fda3ff67-12dc-488c-a4c2-603f5bf420bd

cg6kwin2k.sys :inline

Description

The Carbon Black Threat Analysis Unit (TAU) discovered 34 unique vulnerable drivers (237 file hashes) accepting firmware access. Six allow kernel memory access. All give full control of the devices to non-admin users. By exploiting the vulnerable drivers, an attacker without the system privilege may erase/alter firmware, and/or elevate privileges. As of the time of writing in October 2023, the filenames of the vulnerable drivers have not been made public until now.

  • UUID: fda3ff67-12dc-488c-a4c2-603f5bf420bd
  • Created: 2023-11-02
  • Author: Takahiro Haruyama
  • Acknowledgement: |

Download

This download link contains the vulnerable driver!

Commands

sc.exe create cg6kwin2ksys binPath= C:\windows\temp\cg6kwin2ksys.sys type=kernel && sc.exe start cg6kwin2ksys
Use CasePrivilegesOperating System
Elevate privilegeskernelWindows 10

Detections

YARA 🏹

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Exact Match

with header and size limitation

Threat Hunting

without header and size limitation

Renamed

for renamed driver files

Sigma 🛡️

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Names

detects loading using name only

Hashes

detects loading using hashes only

Sysmon 🔎

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Block

on hashes

Alert

on hashes

Resources


  • https://blogs.vmware.com/security/2023/10/hunting-vulnerable-kernel-drivers.html

  • Known Vulnerable Samples

    PropertyValue
    Filename
    Creation Timestamp2022-09-13 08:32:49
    MD5e3d290406de40c32095bd76dc88179fb
    SHA106ec62c590ca0f1f2575300c151c84640d2523c0
    SHA256223f61c3f443c5047d1aeb905b0551005a426f084b7a50384905e7e4ecb761a1
    Authentihash MD5fe2bb16274052394a433f202b2f2c556
    Authentihash SHA165980c174fc4930339ca81f70667439ad10b85cc
    Authentihash SHA2568c33314792854eef6c6cc4bd1cc4b00f1feed35e8bd260dd4ab0d93b1f6165af
    RichPEHeaderHash MD5174dcc1f4d118a31686a876b819a7f19
    RichPEHeaderHash SHA1d48fc38a407eaed8bfb247f89a2ad22d69da9e54
    RichPEHeaderHash SHA25675fd010ec23cdc46727239764006ce424df73edfcbbea22833eaf50d7d07b2a5
    CompanyNMS Communications
    DescriptionCG/MG family driver
    ProductCT Access
    OriginalFilenamecg6kwin2k.sys

    Download

    Certificates

    Expand
    Certificate 3300000057ee4d659a923e7c10000000000057
    FieldValue
    ToBeSigned (TBS) MD5fdc11a5676aed4e9cc0c09eeb7450dfb
    ToBeSigned (TBS) SHA14902077d9a05d4231b791d3b05bafa4a79132f03
    ToBeSigned (TBS) SHA2565db56c23d83bf67c7152e28ad4a684a7372b4ae4f52afe7a81ce91eef94caec3
    SubjectC=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Hardware Compatibility Publisher
    ValidFrom2022-06-07 18:08:06
    ValidTo2023-06-01 18:08:06
    Signature0a835e40cdb627d4f0a0d3dbbf64a46a05c132d0b5df9d11cd9c195d7037737057d57a342732ae68d67de47f460e7211c7c40dc29b0a079caff871c4834a9a2fc85e759de9b78659ad6fd79b7320e538e9ba5d52227ad67cc00b0a770ef662af3d743a558643ad89cfb015591709a69b6271a9b65db71898e7cb9964c6376dc474898301a6133198b486b518fdd9d7b9723dcffc441e026833f7c72e27986026c97b9184a0048b10d1fe6847ae467f02173f7a69120be780e5b6b9e6399402cc58735a31b537cc33578fbea443135a4a612359150bcf9ab316f6a9248bc71ef3f3480b9b3fa2341692bc3a121d80214688f7bd87d5ec56dcbd0ea61abf2c7ed2b739a07590adb596d401735d955f5f94c591d69ab4363a42f9fca549d439495711ff7990448c03724792ed4acf31f2b35b136c1b2f37aa82b1aabf7daf059dcb2e976e95311ec6e9cc53876dd09632cf512d39c801849a7c1088a565691953e07c7ff17b22518e982dd2dcc0feda8c834ca1f5e247aef1c3af5f13cd4b8cc1b6c0179bc876db88d677047c34366533e349796dbdea86389ad640710b7742ae8cc4ec88f10fa80ede4b1c93f81b55480fc8228216d54813df0327e74b3db9f3512a40c0568e4215827f9b7a2613deea72a7ec4df2def05e5559015049fe83edc83300526045cb128119e131b7d3573b268e24b0a25b9ad59f6301c8fc8f409322
    SignatureAlgorithmOID1.2.840.113549.1.1.11
    IsCertificateAuthorityFalse
    SerialNumber3300000057ee4d659a923e7c10000000000057
    Version3
    Certificate 330000000d690d5d7893d076df00000000000d
    FieldValue
    ToBeSigned (TBS) MD583f69422963f11c3c340b81712eef319
    ToBeSigned (TBS) SHA10c5e5f24590b53bc291e28583acb78e5adc95601
    ToBeSigned (TBS) SHA256d8be9e4d9074088ef818bc6f6fb64955e90378b2754155126feebbbd969cf0ae
    SubjectC=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014
    ValidFrom2014-10-15 20:31:27
    ValidTo2029-10-15 20:41:27
    Signature96b5c33b31f27b6ba11f59dd742c3764b1bca093f9f33347e9f95df21d89f4579ee33f10a3595018053b142941b6a70e5b81a2ccbd8442c1c4bed184c2c4bd0c8c47bcbd8886fb5a0896ae2c2fdfbf9366a32b20ca848a6945273f732332936a23e9fffdd918edceffbd6b41738d579cf8b46d499805e6a335a9f07e6e86c06ba8086725afc0998cdba7064d4093188ba959e69914b912178144ac57c3ae8eae947bcb3b8edd7ab4715bba2bc3c7d085234b371277a54a2f7f1ab763b94459ed9230cce47c099212111f52f51e0291a4d7d7e58f8047ff189b7fd19c0671dcf376197790d52a0fbc6c12c4c50c2066f50e2f5093d8cafb7fe556ed09d8a753b1c72a6978dcf05fe74b20b6af63b5e1b15c804e9c7aa91d4df72846782106954d32dd6042e4b61ac4f24636de357302c1b5e55fb92b59457a9243d7c4e963dd368f76c728caa8441be8321a66cde5485c4a0a602b469206609698dcd933d721777f886dac4772daa2466eab64682bd24e98fb35cc7fec3f136d11e5db77edc1c37e1f6a4a14f8b4a721c671866770cdd819a35d1fa09b9a7cc55d4d728e74077fa74d00fcdd682412772a557527cda92c1d8e7c19ee692c9f7425338208db38cc7cc74f6c3a6bc237117872fe55596460333e2edfc42de72cd7fb0a82256fb8d70c84a5e1c4746e2a95329ea0fecdb4188fd33bad32b2b19ab86d0543fbff0d0f
    SignatureAlgorithmOID1.2.840.113549.1.1.11
    IsCertificateAuthorityTrue
    SerialNumber330000000d690d5d7893d076df00000000000d
    Version3

    Imports

    Expand
    • ntoskrnl.exe
    • HAL.dll

    Imported Functions

    Expand
    • IoDeleteSymbolicLink
    • ExFreePoolWithTag
    • RtlInitUnicodeString
    • IoDeleteDevice
    • RtlQueryRegistryValues
    • KeInitializeDpc
    • KeReleaseSpinLock
    • IoAllocateErrorLogEntry
    • KeInitializeTimer
    • KeSetTimerEx
    • RtlAppendUnicodeStringToString
    • IofCompleteRequest
    • RtlCopyUnicodeString
    • KeCancelTimer
    • KeAcquireSpinLockRaiseToDpc
    • IoCreateSymbolicLink
    • IoCreateDevice
    • KeSetEvent
    • swprintf
    • KeInitializeEvent
    • RtlUnicodeStringToAnsiString
    • MmUnmapIoSpace
    • PsCreateSystemThread
    • MmMapIoSpace
    • ZwClose
    • IoConnectInterrupt
    • ObReferenceObjectByHandle
    • KeWaitForSingleObject
    • RtlFreeAnsiString
    • ObfDereferenceObject
    • IoDisconnectInterrupt
    • IoWriteErrorLogEntry
    • IoGetDeviceObjectPointer
    • IoReleaseCancelSpinLock
    • KeDelayExecutionThread
    • PsTerminateSystemThread
    • KeReleaseSpinLockFromDpcLevel
    • KeAcquireSpinLockAtDpcLevel
    • KeQueryTimeIncrement
    • KeClearEvent
    • IoRegisterDeviceInterface
    • IoSetDeviceInterfaceState
    • IoBuildSynchronousFsdRequest
    • IoDetachDevice
    • RtlFreeUnicodeString
    • PoStartNextPowerIrp
    • IoGetAttachedDeviceReference
    • IoAttachDeviceToDeviceStack
    • PoCallDriver
    • IoGetDeviceProperty
    • IofCallDriver
    • MmFreeContiguousMemory
    • MmBuildMdlForNonPagedPool
    • IoFreeMdl
    • MmGetPhysicalAddress
    • IoAllocateMdl
    • MmAllocateContiguousMemory
    • KeInsertQueueDpc
    • RtlTimeToTimeFields
    • ExSystemTimeToLocalTime
    • KeBugCheckEx
    • MmMapLockedPagesSpecifyCache
    • ExAllocatePoolWithTag
    • KeStallExecutionProcessor

    Exported Functions

    Expand

    Sections

    Expand
    • .text
    • .rdata
    • .data
    • .pdata
    • INIT
    • .rsrc
    • .reloc

    Signature

    Expand
    {
      "Certificates": [
        {
          "IsCertificateAuthority": false,
          "SerialNumber": "3300000057ee4d659a923e7c10000000000057",
          "Signature": "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",
          "SignatureAlgorithmOID": "1.2.840.113549.1.1.11",
          "Subject": "C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Hardware Compatibility Publisher",
          "TBS": {
            "MD5": "fdc11a5676aed4e9cc0c09eeb7450dfb",
            "SHA1": "4902077d9a05d4231b791d3b05bafa4a79132f03",
            "SHA256": "5db56c23d83bf67c7152e28ad4a684a7372b4ae4f52afe7a81ce91eef94caec3",
            "SHA384": "c952d7f0e0ea5216ce4400601fb7c0829f0f3fcd6eb2b5b9112fbe45d133e00c4abd660f8e1794f7ac4ef95123e2c0ab"
          },
          "ValidFrom": "2022-06-07 18:08:06",
          "ValidTo": "2023-06-01 18:08:06",
          "Version": 3
        },
        {
          "IsCertificateAuthority": true,
          "SerialNumber": "330000000d690d5d7893d076df00000000000d",
          "Signature": "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",
          "SignatureAlgorithmOID": "1.2.840.113549.1.1.11",
          "Subject": "C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014",
          "TBS": {
            "MD5": "83f69422963f11c3c340b81712eef319",
            "SHA1": "0c5e5f24590b53bc291e28583acb78e5adc95601",
            "SHA256": "d8be9e4d9074088ef818bc6f6fb64955e90378b2754155126feebbbd969cf0ae",
            "SHA384": "260ad59ba706420f68ba212931153bd89f760c464b21be55fba9d014fff322407859d4ebfb78ea9a3330f60dc9821a63"
          },
          "ValidFrom": "2014-10-15 20:31:27",
          "ValidTo": "2029-10-15 20:41:27",
          "Version": 3
        }
      ],
      "CertificatesInfo": "",
      "Signer": [
        {
          "Issuer": "C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014",
          "SerialNumber": "3300000057ee4d659a923e7c10000000000057",
          "Version": 1
        }
      ],
      "SignerInfo": ""
    }
    

    source

    last_updated: 2023-12-22