Detect CoreBackUp Deletion Activity from related Security Alerts
Id | 011c84d8-85f0-4370-b864-24c13455aa94 |
Rulename | Detect CoreBackUp Deletion Activity from related Security Alerts |
Description | The query identifies any efforts by an attacker to delete backup containers, while also searching for any security alerts that may be linked to the same activity, in order to uncover additional information about the attacker’s actions.’ Though such an activity could be legitimate as part of business operation, some ransomware actors may perform such operation to cause interruption to regular business services. |
Severity | Medium |
Tactics | Impact |
Techniques | T1496 |
Required data connectors | AzureSecurityCenter MicrosoftDefenderForCloudTenantBased |
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/Microsoft Defender for Cloud/Analytic Rules/CoreBackupDeletionwithSecurityAlert.yaml |
Version | 1.0.2 |
Arm template | 011c84d8-85f0-4370-b864-24c13455aa94.json |
SecurityAlert
| extend Extprop = parse_json(ExtendedProperties)
| mv-expand todynamic(Entities)
| extend HostName = iff(isnotempty(tostring(Extprop["Compromised Host"])), tolower(tostring(Extprop["Compromised Host"])), tolower(tostring(parse_json(Entities).HostName)))
| where isnotempty(HostName)
| mv-expand todynamic(split(HostName, ','))
| extend DnsDomain = iff(isnotempty(tostring(Extprop["Machine Domain"])), tostring(Extprop["Machine Domain"]), tostring(parse_json(Entities).DnsDomain))
| extend UserName = iff(isnotempty(tostring(Extprop["User Name"])), tostring(Extprop["User Name"]), iff(tostring(parse_json(Entities).Type) == 'account', tostring(parse_json(Entities).Name), ''))
| extend NTDomain = iff(isnotempty(tostring(Extprop["User Domain"])), tostring(Extprop["User Domain"]), tostring(parse_json(Entities).NTDomain))
| extend IpAddress = iff(tostring(parse_json(Entities).Type) == 'ip', tostring(parse_json(Entities).Address), tostring(parse_json(Extprop).["IpAddress"]))
| summarize timestamp = arg_max(TimeGenerated, *) by AlertName, tostring(HostName)
| project timestamp, AlertName, UserName, NTDomain, tostring(HostName), DnsDomain, IpAddress
| join kind=inner
(
CoreAzureBackup
| where State =~ "Deleted"
| where OperationName =~ "BackupItem"
| extend data = split(BackupItemUniqueId, ";")
| extend AzureLocation = data[0], VaultId=data[1], HostName=tolower(tostring(data[2])), DrivesBackedUp=data[3]
| project timestamp = TimeGenerated, AzureLocation, VaultId, HostName, DrivesBackedUp, State, BackupItemUniqueId, _ResourceId, OperationName, BackupItemFriendlyName
)
on HostName
| project timestamp, AlertName, HostName, DnsDomain, UserName, NTDomain, _ResourceId, IpAddress, VaultId, AzureLocation, DrivesBackedUp, State, BackupItemUniqueId, OperationName, BackupItemFriendlyName
kind: Scheduled
triggerThreshold: 0
tactics:
- Impact
id: 011c84d8-85f0-4370-b864-24c13455aa94
query: |
SecurityAlert
| extend Extprop = parse_json(ExtendedProperties)
| mv-expand todynamic(Entities)
| extend HostName = iff(isnotempty(tostring(Extprop["Compromised Host"])), tolower(tostring(Extprop["Compromised Host"])), tolower(tostring(parse_json(Entities).HostName)))
| where isnotempty(HostName)
| mv-expand todynamic(split(HostName, ','))
| extend DnsDomain = iff(isnotempty(tostring(Extprop["Machine Domain"])), tostring(Extprop["Machine Domain"]), tostring(parse_json(Entities).DnsDomain))
| extend UserName = iff(isnotempty(tostring(Extprop["User Name"])), tostring(Extprop["User Name"]), iff(tostring(parse_json(Entities).Type) == 'account', tostring(parse_json(Entities).Name), ''))
| extend NTDomain = iff(isnotempty(tostring(Extprop["User Domain"])), tostring(Extprop["User Domain"]), tostring(parse_json(Entities).NTDomain))
| extend IpAddress = iff(tostring(parse_json(Entities).Type) == 'ip', tostring(parse_json(Entities).Address), tostring(parse_json(Extprop).["IpAddress"]))
| summarize timestamp = arg_max(TimeGenerated, *) by AlertName, tostring(HostName)
| project timestamp, AlertName, UserName, NTDomain, tostring(HostName), DnsDomain, IpAddress
| join kind=inner
(
CoreAzureBackup
| where State =~ "Deleted"
| where OperationName =~ "BackupItem"
| extend data = split(BackupItemUniqueId, ";")
| extend AzureLocation = data[0], VaultId=data[1], HostName=tolower(tostring(data[2])), DrivesBackedUp=data[3]
| project timestamp = TimeGenerated, AzureLocation, VaultId, HostName, DrivesBackedUp, State, BackupItemUniqueId, _ResourceId, OperationName, BackupItemFriendlyName
)
on HostName
| project timestamp, AlertName, HostName, DnsDomain, UserName, NTDomain, _ResourceId, IpAddress, VaultId, AzureLocation, DrivesBackedUp, State, BackupItemUniqueId, OperationName, BackupItemFriendlyName
requiredDataConnectors:
- dataTypes:
- SecurityAlert
connectorId: AzureSecurityCenter
- dataTypes:
- SecurityAlert
connectorId: MicrosoftDefenderForCloudTenantBased
name: Detect CoreBackUp Deletion Activity from related Security Alerts
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: UserName
- identifier: NTDomain
columnName: NTDomain
- entityType: AzureResource
fieldMappings:
- identifier: ResourceId
columnName: _ResourceId
- entityType: Host
fieldMappings:
- identifier: HostName
columnName: HostName
- identifier: DnsDomain
columnName: DnsDomain
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IpAddress
status: Available
description: |
'The query identifies any efforts by an attacker to delete backup containers, while also searching for any security alerts that may be linked to the same activity, in order to uncover additional information about the attacker's actions.'
Though such an activity could be legitimate as part of business operation, some ransomware actors may perform such operation to cause interruption to regular business services.'
severity: Medium
queryFrequency: 1d
version: 1.0.2
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender for Cloud/Analytic Rules/CoreBackupDeletionwithSecurityAlert.yaml
relevantTechniques:
- T1496
queryPeriod: 1d
{
"$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/011c84d8-85f0-4370-b864-24c13455aa94')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/011c84d8-85f0-4370-b864-24c13455aa94')]",
"properties": {
"alertRuleTemplateName": "011c84d8-85f0-4370-b864-24c13455aa94",
"customDetails": null,
"description": "'The query identifies any efforts by an attacker to delete backup containers, while also searching for any security alerts that may be linked to the same activity, in order to uncover additional information about the attacker's actions.' \nThough such an activity could be legitimate as part of business operation, some ransomware actors may perform such operation to cause interruption to regular business services.'\n",
"displayName": "Detect CoreBackUp Deletion Activity from related Security Alerts",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "UserName",
"identifier": "Name"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "AzureResource",
"fieldMappings": [
{
"columnName": "_ResourceId",
"identifier": "ResourceId"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "DnsDomain",
"identifier": "DnsDomain"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IpAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender for Cloud/Analytic Rules/CoreBackupDeletionwithSecurityAlert.yaml",
"query": "SecurityAlert\n| extend Extprop = parse_json(ExtendedProperties)\n| mv-expand todynamic(Entities)\n| extend HostName = iff(isnotempty(tostring(Extprop[\"Compromised Host\"])), tolower(tostring(Extprop[\"Compromised Host\"])), tolower(tostring(parse_json(Entities).HostName)))\n| where isnotempty(HostName)\n| mv-expand todynamic(split(HostName, ','))\n| extend DnsDomain = iff(isnotempty(tostring(Extprop[\"Machine Domain\"])), tostring(Extprop[\"Machine Domain\"]), tostring(parse_json(Entities).DnsDomain))\n| extend UserName = iff(isnotempty(tostring(Extprop[\"User Name\"])), tostring(Extprop[\"User Name\"]), iff(tostring(parse_json(Entities).Type) == 'account', tostring(parse_json(Entities).Name), ''))\n| extend NTDomain = iff(isnotempty(tostring(Extprop[\"User Domain\"])), tostring(Extprop[\"User Domain\"]), tostring(parse_json(Entities).NTDomain))\n| extend IpAddress = iff(tostring(parse_json(Entities).Type) == 'ip', tostring(parse_json(Entities).Address), tostring(parse_json(Extprop).[\"IpAddress\"]))\n| summarize timestamp = arg_max(TimeGenerated, *) by AlertName, tostring(HostName)\n| project timestamp, AlertName, UserName, NTDomain, tostring(HostName), DnsDomain, IpAddress\n| join kind=inner\n(\nCoreAzureBackup\n| where State =~ \"Deleted\"\n| where OperationName =~ \"BackupItem\"\n| extend data = split(BackupItemUniqueId, \";\")\n| extend AzureLocation = data[0], VaultId=data[1], HostName=tolower(tostring(data[2])), DrivesBackedUp=data[3]\n| project timestamp = TimeGenerated, AzureLocation, VaultId, HostName, DrivesBackedUp, State, BackupItemUniqueId, _ResourceId, OperationName, BackupItemFriendlyName\n)\non HostName\n| project timestamp, AlertName, HostName, DnsDomain, UserName, NTDomain, _ResourceId, IpAddress, VaultId, AzureLocation, DrivesBackedUp, State, BackupItemUniqueId, OperationName, BackupItemFriendlyName\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"techniques": [
"T1496"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}