AWSCloudTrail - Suspicious AWS EC2 Compute Resource Deployments

Back


Id	9e457dc4-81f0-4d25-bc37-a5fa4a17946a
Rulename	AWSCloudTrail - Suspicious AWS EC2 Compute Resource Deployments
Description	This detection focused on Suspicious deployment of AWS EC2 resource (virtual machine) scale sets was detected. This behavior might indicate that the threat actor is deploying computing resources for cryptocurrency mining activities.This detection centers around identifying suspicious instances of AWS EC2 resource deployment, particularly scale sets. Such behavior raises concerns of potential threat actor involvement, potentially indicative of efforts to deploy computing resources for the purpose of cryptocurrency mining activities.
Severity	Medium
Tactics	Impact
Techniques	T1496
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%20Web%20Services/Analytic%20Rules/SuspiciousAWSEC2ComputeResourceDeployments.yaml
Version	1.0.2
Arm template	9e457dc4-81f0-4d25-bc37-a5fa4a17946a.json

KQL

// Retrieve AWS CloudTrail events generated within the last day
AWSCloudTrail
// Filter events related to instance creation
| where EventName =~ "RunInstances"
// Exclude events with error messages
| where isempty(ErrorMessage)
// Extract the event source type
| extend EventSourceSplit = split(EventSource, ".")
| extend Type = tostring(EventSourceSplit[0])
// Extract instance-related details from the event data
| extend instance = tostring(parse_json(RequestParameters).instanceType),platform = tostring(parse_json(ResponseElements).instancesSet.items[0].platform)
// Determine the operating system platform
| extend OSplatform = iff(isempty(platform), tostring("Linux"), platform),CPU = tostring(parse_json(ResponseElements).instancesSet.items[0].cpuOptions),core = toint(parse_json(ResponseElements).instancesSet.items[0].cpuOptions.coreCount),corThread = toint(parse_json(ResponseElements).instancesSet.items[0].cpuOptions.threadsPerCore),InstanceId = tostring(parse_json(ResponseElements).instancesSet.items[0].instanceId)
// Filter out instances with empty core values
| where isnotempty(core)
// Calculate the total compute based on core and thread counts
| extend totalCorecompute = core * corThread
| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
| extend UserName = tostring(split(UserIdentityArn, '/')[-1])
| extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
| extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
  AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
// Summarize relevant information for analysis
| summarize Start= min(TimeGenerated),
  end=   max(TimeGenerated),
  totalgpu= sum(totalCorecompute)
  by SourceIpAddress, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityArn, UserAgent
// Filter results based on total GPU compute and time duration
| where totalgpu > 800
| where datetime_diff('hour', end, Start) < 8

YAML

queryPeriod: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/SuspiciousAWSEC2ComputeResourceDeployments.yaml
kind: Scheduled
version: 1.0.2
description: |
  'This detection focused on Suspicious deployment of AWS EC2 resource (virtual machine) scale sets was detected. This behavior might indicate that the threat actor is deploying computing resources for cryptocurrency mining activities.This detection centers around identifying suspicious instances of AWS EC2 resource deployment, particularly scale sets. Such behavior raises concerns of potential threat actor involvement, potentially indicative of efforts to deploy computing resources for the purpose of cryptocurrency mining activities.
queryFrequency: 1d
customDetails:
  TotalCoreCount: totalgpu
  UserAgent: UserAgent
  AWSUser: UserIdentityArn
  SourceIpAddress: SourceIpAddress
id: 9e457dc4-81f0-4d25-bc37-a5fa4a17946a
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
  entityType: Account
- fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
  entityType: IP
relevantTechniques:
- T1496
triggerThreshold: 0
tactics:
- Impact
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
query: |
  // Retrieve AWS CloudTrail events generated within the last day
  AWSCloudTrail
  // Filter events related to instance creation
  | where EventName =~ "RunInstances"
  // Exclude events with error messages
  | where isempty(ErrorMessage)
  // Extract the event source type
  | extend EventSourceSplit = split(EventSource, ".")
  | extend Type = tostring(EventSourceSplit[0])
  // Extract instance-related details from the event data
  | extend instance = tostring(parse_json(RequestParameters).instanceType),platform = tostring(parse_json(ResponseElements).instancesSet.items[0].platform)
  // Determine the operating system platform
  | extend OSplatform = iff(isempty(platform), tostring("Linux"), platform),CPU = tostring(parse_json(ResponseElements).instancesSet.items[0].cpuOptions),core = toint(parse_json(ResponseElements).instancesSet.items[0].cpuOptions.coreCount),corThread = toint(parse_json(ResponseElements).instancesSet.items[0].cpuOptions.threadsPerCore),InstanceId = tostring(parse_json(ResponseElements).instancesSet.items[0].instanceId)
  // Filter out instances with empty core values
  | where isnotempty(core)
  // Calculate the total compute based on core and thread counts
  | extend totalCorecompute = core * corThread
  | extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
  | extend UserName = tostring(split(UserIdentityArn, '/')[-1])
  | extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
  | extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
    AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
  // Summarize relevant information for analysis
  | summarize Start= min(TimeGenerated),
    end=   max(TimeGenerated),
    totalgpu= sum(totalCorecompute)
    by SourceIpAddress, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityArn, UserAgent
  // Filter results based on total GPU compute and time duration
  | where totalgpu > 800
  | where datetime_diff('hour', end, Start) < 8
alertDetailsOverride:
  alertDescriptionFormat: User {{AccountName}} deployed {{totalgpu}} total CPU cores across EC2 instances from {{SourceIpAddress}} within an 8-hour window, suggesting potential cryptocurrency mining activity.
  alertDisplayNameFormat: Suspicious EC2 deployment - {{totalgpu}} cores deployed by {{AccountName}}
severity: Medium
triggerOperator: gt
name: AWSCloudTrail - Suspicious AWS EC2 Compute Resource Deployments

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/9e457dc4-81f0-4d25-bc37-a5fa4a17946a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9e457dc4-81f0-4d25-bc37-a5fa4a17946a')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "User {{AccountName}} deployed {{totalgpu}} total CPU cores across EC2 instances from {{SourceIpAddress}} within an 8-hour window, suggesting potential cryptocurrency mining activity.",
          "alertDisplayNameFormat": "Suspicious EC2 deployment - {{totalgpu}} cores deployed by {{AccountName}}"
        },
        "alertRuleTemplateName": "9e457dc4-81f0-4d25-bc37-a5fa4a17946a",
        "customDetails": {
          "AWSUser": "UserIdentityArn",
          "SourceIpAddress": "SourceIpAddress",
          "TotalCoreCount": "totalgpu",
          "UserAgent": "UserAgent"
        },
        "description": "'This detection focused on Suspicious deployment of AWS EC2 resource (virtual machine) scale sets was detected. This behavior might indicate that the threat actor is deploying computing resources for cryptocurrency mining activities.This detection centers around identifying suspicious instances of AWS EC2 resource deployment, particularly scale sets. Such behavior raises concerns of potential threat actor involvement, potentially indicative of efforts to deploy computing resources for the purpose of cryptocurrency mining activities.\n",
        "displayName": "AWSCloudTrail - Suspicious AWS EC2 Compute Resource Deployments",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              },
              {
                "columnName": "RecipientAccountId",
                "identifier": "CloudAppAccountId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/SuspiciousAWSEC2ComputeResourceDeployments.yaml",
        "query": "// Retrieve AWS CloudTrail events generated within the last day\nAWSCloudTrail\n// Filter events related to instance creation\n| where EventName =~ \"RunInstances\"\n// Exclude events with error messages\n| where isempty(ErrorMessage)\n// Extract the event source type\n| extend EventSourceSplit = split(EventSource, \".\")\n| extend Type = tostring(EventSourceSplit[0])\n// Extract instance-related details from the event data\n| extend instance = tostring(parse_json(RequestParameters).instanceType),platform = tostring(parse_json(ResponseElements).instancesSet.items[0].platform)\n// Determine the operating system platform\n| extend OSplatform = iff(isempty(platform), tostring(\"Linux\"), platform),CPU = tostring(parse_json(ResponseElements).instancesSet.items[0].cpuOptions),core = toint(parse_json(ResponseElements).instancesSet.items[0].cpuOptions.coreCount),corThread = toint(parse_json(ResponseElements).instancesSet.items[0].cpuOptions.threadsPerCore),InstanceId = tostring(parse_json(ResponseElements).instancesSet.items[0].instanceId)\n// Filter out instances with empty core values\n| where isnotempty(core)\n// Calculate the total compute based on core and thread counts\n| extend totalCorecompute = core * corThread\n| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)\n| extend UserName = tostring(split(UserIdentityArn, '/')[-1])\n| extend AccountName = case( UserIdentityPrincipalid == \"Anonymous\", \"Anonymous\", isempty(UserIdentityUserName), UserName, UserIdentityUserName)\n| extend AccountName = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 0)[0]), AccountName),\n  AccountUPNSuffix = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 1)[0]), \"\")\n// Summarize relevant information for analysis\n| summarize Start= min(TimeGenerated),\n  end=   max(TimeGenerated),\n  totalgpu= sum(totalCorecompute)\n  by SourceIpAddress, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityArn, UserAgent\n// Filter results based on total GPU compute and time duration\n| where totalgpu > 800\n| where datetime_diff('hour', end, Start) < 8\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1496"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}