###\nDetection alerts from this rule indicate an AWS API command or method call that is rare and unusual for the calling IAM user. Here are some possible avenues of investigation:\n- Consider the user as identified by the `user.name` field. Is this command part of an expected workflow for the user context? Examine the user identity in the `aws.cloudtrail.user_identity.arn` field and the access key id in the `aws.cloudtrail.user_identity.access_key_id` field which can help identify the precise user context. The user agent details in the `user_agent.original` field may also indicate what kind of a client made the request.\n- Consider the source IP address and geolocation for the calling user who issued the command. Do they look normal for the calling user? If the source is an EC2 IP address, is it associated with an EC2 instance in one of your accounts or could it be sourcing from an EC2 instance not under your control? If it is an authorized EC2 instance, is the activity associated with normal behavior for the instance role or roles? Are there any other alerts or signs of suspicious activity involving this instance?\n- Consider the time of day. If the user is a human, not a program or script, did the activity take place during a normal time of day?\n- Examine the history of the command. If the command, which is visible in the `event.action field`, manifested only very recently, it might be part of a new automation module or script. If it has a consistent cadence - for example, if it appears in small numbers on a weekly or monthly cadence it might be part of a housekeeping or maintenance process.\n- Examine the request parameters. These may provide indications as to the source of the program or the nature of the tasks it is performing.",
+  "references": [
+    "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"
+  ],
+  "risk_score": 21,
+  "rule_id": "ac706eae-d5ec-4b14-b4fd-e8ba8086f0e1",
+  "severity": "low",
+  "tags": [
+    "AWS",
+    "Elastic",
+    "ML"
+  ],
+  "type": "machine_learning",
+  "version": 1
+}

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_linux_anomalous_network_activity.json

@@ -4,15 +4,12 @@
     "Elastic"
   ],
   "description": "Identifies Linux processes that do not usually use the network but have unexpected network activity, which can indicate command-and-control, lateral movement, persistence, or data exfiltration activity. A process with unusual network activity can denote process exploitation or injection, where the process is used to run persistence mechanisms that allow a malicious actor remote access or control of the host, data exfiltration, and execution of unauthorized network applications.",
-  "false_positives": [
-    "A newly installed program or one that rarely uses the network could trigger this signal."
-  ],
   "from": "now-45m",
   "interval": "15m",
   "license": "Elastic License",
   "machine_learning_job_id": "linux_anomalous_network_activity_ecs",
   "name": "Unusual Linux Network Activity",
-  "note": "### Investigating Unusual Network Activity ###\nSignals from this rule indicate the presence of network activity from a Linux process for which network activity is rare and unusual.  Here are some possible avenues of investigation:\n- Consider the IP addresses and ports. Are these used by normal but infrequent network workflows? Are they expected or unexpected? \n- If the destination IP address is remote or external, does it associate with an expected domain, organization or geography? Note: avoid interacting directly with suspected malicious IP addresses.\n- Consider the user as identified by the username field. Is this network activity part of an expected workflow for the user who ran the program?\n- Examine the history of execution. If this process manifested only very recently, it might be part of a new software package. If it has a consistent cadence - for example if it runs monthly or quarterly - it might be part of a monthly or quarterly business or maintenance process.\n- Examine the process arguments, title and working directory. These may provide indications as to the source of the program or the nature of the tasks it is performing.",
+  "note": "### Investigating Unusual Network Activity ###\nDetection alerts from this rule indicate the presence of network activity from a Linux process for which network activity is rare and unusual.  Here are some possible avenues of investigation:\n- Consider the IP addresses and ports. Are these used by normal but infrequent network workflows? Are they expected or unexpected? \n- If the destination IP address is remote or external, does it associate with an expected domain, organization or geography? Note: avoid interacting directly with suspected malicious IP addresses.\n- Consider the user as identified by the username field. Is this network activity part of an expected workflow for the user who ran the program?\n- Examine the history of execution. If this process manifested only very recently, it might be part of a new software package. If it has a consistent cadence - for example if it runs monthly or quarterly - it might be part of a monthly or quarterly business or maintenance process.\n- Examine the process arguments, title and working directory. These may provide indications as to the source of the program or the nature of the tasks it is performing.",
   "references": [
     "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html"
   ],

x-pack/plugins/security_solution/server/lib/detection_engine/rules/prepackaged_rules/ml_linux_anomalous_network_port_activity.json

@@ -5,7 +5,7 @@
   ],
   "description": "Identifies unusual destination port activity that can indicate command-and-control, persistence mechanism, or data exfiltration activity. Rarely used destination port activity is generally unusual in Linux fleets, and can indicate unauthorized access or threat actor activity.",
   "false_positives": [
-    "A newly installed program or one that rarely uses the network could trigger this signal."
+    "A newly installed program or one that rarely uses the network could trigger this alert."
   ],
   "from": "now-45m",
   "interval": "15m",