Suspicious command sent to EC2
Id | 21702832-aff3-4bd6-a8e1-663b6818503d |
Rulename | Suspicious command sent to EC2 |
Description | An attacker with the necessary permissions could be executing code remotely on a machine and saving the output to his own S3 bucket. Verify this action with the user identity. |
Severity | High |
Tactics | Execution |
Techniques | T1204 |
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/AWS_SuspiciousCommandEC2.yaml |
Version | 1.0.0 |
Arm template | 21702832-aff3-4bd6-a8e1-663b6818503d.json |
let command_executed = AWSCloudTrail
| where EventName in ("SendCommand","CreateAssociation") and isempty(ErrorCode) and isempty(ErrorMessage)
| extend params = tostring(parse_json(RequestParameters).parameters)
| extend s3bucketCommand = tostring(parse_json(RequestParameters).outputS3BucketName)
| extend s3bucketAssociation = tostring(parse_json(RequestParameters).outputLocation.s3Location.outputS3BucketName)
| where isnotempty(params)
| extend commandId = tostring(parse_json(ResponseElements).command.commandId)
| extend associationId = tostring(parse_json(ResponseElements).associationDescription.associationId)
| extend executionId = iff(isnotempty(commandId), commandId, associationId)
| extend s3bucket = iff(isnotempty(s3bucketCommand), s3bucketCommand, s3bucketAssociation)
| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
| extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName;
AWSCloudTrail
| where EventName == "PutObject" and isempty(ErrorCode) and isempty(ErrorMessage)
| extend s3bucket = tostring(parse_json(RequestParameters).bucketName)
| mv-expand todynamic(Resources)
| extend accountId=tostring(todynamic(Resources.['accountId']))
| where Resources contains "accountId" and accountId <> RecipientAccountId
| join command_executed on s3bucket
triggerOperator: gt
version: 1.0.0
query: |
let command_executed = AWSCloudTrail
| where EventName in ("SendCommand","CreateAssociation") and isempty(ErrorCode) and isempty(ErrorMessage)
| extend params = tostring(parse_json(RequestParameters).parameters)
| extend s3bucketCommand = tostring(parse_json(RequestParameters).outputS3BucketName)
| extend s3bucketAssociation = tostring(parse_json(RequestParameters).outputLocation.s3Location.outputS3BucketName)
| where isnotempty(params)
| extend commandId = tostring(parse_json(ResponseElements).command.commandId)
| extend associationId = tostring(parse_json(ResponseElements).associationDescription.associationId)
| extend executionId = iff(isnotempty(commandId), commandId, associationId)
| extend s3bucket = iff(isnotempty(s3bucketCommand), s3bucketCommand, s3bucketAssociation)
| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
| extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName;
AWSCloudTrail
| where EventName == "PutObject" and isempty(ErrorCode) and isempty(ErrorMessage)
| extend s3bucket = tostring(parse_json(RequestParameters).bucketName)
| mv-expand todynamic(Resources)
| extend accountId=tostring(todynamic(Resources.['accountId']))
| where Resources contains "accountId" and accountId <> RecipientAccountId
| join command_executed on s3bucket
status: Available
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
- entityType: IP
fieldMappings:
- columnName: IPCustomEntity
identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SuspiciousCommandEC2.yaml
queryFrequency: 1d
requiredDataConnectors:
- connectorId: AWS
dataTypes:
- AWSCloudTrail
name: Suspicious command sent to EC2
queryPeriod: 1d
severity: High
kind: Scheduled
tactics:
- Execution
id: 21702832-aff3-4bd6-a8e1-663b6818503d
description: |
'An attacker with the necessary permissions could be executing code remotely on a machine and saving the output to his own S3 bucket. Verify this action with the user identity.'
relevantTechniques:
- T1204
triggerThreshold: 0
{
"$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/21702832-aff3-4bd6-a8e1-663b6818503d')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/21702832-aff3-4bd6-a8e1-663b6818503d')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "Suspicious command sent to EC2",
"description": "'An attacker with the necessary permissions could be executing code remotely on a machine and saving the output to his own S3 bucket. Verify this action with the user identity.'\n",
"severity": "High",
"enabled": true,
"query": "let command_executed = AWSCloudTrail\n| where EventName in (\"SendCommand\",\"CreateAssociation\") and isempty(ErrorCode) and isempty(ErrorMessage)\n| extend params = tostring(parse_json(RequestParameters).parameters)\n| extend s3bucketCommand = tostring(parse_json(RequestParameters).outputS3BucketName)\n| extend s3bucketAssociation = tostring(parse_json(RequestParameters).outputLocation.s3Location.outputS3BucketName)\n| where isnotempty(params)\n| extend commandId = tostring(parse_json(ResponseElements).command.commandId)\n| extend associationId = tostring(parse_json(ResponseElements).associationDescription.associationId)\n| extend executionId = iff(isnotempty(commandId), commandId, associationId)\n| extend s3bucket = iff(isnotempty(s3bucketCommand), s3bucketCommand, s3bucketAssociation)\n| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))\n| extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName;\nAWSCloudTrail\n| where EventName == \"PutObject\" and isempty(ErrorCode) and isempty(ErrorMessage)\n| extend s3bucket = tostring(parse_json(RequestParameters).bucketName)\n| mv-expand todynamic(Resources)\n| extend accountId=tostring(todynamic(Resources.['accountId']))\n| where Resources contains \"accountId\" and accountId <> RecipientAccountId\n| join command_executed on s3bucket\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Execution"
],
"techniques": [
"T1204"
],
"alertRuleTemplateName": "21702832-aff3-4bd6-a8e1-663b6818503d",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "FullName"
}
],
"entityType": "Account"
},
{
"fieldMappings": [
{
"columnName": "IPCustomEntity",
"identifier": "Address"
}
],
"entityType": "IP"
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SuspiciousCommandEC2.yaml",
"status": "Available",
"templateVersion": "1.0.0"
}
}
]
}