Suspicious AWS CLI Command Execution

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Id	8c2dc344-9352-4ca1-8863-b1b7a5e09e59
Rulename	Suspicious AWS CLI Command Execution
Description	This detection focuses on identifying potentially suspicious activities involving the execution of AWS Command Line Interface (CLI) commands, particularly focusing on reconnaissance operations.
Severity	Medium
Tactics	Reconnaissance
Techniques	T1595 T1592.004 T1589.002 T1589.003 T1590 T1591 T1596
Required data connectors	AWS
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/SuspiciousAWSCLICommandExecution.yaml
Version	1.0.0
Arm template	8c2dc344-9352-4ca1-8863-b1b7a5e09e59.json

KQL

let SuspiciousCommands= pack_array('iam.list-users', 'iam.list-groups', 'ec2.describe-vpcs', 'ec2.describe-subnets', 'route53.list-hosted-zones', 'kms.list-keys', 'kms.list-aliases', 'ecs.list-clusters', 'ecs.list-services', 'iam.list-roles', 'iam.get-user''iam.list-access-keys', 'ec2.describe-security-groups', 'ec2.describe-network-acls', 'ec2.describe-network-interfaces', 'ec2.describe-route-tables', 'ec2.describe-internet-gateways', 'ec2.describe-vpc-peering-connections', 'ec2.describe-network-interfaces', 'ec2.describe-network-interfaces', 'ec2.describe-transit-gateway-vpc-attachment', 'ec2.describe-vpc');
// Retrieve AWS CloudTrail events
AWSCloudTrail 
// Filter events with UserAgent starting with "aws-cli"
| where UserAgent startswith "aws-cli" 
// Extract the command from the UserAgent using string splitting
| extend command = tostring(split(UserAgent, "off command/", 1)[0])  
// Filter events based on predefined suspicious command list
| where command has_any (SuspiciousCommands)  
// Summarize relevant information for further analysis
| summarize 
    CommadCount = dcount(command), 
    EventCount = dcount(EventName), 
    commands = make_list(command), 
    Events = make_list(EventName) 
    by 
    bin(TimeGenerated, 1min), 
    UserIdentityUserName, 
    SourceIpAddress, 
    SessionMfaAuthenticated 
// Filter out results with a sufficient count of unique suspicious commands in 1 min time window
| where CommadCount >= 8

YAML

severity: Medium
name: Suspicious AWS CLI Command Execution
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/SuspiciousAWSCLICommandExecution.yaml
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
id: 8c2dc344-9352-4ca1-8863-b1b7a5e09e59
tactics:
- Reconnaissance
queryFrequency: 1d
triggerOperator: gt
customDetails:
  AWSUserIp: SourceIpAddress
  AWSUser: UserIdentityUserName
  SuspiciousCommand: commands
description: |
    'This detection focuses on identifying potentially suspicious activities involving the execution of AWS Command Line Interface (CLI) commands, particularly focusing on reconnaissance operations.'
triggerThreshold: 0
kind: Scheduled
relevantTechniques:
- T1595
- T1592.004
- T1589.002
- T1589.003
- T1590
- T1591
- T1596
query: |
  let SuspiciousCommands= pack_array('iam.list-users', 'iam.list-groups', 'ec2.describe-vpcs', 'ec2.describe-subnets', 'route53.list-hosted-zones', 'kms.list-keys', 'kms.list-aliases', 'ecs.list-clusters', 'ecs.list-services', 'iam.list-roles', 'iam.get-user''iam.list-access-keys', 'ec2.describe-security-groups', 'ec2.describe-network-acls', 'ec2.describe-network-interfaces', 'ec2.describe-route-tables', 'ec2.describe-internet-gateways', 'ec2.describe-vpc-peering-connections', 'ec2.describe-network-interfaces', 'ec2.describe-network-interfaces', 'ec2.describe-transit-gateway-vpc-attachment', 'ec2.describe-vpc');
  // Retrieve AWS CloudTrail events
  AWSCloudTrail 
  // Filter events with UserAgent starting with "aws-cli"
  | where UserAgent startswith "aws-cli" 
  // Extract the command from the UserAgent using string splitting
  | extend command = tostring(split(UserAgent, "off command/", 1)[0])  
  // Filter events based on predefined suspicious command list
  | where command has_any (SuspiciousCommands)  
  // Summarize relevant information for further analysis
  | summarize 
      CommadCount = dcount(command), 
      EventCount = dcount(EventName), 
      commands = make_list(command), 
      Events = make_list(EventName) 
      by 
      bin(TimeGenerated, 1min), 
      UserIdentityUserName, 
      SourceIpAddress, 
      SessionMfaAuthenticated 
  // Filter out results with a sufficient count of unique suspicious commands in 1 min time window
  | where CommadCount >= 8  
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
version: 1.0.0
queryPeriod: 1d

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/8c2dc344-9352-4ca1-8863-b1b7a5e09e59')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8c2dc344-9352-4ca1-8863-b1b7a5e09e59')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Suspicious AWS CLI Command Execution",
        "description": "'This detection focuses on identifying potentially suspicious activities involving the execution of AWS Command Line Interface (CLI) commands, particularly focusing on reconnaissance operations.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let SuspiciousCommands= pack_array('iam.list-users', 'iam.list-groups', 'ec2.describe-vpcs', 'ec2.describe-subnets', 'route53.list-hosted-zones', 'kms.list-keys', 'kms.list-aliases', 'ecs.list-clusters', 'ecs.list-services', 'iam.list-roles', 'iam.get-user''iam.list-access-keys', 'ec2.describe-security-groups', 'ec2.describe-network-acls', 'ec2.describe-network-interfaces', 'ec2.describe-route-tables', 'ec2.describe-internet-gateways', 'ec2.describe-vpc-peering-connections', 'ec2.describe-network-interfaces', 'ec2.describe-network-interfaces', 'ec2.describe-transit-gateway-vpc-attachment', 'ec2.describe-vpc');\n// Retrieve AWS CloudTrail events\nAWSCloudTrail \n// Filter events with UserAgent starting with \"aws-cli\"\n| where UserAgent startswith \"aws-cli\" \n// Extract the command from the UserAgent using string splitting\n| extend command = tostring(split(UserAgent, \"off command/\", 1)[0])  \n// Filter events based on predefined suspicious command list\n| where command has_any (SuspiciousCommands)  \n// Summarize relevant information for further analysis\n| summarize \n    CommadCount = dcount(command), \n    EventCount = dcount(EventName), \n    commands = make_list(command), \n    Events = make_list(EventName) \n    by \n    bin(TimeGenerated, 1min), \n    UserIdentityUserName, \n    SourceIpAddress, \n    SessionMfaAuthenticated \n// Filter out results with a sufficient count of unique suspicious commands in 1 min time window\n| where CommadCount >= 8\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Reconnaissance"
        ],
        "techniques": [
          "T1595",
          "T1592.004",
          "T1589.002",
          "T1589.003",
          "T1590",
          "T1591",
          "T1596"
        ],
        "alertRuleTemplateName": "8c2dc344-9352-4ca1-8863-b1b7a5e09e59",
        "customDetails": {
          "SuspiciousCommand": "commands",
          "AWSUserIp": "SourceIpAddress",
          "AWSUser": "UserIdentityUserName"
        },
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "SourceIpAddress"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/SuspiciousAWSCLICommandExecution.yaml",
        "templateVersion": "1.0.0"
      }
    }
  ]
}