Detect Malicious Usage of Recovery Tools to Delete Backup Files
| Id | 259de2c1-c546-4c6d-a17c-df639722f4d7 |
| Rulename | Detect Malicious Usage of Recovery Tools to Delete Backup Files |
| Description | This analytic rule detects usage of recovery tools vssadmin, wbadmin, wmic and bcedit to delete backup files or change recovery configuration. Adversaries may use these tools to delete shadow copies and backup files to prevent recovery of files. https://attack.mitre.org/techniques/T1490/ |
| Severity | High |
| Tactics | Impact |
| Techniques | T1490 |
| Required data connectors | CiscoSecureEndpoint CrowdStrikeFalconEndpointProtection MicrosoftThreatProtection SentinelOne TrendMicroApexOne TrendMicroApexOneAma VMwareCarbonBlack |
| Kind | Scheduled |
| Query frequency | 1h |
| Query period | 1h |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/BackupDeletionDetected.yaml |
| Version | 1.0.0 |
| Arm template | 259de2c1-c546-4c6d-a17c-df639722f4d7.json |
_ASim_ProcessEvent
| where TargetProcessFilename has_any ('vssadmin.exe', 'wbadmin.exe', 'wmic.exe')
| where CommandLine has_all ('delete', 'shadow')
| union isfuzzy=True
(_ASim_ProcessEvent
| where TargetProcessFilename =~ 'bcedit.exe'
| where CommandLine has_all ('/set', 'recoveryenabled no')
)
| project
TimeGenerated,
DvcHostname,
DvcIpAddr,
DvcDomain,
TargetUsername,
TargetUsernameType,
TargetProcessName,
TargetProcessId,
CommandLine
| extend Username = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[1]), TargetUsername)
| extend NTDomain = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[0]), TargetUsername)
| extend Username = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[0]), Username)
| extend UPNSuffix = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[1]), '')
name: Detect Malicious Usage of Recovery Tools to Delete Backup Files
tags:
- SchemaVersion: 0.1.4
Schema: _ASim_ProcessEvent
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/BackupDeletionDetected.yaml
queryPeriod: 1h
version: 1.0.0
kind: Scheduled
id: 259de2c1-c546-4c6d-a17c-df639722f4d7
triggerOperator: gt
triggerThreshold: 0
relevantTechniques:
- T1490
requiredDataConnectors:
- dataTypes:
- CommonSecurityLog
connectorId: CrowdStrikeFalconEndpointProtection
- dataTypes:
- SecurityAlert
connectorId: MicrosoftThreatProtection
- dataTypes:
- SentinelOne_CL
connectorId: SentinelOne
- dataTypes:
- CarbonBlackEvents_CL
connectorId: VMwareCarbonBlack
- dataTypes:
- CiscoSecureEndpoint_CL
connectorId: CiscoSecureEndpoint
- dataTypes:
- TMApexOneEvent
connectorId: TrendMicroApexOne
- dataTypes:
- TMApexOneEvent
connectorId: TrendMicroApexOneAma
eventGroupingSettings:
aggregationKind: AlertPerResult
severity: High
description: |
This analytic rule detects usage of recovery tools vssadmin, wbadmin, wmic and bcedit to delete backup files or change recovery configuration. Adversaries may use these tools to delete shadow copies and backup files to prevent recovery of files.
https://attack.mitre.org/techniques/T1490/
alertDetailsOverride:
alertDescriptionFormat: 'A system tool {{TargetProcessName}} ProcessId: ({{TargetProcessId}}) with {{CommandLine}} used to delete backup files.'
alertDisplayNameFormat: Tool {{TargetProcessName}} used to delete backup files on {{DvcHostname}} by {{TargetUsername}}
query: |
_ASim_ProcessEvent
| where TargetProcessFilename has_any ('vssadmin.exe', 'wbadmin.exe', 'wmic.exe')
| where CommandLine has_all ('delete', 'shadow')
| union isfuzzy=True
(_ASim_ProcessEvent
| where TargetProcessFilename =~ 'bcedit.exe'
| where CommandLine has_all ('/set', 'recoveryenabled no')
)
| project
TimeGenerated,
DvcHostname,
DvcIpAddr,
DvcDomain,
TargetUsername,
TargetUsernameType,
TargetProcessName,
TargetProcessId,
CommandLine
| extend Username = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[1]), TargetUsername)
| extend NTDomain = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[0]), TargetUsername)
| extend Username = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[0]), Username)
| extend UPNSuffix = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[1]), '')
tactics:
- Impact
entityMappings:
- entityType: Host
fieldMappings:
- columnName: DvcHostname
identifier: HostName
- columnName: DvcDomain
identifier: DnsDomain
- columnName: NTDomain
identifier: NTDomain
- entityType: IP
fieldMappings:
- columnName: DvcIpAddr
identifier: Address
- entityType: Account
fieldMappings:
- columnName: Username
identifier: Name
- columnName: UPNSuffix
identifier: UPNSuffix
- columnName: NTDomain
identifier: NTDomain
- entityType: Process
fieldMappings:
- columnName: TargetProcessId
identifier: ProcessId
- columnName: CommandLine
identifier: CommandLine
status: Available
queryFrequency: 1h
{
"$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/259de2c1-c546-4c6d-a17c-df639722f4d7')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/259de2c1-c546-4c6d-a17c-df639722f4d7')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "A system tool {{TargetProcessName}} ProcessId: ({{TargetProcessId}}) with {{CommandLine}} used to delete backup files.",
"alertDisplayNameFormat": "Tool {{TargetProcessName}} used to delete backup files on {{DvcHostname}} by {{TargetUsername}}"
},
"alertRuleTemplateName": "259de2c1-c546-4c6d-a17c-df639722f4d7",
"customDetails": null,
"description": "This analytic rule detects usage of recovery tools vssadmin, wbadmin, wmic and bcedit to delete backup files or change recovery configuration. Adversaries may use these tools to delete shadow copies and backup files to prevent recovery of files.\nhttps://attack.mitre.org/techniques/T1490/\n",
"displayName": "Detect Malicious Usage of Recovery Tools to Delete Backup Files",
"enabled": true,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "DvcHostname",
"identifier": "HostName"
},
{
"columnName": "DvcDomain",
"identifier": "DnsDomain"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "DvcIpAddr",
"identifier": "Address"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Username",
"identifier": "Name"
},
{
"columnName": "UPNSuffix",
"identifier": "UPNSuffix"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Process",
"fieldMappings": [
{
"columnName": "TargetProcessId",
"identifier": "ProcessId"
},
{
"columnName": "CommandLine",
"identifier": "CommandLine"
}
]
}
],
"eventGroupingSettings": {
"aggregationKind": "AlertPerResult"
},
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/BackupDeletionDetected.yaml",
"query": "_ASim_ProcessEvent\n| where TargetProcessFilename has_any ('vssadmin.exe', 'wbadmin.exe', 'wmic.exe')\n| where CommandLine has_all ('delete', 'shadow')\n| union isfuzzy=True \n (_ASim_ProcessEvent\n | where TargetProcessFilename =~ 'bcedit.exe'\n | where CommandLine has_all ('/set', 'recoveryenabled no')\n )\n| project\n TimeGenerated,\n DvcHostname,\n DvcIpAddr,\n DvcDomain,\n TargetUsername,\n TargetUsernameType,\n TargetProcessName,\n TargetProcessId,\n CommandLine\n| extend Username = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\\\')[1]), TargetUsername)\n| extend NTDomain = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\\\')[0]), TargetUsername)\n| extend Username = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[0]), Username)\n| extend UPNSuffix = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[1]), '')\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "High",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"tags": [
{
"Schema": "_ASim_ProcessEvent",
"SchemaVersion": "0.1.4"
}
],
"techniques": [
"T1490"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}