Detect Malicious Usage of Recovery Tools to Delete Backup Files

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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

KQL

_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]), '')

YAML

queryFrequency: 1h
eventGroupingSettings:
  aggregationKind: AlertPerResult
id: 259de2c1-c546-4c6d-a17c-df639722f4d7
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/BackupDeletionDetected.yaml
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]), '')  
queryPeriod: 1h
kind: Scheduled
status: Available
relevantTechniques:
- T1490
name: Detect Malicious Usage of Recovery Tools to Delete Backup Files
triggerThreshold: 0
tags:
- Schema: _ASim_ProcessEvent
  SchemaVersion: 0.1.4
entityMappings:
- fieldMappings:
  - identifier: HostName
    columnName: DvcHostname
  - identifier: DnsDomain
    columnName: DvcDomain
  - identifier: NTDomain
    columnName: NTDomain
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: DvcIpAddr
  entityType: IP
- fieldMappings:
  - identifier: Name
    columnName: Username
  - identifier: UPNSuffix
    columnName: UPNSuffix
  - identifier: NTDomain
    columnName: NTDomain
  entityType: Account
- fieldMappings:
  - identifier: ProcessId
    columnName: TargetProcessId
  - identifier: CommandLine
    columnName: CommandLine
  entityType: Process
requiredDataConnectors:
- connectorId: CrowdStrikeFalconEndpointProtection
  dataTypes:
  - CommonSecurityLog
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - SecurityAlert
- connectorId: SentinelOne
  dataTypes:
  - SentinelOne_CL
- connectorId: VMwareCarbonBlack
  dataTypes:
  - CarbonBlackEvents_CL
- connectorId: CiscoSecureEndpoint
  dataTypes:
  - CiscoSecureEndpoint_CL
- connectorId: TrendMicroApexOne
  dataTypes:
  - TMApexOneEvent
- connectorId: TrendMicroApexOneAma
  dataTypes:
  - TMApexOneEvent
version: 1.0.0
severity: High
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}}
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/  
tactics:
- Impact

ARM