Test‐IsADUserPasswordCompromised

ryannewington edited this page Jan 27, 2019 · 2 revisions

Description

The Test-IsADUserPasswordCompromised cmdlet will extract the current password hash from Active Directory for the specified user, and check to see if it exists in the compromised password store.

This cmdlet must be executed by a user in the Domain Admins group, or by a user who holds the Replicate Directory Changes All permission on the domain containing the user to test.

Performing this action is a security-sensitive operation, and should only be performed from trusted devices within the domain.

This cmdlet does not require the password filter to be registered with LSASS, but it does require direct access to the store. The cmdlet will not check the password against other password policy settings. It only checks to see if the password hash is located in the compromised password store.

Syntax

# Test a user's password using their username and domain name
Test-IsADUserPasswordCompromised -AccountName <string> -DomainName <string> -Server <string> -Credential <PSCredential> [-OutputCompromisedHashOnMatch]

# Test a user's password using their UPN
Test-IsADUserPasswordCompromised -Upn <string> -Server <string> -Credential <PSCredential> [-OutputCompromisedHashOnMatch]

# Test a user's password using the string representation of their SID
Test-IsADUserPasswordCompromised -Sid <string> -Server <string> -Credential <PSCredential> [-OutputCompromisedHashOnMatch]

Parameters

AccountName

Required. The samAccountName of the user who's password should be tested.

Domain

Required. The domain of the user who's password should be tested.

Upn

Required. The userPrincipalName attribute of the user who's password should be tested.

Sid

Required. The string-representation of the SID of the user who's password should be tested.

Server

Optional. The server to retrieve the password hash from. If omitted, the cmdlet will use the value of the logged on-user's UserDNSDomain environment variable.

Credential

Optional. The credentials to use to retrieve the password has from the directory. If omitted, the credentials of the currently logged on user are used.

OutputCompromisedHashOnMatch

The cmdlet ordinarily returns a $true $false value to indicate if the password is in the store. If this switch is specified, the cmdlet will output the raw NTLM hash when a match is found in the store, and nothing if there was no match.

Return value

The cmdlet returns a boolean value indicating whether the user's password was found in the compromised password store. However, if the OutputCompromisedHashOnMatch switch is specified, and the user's password was found in the compromised password store, the cmdlet will return the compromised password hash in hex format.

Examples

Test a user password using the default credentials against the default domain

PS> Test-IsADUserPasswordCompromised -AccountName ryan -DomainName lithnet
True

Test a user password using the UPN of the user

PS> Test-IsADUserPasswordCompromised -Upn ryan@lithnet.io
True

Test a user password using the SID of the user

PS> Test-IsADUserPasswordCompromised -Sid S-1-5-23423432-2343243211-44423
True

Test a user password, specifying a server name and prompting for credentials for the operation

PS> Test-IsADUserPasswordCompromised -Upn ryan@lithnet.io -Server dc1.lithnet.local -Credentials (Get-Credential)
False

Test a user password using the samAccountName of the user, and return the hash if a compromised password was detected

# cmdlet returns the hash when a compromised password was found
PS> Test-IsADUserPasswordCompromised -AccountName ryan -Domain lithnet -OutputCompromisedHashOnMatch
8846f7eaee8fb117ad06bdd830b7586c

# cmdlet returns nothing if the password isn't compromised
PS> Test-IsADUserPasswordCompromised -AccountName bob -Domain lithnet -OutputCompromisedHashOnMatch
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