cloudapkd 🛠️

dpapi::cloudapkd allows to decrypt via DPAPI the ProofOfPossesionKey (extracted from a Primary Refresh Token, a.k.a. PRT, e.g. cloudap) and thus recover the Clear key and the Derived Key.

  • /prt: Primary Refresh Token, used for JWT token generation (can be found with sekurlsa::cloudap)

  • /iat: Issued At, used for JWT token generation (Default: -112)

  • /pop: Proof-of-Possession (Unknown usage, Work In Progress)

  • /label: Object label, can be retrive from keyvalue with unprotect

  • /context: Used for JWT token generation (can be found with unprotect)

  • /keyname: Is necessary for opaque keys (when a TPM is used for example) during unprotect operation

  • /keyvalue: Part of ProofOfPossesionKey, can be found with sekurlsa::cloudap. Unprotect this data to retrieve context, label, clearkey and derivedkey

  • /derivedkey: used for JWT token generation (can be found with unprotect)

  • /unprotect: Decrypt the secret from DPAPI (masterkey is optionnal, but token::elevate is required)

  • /masterkey: master DPAPI key use to unprotect the secret (can be retrieved from sekurlsa::dpapi). This field is not mandatory, if absent the key will be found automatically

References

LogoJourney to Azure AD PRT: Getting access with pass-the-token and pass-the-cert
LogoLateral Movement to the Cloud with Pass-the-PRTStealthbits Technologies
Digging further into the Primary Refresh Tokendirkjanm.io
LogoPass-the-PRT attack and detection by Microsoft Defender for ….Medium
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