BATTLE OF SKM AND IUM

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CORE IUM-EXPOSED SKM SERVICES • SKM provides three basic services to Trustlets • Secured Identification (using the IDK and Trustlet Instance GUIDs) • Secured Communication (using Mailboxes and Secure Blobs) • Secured Cryptography • These basic services are implemented through the system call interface • syscall instruction on x64 • Following the standard Windows NT model, Trustlets interact with a “base” (Subsystem) DLL, which in turn calls the “native” DLL Trustlet IUM Base IUM DLL
SECURE SYSTEM CALLS • SKM exposes six system calls that have their high bit set • 0x80000000 – IumGetIdk • 0x80000001 – IumSetTrustletInstance • 0x80000003 – IumCrypto • 0x80000002 – IumPostMailbox • 0x80000004 – IumStoragePut • 0x80000005 – IumStorageGet Identification Cryptography Communications • The IumCrypto API internally exposes five different subcalls • System Calls are exported by the Native DLL (IUMDLL.DLL)
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: IUM INTERNALS
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 and 50: TRUSTLET INSTANCE GUID • Trustlet
Page 51 and 52: LSA TRUSTLET • One of the two inb
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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