Potential Fodhelper UAC Bypass

id: 56f3f35c-3aca-4437-a1fb-b7a84dc4af00
name: Potential Fodhelper UAC Bypass
description: |
  'This detection looks for the steps required to conduct a UAC bypass using Fodhelper.exe. By default this detection looks for the setting of the required registry keys and the invoking of the process within 1 hour - this can be tweaked as required.'
severity: Medium
requiredDataConnectors:
  - connectorId: SecurityEvents
    dataTypes:
      - SecurityEvent
  - connectorId: WindowsSecurityEvents
    dataTypes:
      - SecurityEvent
queryFrequency: 2h
queryPeriod: 2h
triggerOperator: gt
triggerThreshold: 0
status: Available
tactics:
  - PrivilegeEscalation
relevantTechniques:
  - T1548.002
query: |
  SecurityEvent
    | where EventID == 4657
    | parse ObjectName with "\\REGISTRY\\" KeyPrefix "\\" RegistryKey
    | project-reorder RegistryKey
    | where RegistryKey has "Software\\Classes\\ms-settings\\shell\\open\\command"
    | extend TimeKey = bin(TimeGenerated, 1h)
    | join (
    SecurityEvent
    | where EventID == 4688
    | where Process =~ "fodhelper.exe"
    | where ParentProcessName endswith "cmd.exe" or ParentProcessName endswith "powershell.exe" or ParentProcessName endswith "powershell_ise.exe"
    | extend TimeKey = bin(TimeGenerated, 1h)) on TimeKey, Computer
    | extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
    | extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
    | extend AccountName = tostring(split(TargetAccount, @'\')[1]), AccountNTDomain = tostring(split(TargetAccount, @'\')[0])
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: FullName
        columnName: Computer
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: HostNameDomain
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: TargetAccount
      - identifier: Name
        columnName: AccountName
      - identifier: NTDomain
        columnName: AccountNTDomain
version: 1.0.2
kind: Scheduled