BATTLE OF SKM AND IUM

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INBOX TRUSTLET IDS <strong>AND</strong> INSTANCE GUIDS • Trustlet ID 0 is the Secure Kernel Process, which hosts Device Guard • Trustlet ID 1 is LSAISO.EXE, which hosts Credential Guard • Trustlet ID 2 is VMSP.EXE which hosts the Virtual TPM (vTPM) on the Host Side • Uses the Instance GUID of the Hyper-V partition it is associated with to pull TPM secrets • Trustlet ID 3 is the vTPM provisioning tool • Uses the Instance GUID of the Hyper-V partition it is associated with to push TPM secrets • Enables Guarded Fabric feature
LSA TRUSTLET • One of the two inbox Trustlets on the system, LSAISO.EXE provides the Credential Guard feature of Windows 10 • Uses the DecryptData and EncryptData <strong>IUM</strong> Base API and nothing else • Communicates to the outside world using RPC • Its agent is LSASS.EXE, which runs as usual in Normal Mode • Provides support for encrypting Kerberos and NTLM secrets without visibility to an outside attacker without hypervisor/hardware exploits, as well as using Kerberos FAST to securely store and seal a Machine Key to prevent replay attacks and guarantee the provenance of the TGT
Page 1 and 2: BATTLE OF SKM AND IUM HOW WINDOWS 1
Page 3 and 4: PRESENTATION OVERVIEW • Microsoft
Page 5 and 6: VBS FEATURES IN WINDOWS 10 / SERVER
Page 7 and 8: ENABLING VBS
Page 9 and 10: HOW DOES IT ALL WORK? • Hyperviso
Page 11 and 12: SEPARATION OF ROLES • Instead of
Page 13 and 14: PLATFORM REQUIREMENTS • The Boot
Page 15 and 16: HARD CODE GUARANTEES • When hard
Page 17 and 18: VIRTUAL SECURE MODE (VSM) BOOTSTRAP
Page 19 and 20: SKM LAUNCH • To initialize VTL 1,
Page 21 and 22: BCD VSM POLICY OPTIONS • The poli
Page 23 and 24: SKM INTERNALS
Page 25 and 26: SKM STRUCTURES • SKM has a PCR at
Page 27 and 28: SKM CAPABILITIES • The SkCapabili
Page 29 and 30: SECURE MODE CALLS • Secure Mode C
Page 31 and 32: SPECIALIZED SECURE MORE SERVICE CAL
Page 33 and 34: NORMAL MODE SERVICE CALLS • SK ne
Page 35 and 36: IUM INTERNALS
Page 37 and 38: SECURE SYSTEM CALLS • SKM exposes
Page 39 and 40: SECURE BASE API • Trustlets shoul
Page 41 and 42: NOTABLY MISSING… • Trustlets ca
Page 43 and 44: NORMAL MODE SYSTEM CALL PROXYING Th
Page 45 and 46: LAUNCHING A TRUSTLET • Process At
Page 47 and 48: EXAMPLE IUM-COMPLIANT SIGNED BINARY
Page 49: TRUSTLET INSTANCE GUID • Trustlet
Page 53 and 54: LOADING A TRUSTLET • Ldr, or the
Page 55 and 56: TRUSTLET TO NORMAL WORLD COMMUNICAT
Page 57 and 58: CAN WE BUILD OUR OWN TRUSTLETS? •
Page 59 and 60: CONCLUSION RISKS AND THOUGHTS
Page 61 and 62: SECURE KERNEL COMPLEXITY / ATTACK S
Page 63 and 64: VSM WITHOUT SECUREBOOT • What’s
Page 65: YOU HAVE QUESTIONS? I HOPEFULLY HAV

BATTLE OF SKM AND IUM

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