04eefdf4-448d-45bb-87fc-93f263fc77f4

driver_668c5bea.sys :inline :inline

Description

Sophos, from time to time, has observed a threat actor deploy variants of Poortry on different machines within a single estate during an attack. These variants contain the same payload, but signed with a different certificate than the driver first seen used during the attack.

  • UUID: 04eefdf4-448d-45bb-87fc-93f263fc77f4
  • Created: 2024-09-10
  • Author: Michael Haag
  • Acknowledgement: |

DownloadBlock

This download link contains the malicious driver!

Commands

sc.exe create driver_fdd16a94.sys binPath=C:\windows\temp\driver_fdd16a94.sys type=kernel && sc.exe start driver_fdd16a94.sys
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

Sigma 🛡️

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Names

detects loading using name only

Hashes

detects loading using hashes only

Sysmon 🔎

Expand

Block

on hashes

Alert

on hashes

Resources


  • https://news.sophos.com/en-us/2024/08/27/burnt-cigar-2/

    • Known Vulnerable Samples

    PropertyValue
    Filename
    Creation Timestamp2024-08-17 01:38:43
    MD55983eaf01499c65f35302cd962b849f5
    SHA106b733b2b02753089d743793232bd326204b8919
    SHA256668c5bead3c7fcd919afd742ede7e5fe07972dc4cf730ff37deabdd22d88de4a
    Authentihash MD51651be97f95e7572cfdd3024800b7f1d
    Authentihash SHA1fd936a868fc6732c8e67e92503380cd44ec5ec28
    Authentihash SHA256f43b0b9a1d1445ba66e8370397cb22142439fa4062b7b05e30f9b26a370d767c
    RichPEHeaderHash MD581971eeb06082b3023a0ac0b1bde9d5f
    RichPEHeaderHash SHA11808b57806bd8bf2d5d4a78bf9c598b8897194b3
    RichPEHeaderHash SHA2560e7e804f08dc03c15f5efb550abb263dd01a16108a63a50a8d58cf2954edf2e8

    Download

    Certificates

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    Certificate 4efa7e7bba65ec1ab774f2b31357d599
    FieldValue
    ToBeSigned (TBS) MD5f830820e8290f2defa077743ca6e7357
    ToBeSigned (TBS) SHA10b11022d5c65f12b15ea49da29c45a3bd51ff17b
    ToBeSigned (TBS) SHA256c3bf6618b96463285ef2dabd06f631513585742cd9f2be85513f4d3763710211
    SubjectC=CN, ST=Guangdong, L=Shenzhen, O=Shenzhen yundian Technology Co., Ltd, CN=Shenzhen yundian Technology Co., Ltd
    ValidFrom2013-05-20 00:00:00
    ValidTo2014-05-20 23:59:59
    Signature1bae8106004f1ac2702bdcc897bf58debba45fca9d2c72082a3b54ef4a9df3dcbcd1468b1b588d975274ce37c3cbef125a8e334b1c6111e3ffc94eaf9c123b933c93352677f50c077cb8c771b94b21ef4fa882925a14fc580773ed66b54d49f668498e89047687bcc821385abf6ff579af7ab7dc45c60f270476e82fda4176ba85e9a29aa6f747aff19bd13ea0bc850d883e9681e53c5d5f97cb43af98514271b5a90efe591c7ea52aafa4a902fff0904690cd974625557e170b02aa4724010c4b614995ffa54687584f0a09f47e777931c0f132a3836ef31c55310bde34b10bf3cc5a7a546e2432c18645edbf018da59f8be29d4d334be3b78daa6dd35abc70
    SignatureAlgorithmOID1.2.840.113549.1.1.5
    IsCertificateAuthorityFalse
    SerialNumber4efa7e7bba65ec1ab774f2b31357d599
    Version3
    Certificate 47974d7873a5bcab0d2fb370192fce5e
    FieldValue
    ToBeSigned (TBS) MD5e3a93dc2a8a8a668fdbb286bfe9afab5
    ToBeSigned (TBS) SHA195795d2aa2a554a423bc8c6e5b0a016d14887d35
    ToBeSigned (TBS) SHA256d8844186775bddbccaf3dc017064df7d760fd4b85c5d07561a3efd7da950f89e
    SubjectC=US, O=Thawte, Inc., CN=Thawte Code Signing CA , G2
    ValidFrom2010-02-08 00:00:00
    ValidTo2020-02-07 23:59:59
    Signature56fe535ce1c79ebca7ed7e536d6a144b518c405e805faaa4e82fef38c804c9ca3ecfdf3a584eb0d4b663c52957fa02059a454d68db2a1bd4343d9f00c35acb9549a56ee1b0c5fc414d414a6fd377c8d7388de419de18f31f1565836d450c53f90a9a2ea55dbf6f32811892196a5500ad631c52067e55d92968ae4a7c189a79886b2323d827382a298776cafbc7b662231fed7a564cdd9c325bf53d0c4618953b2a2368836441d9006d0f1924156872bdc571676eac4cdb90eb51a51a6207d0be6a00473c722fec4f613e7385ce5a0ab7bac01c1375e3223928dd6d1d09469d4fbae8408191c6a4ce94721b01cf2a6e15679589ae7db7b7cdf90a3d75b66b3c25
    SignatureAlgorithmOID1.2.840.113549.1.1.5
    IsCertificateAuthorityTrue
    SerialNumber47974d7873a5bcab0d2fb370192fce5e
    Version3
    Certificate 611fb0a400000000001d
    FieldValue
    ToBeSigned (TBS) MD5a3f222107d4e1085e73b5b589c2f480b
    ToBeSigned (TBS) SHA1b94aa26cd77c48d91a53ac44506cbd255e1d362c
    ToBeSigned (TBS) SHA256a39ed0d6fd4eb1a6f7fed60f726e23eae668b7591bc004644625d22c701213fa
    SubjectC=US, O=thawte, Inc., OU=Certification Services Division, OU=(c) 2006 thawte, Inc. , For authorized use only, CN=thawte Primary Root CA
    ValidFrom2011-02-22 19:31:57
    ValidTo2021-02-22 19:41:57
    Signature2dcc71b5e8ba94ff5ee64467007b6afc412c3ee70e41855ab12a932ba95b89f2f72b499c8003f297b8e760a80ed7fd5de545467594f4ed1c9de166228b61fb29f2c6a8bdf387c98f7f47e1c058b64a1aa2e7f718606969e083069e26c775c40c0d79da746b52b9fae8ea3359b9bb18dd291a14dfd36a37277a9da0dacffffc22c4faf009ff33e93e17ba1cc742cfce2743d30c0c5581303db96060ce02ece19ee81ddc852ce0a18d966d95ac17a4713ea16741b6281d2ce3b615e5b7e5a2f6256d86e320acf9f8314f8e629b9833376d6af735523e90feb03b5fc5b852a9e06ea0479a279e97aea24a9e531939ec357ec659de3ae0aaf533f06abda0821812dea18c4570ca2bd62e959145995a5c240049bd23b30ceca43df5b9e1d1b1825a38eea3fba1ab483a8c5dffa065223fd3d3fe4990db1446a3852e8a554b09ab38b2ab63a008d1fdad48e273d812bcc26ca516fad09ac05e38383a2b718e553aac42197a1f0d4220e7ab5d8c6880524ca1c0d488d02321fb901309007b4937afa9df486022abf4f6c2363bf8513c34bbc586e43ae19f4b90fe5461024b159c34176aa94b8d4cb69d2326c83af1d6b805cdda1d6240183a2f1b41cd3a993a0aa9d1d77eb8c4aff7b8c980105ed55df6ce7a9a02c50f6381efb564e9fc5bd8d2619a68c37cf9c78df91e87d5fa2cf816ae9dab068fc86dc741cda14e84e3dac26ebcfb
    SignatureAlgorithmOID1.2.840.113549.1.1.5
    IsCertificateAuthorityTrue
    SerialNumber611fb0a400000000001d
    Version3

    Imports

    Expand
    • FLTMGR.SYS
    • ntoskrnl.exe

    Imported Functions

    Expand
    • FltUnregisterFilter
    • FltCreateCommunicationPort
    • FltCloseCommunicationPort
    • FltCloseClientPort
    • FltBuildDefaultSecurityDescriptor
    • FltFreeSecurityDescriptor
    • FltRegisterFilter
    • wcsrchr
    • RtlInitUnicodeString
    • RtlWriteRegistryValue
    • RtlCreateRegistryKey
    • DbgPrintEx
    • MmIsAddressValid
    • _vsnwprintf
    • wcsstr
    • KeInitializeEvent
    • KeSetEvent
    • KeWaitForSingleObject
    • ExAllocatePool
    • ExFreePoolWithTag
    • IoAllocateIrp
    • IofCallDriver
    • IoFreeIrp
    • IoFreeMdl
    • IoGetCurrentProcess
    • IoGetRelatedDeviceObject
    • IoSetCompletionRoutineEx
    • ObReferenceObjectByHandle
    • ObfDereferenceObject
    • ZwCreateFile
    • ZwOpenFile
    • ZwWriteFile
    • ZwClose
    • ZwOpenKey
    • ZwQueryValueKey
    • KeStackAttachProcess
    • KeUnstackDetachProcess
    • IoFileObjectType
    • RtlInitAnsiString
    • MmGetSystemRoutineAddress
    • RtlAnsiStringToUnicodeString
    • RtlCompareUnicodeString
    • RtlFreeAnsiString
    • RtlGetVersion
    • MmGetPhysicalMemoryRanges
    • MmGetPhysicalAddress
    • MmCopyMemory
    • MmGetVirtualForPhysical
    • PsSetCreateProcessNotifyRoutine
    • PsGetProcessId
    • PsLookupProcessByProcessId
    • ObOpenObjectByPointer
    • PsGetProcessPeb
    • __C_specific_handler
    • PsProcessType

    Exported Functions

    Expand

    Sections

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

    Signature

    Expand
    {
  "Certificates": [
    {
      "IsCertificateAuthority": false,
      "SerialNumber": "4efa7e7bba65ec1ab774f2b31357d599",
      "Signature": "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",
      "SignatureAlgorithmOID": "1.2.840.113549.1.1.5",
      "Subject": "C=CN, ST=Guangdong, L=Shenzhen, O=Shenzhen yundian Technology Co., Ltd, CN=Shenzhen yundian Technology Co., Ltd",
      "TBS": {
        "MD5": "f830820e8290f2defa077743ca6e7357",
        "SHA1": "0b11022d5c65f12b15ea49da29c45a3bd51ff17b",
        "SHA256": "c3bf6618b96463285ef2dabd06f631513585742cd9f2be85513f4d3763710211",
        "SHA384": "c6079686cb82480e766a96ebe62d3a61fbf6e7dbbfb79248c0ac191dfe30b2e0017868a50f03a73caef4b8f730f6e014"
      },
      "ValidFrom": "2013-05-20 00:00:00",
      "ValidTo": "2014-05-20 23:59:59",
      "Version": 3
    },
    {
      "IsCertificateAuthority": true,
      "SerialNumber": "47974d7873a5bcab0d2fb370192fce5e",
      "Signature": "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",
      "SignatureAlgorithmOID": "1.2.840.113549.1.1.5",
      "Subject": "C=US, O=Thawte, Inc., CN=Thawte Code Signing CA , G2",
      "TBS": {
        "MD5": "e3a93dc2a8a8a668fdbb286bfe9afab5",
        "SHA1": "95795d2aa2a554a423bc8c6e5b0a016d14887d35",
        "SHA256": "d8844186775bddbccaf3dc017064df7d760fd4b85c5d07561a3efd7da950f89e",
        "SHA384": "78d972495720b43a6470b18ae1226bcca20707628087717a9364c14ca053ba264e6d149718b103542d9942200138a69d"
      },
      "ValidFrom": "2010-02-08 00:00:00",
      "ValidTo": "2020-02-07 23:59:59",
      "Version": 3
    },
    {
      "IsCertificateAuthority": true,
      "SerialNumber": "611fb0a400000000001d",
      "Signature": "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",
      "SignatureAlgorithmOID": "1.2.840.113549.1.1.5",
      "Subject": "C=US, O=thawte, Inc., OU=Certification Services Division, OU=(c) 2006 thawte, Inc. , For authorized use only, CN=thawte Primary Root CA",
      "TBS": {
        "MD5": "a3f222107d4e1085e73b5b589c2f480b",
        "SHA1": "b94aa26cd77c48d91a53ac44506cbd255e1d362c",
        "SHA256": "a39ed0d6fd4eb1a6f7fed60f726e23eae668b7591bc004644625d22c701213fa",
        "SHA384": "64b7643e4146016cbf83c911eb67e4601b6bb8d66f8ee8dcee67b815f91770d86ab23678b984430f22a963e5484881b7"
      },
      "ValidFrom": "2011-02-22 19:31:57",
      "ValidTo": "2021-02-22 19:41:57",
      "Version": 3
    }
  ],
  "CertificatesInfo": "",
  "Signer": [
    {
      "Issuer": "C=US, O=Thawte, Inc., CN=Thawte Code Signing CA , G2",
      "SerialNumber": "4efa7e7bba65ec1ab774f2b31357d599",
      "Version": 1
    }
  ],
  "SignerInfo": ""
}

    source

    last_updated: 2025-01-13