DSInternals Suspicious PowerShell Cmdlets
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About the rule
Rule Type
Standard
Rule Description
Detects execution and usage of the DSInternals PowerShell module. Which can be used to perform what might be considered as suspicious activity such as dumping DPAPI backup keys or manipulating NTDS.DIT files. The DSInternals PowerShell Module exposes several internal features of Active Directory and Azure Active Directory. These include FIDO2 and NGC key auditing, offline ntds.dit file manipulation, password auditing, DC recovery from IFM backups and password hash calculation.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND COMMANDLINE contains "Add-ADDBSidHistory,Add-ADNgcKey,Add-ADReplNgcKey,ConvertFrom-ADManagedPasswordBlob,ConvertFrom-GPPrefPassword,ConvertFrom-ManagedPasswordBlob,ConvertFrom-UnattendXmlPassword,ConvertFrom-UnicodePassword,ConvertTo-AADHash,ConvertTo-GPPrefPassword,ConvertTo-KerberosKey,ConvertTo-LMHash,ConvertTo-MsoPasswordHash,ConvertTo-NTHash,ConvertTo-OrgIdHash,ConvertTo-UnicodePassword,Disable-ADDBAccount,Enable-ADDBAccount,Get-ADDBAccount,Get-ADDBBackupKey,Get-ADDBDomainController" OR COMMANDLINE contains "Get-ADDBGroupManagedServiceAccount,Get-ADDBKdsRootKey,Get-ADDBSchemaAttribute,Get-ADDBServiceAccount,Get-ADDefaultPasswordPolicy,Get-ADKeyCredential,Get-ADPasswordPolicy,Get-ADReplAccount,Get-ADReplBackupKey,Get-ADReplicationAccount,Get-ADSIAccount,Get-AzureADUserEx,Get-BootKey,Get-KeyCredential,Get-LsaBackupKey,Get-LsaPolicy,Get-SamPasswordPolicy,Get-SysKey,Get-SystemKey,New-ADDBRestoreFromMediaScript,New-ADKeyCredential" OR COMMANDLINE contains "New-ADNgcKey,New-NTHashSet,Remove-ADDBObject,Save-DPAPIBlob,Set-ADAccountPasswordHash,Set-ADDBAccountPassword,Set-ADDBBootKey,Set-ADDBDomainController,Set-ADDBPrimaryGroup,Set-ADDBSysKey,Set-AzureADUserEx,Set-LsaPolicy,Set-SamAccountPasswordHash,Set-WinUserPasswordHash,Test-ADDBPasswordQuality,Test-ADPasswordQuality,Test-ADReplPasswordQuality,Test-PasswordQuality,Unlock-ADDBAccount,Write-ADNgcKey,Write-ADReplNgcKey" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Active Directory
Author
Nasreddine Bencherchali (Nextron Systems), Nounou Mbeiri
