Analysis

  • max time kernel
    88s
  • max time network
    90s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    08-12-2024 14:59

Errors

Reason
Machine shutdown

General

  • Target

    Umbral.exe

  • Size

    229KB

  • MD5

    0cc2a414bb58a3f9e345ea56350ff9a4

  • SHA1

    09ec47af8c94ac3a94ad0e29df8a1405a6bc9e01

  • SHA256

    2ce5ab90e160d795bee80f40ab817b2beb35fb43845e61658942eda4ca0b376c

  • SHA512

    007ea98156043b18be5a612741ca9d2a0494dd5a5f7cea06a27185ac0de3950dd295d7e5066ea4313e3c517159b96450397e9645798fb2a2abd92ab8c21adccb

  • SSDEEP

    6144:tloZM0rIkd8g+EtXHkv/iD4eKbNoOJBiVHaIJtM9Xb8e1mgri:voZDL+EP8eKbNoOJBiVHaIJtMZ3m

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

    Umbral stealer is an opensource moduler stealer written in C#.

  • Umbral family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

  • Reads user/profile data of web browsers 3 TTPs

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

  • 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.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Modifies data under HKEY_USERS 15 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Umbral.exe
    "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5600
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2936
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1872
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:336
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1656
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3056
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1536
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:4988
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:3212
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
          2⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          PID:4524
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:5704
      • C:\Windows\System32\rundll32.exe
        C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
        1⤵
          PID:6100
        • C:\Program Files\VideoLAN\VLC\vlc.exe
          "C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Downloads\TestInstall.mov"
          1⤵
          • Suspicious behavior: AddClipboardFormatListener
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          • Suspicious use of SetWindowsHookEx
          PID:2352
        • C:\Windows\system32\LogonUI.exe
          "LogonUI.exe" /flags:0x4 /state0:0xa3a10855 /state1:0x41c64e6d
          1⤵
          • Modifies data under HKEY_USERS
          • Suspicious use of SetWindowsHookEx
          PID:3420

        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

          948B

          MD5

          45741c307af2576c6437c5fdb24ef9ce

          SHA1

          a6ba7a7705db14ac29a18a98dd7deb4cc759c3bf

          SHA256

          7887859f7179e194ff9b78f8d8fa3830790110a01597f21ff48c84cd935e49d2

          SHA512

          39fdc5931563cbf826e8b643b5f0dcdf45bb6f95a8eeb460499257ca41b3dbee4c692eaacc3fd33bddf4b6ff0c828981ed7e9cd080007bbb9f0b28e7d0d66941

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

          Filesize

          1KB

          MD5

          0ac871344dc49ae49f13f0f88acb4868

          SHA1

          5a073862375c7e79255bb0eab32c635b57a77f98

          SHA256

          688f15b59a784f6f4c62554f00b5d0840d1489cef989c18126c70dfee0806d37

          SHA512

          ace5c50303bd27998607cf34ac4322bcf5edfbd19bbb24309acf4d037b6f3f7636c7c14b6ac0b924114e036252d3a1b998951c7068f41548728fa5d92f5f9006

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

          Filesize

          1KB

          MD5

          83f6e5e020e57e01c9165d9085a35c1f

          SHA1

          eaf3331202b8d9e3cbcfbd05e2da74f449196639

          SHA256

          4ab76fb219a0d3ffb4e41b86a2a0544af4766585b331f96accfd18cc4b32c53b

          SHA512

          bd46fe0b1954bc06abf72b826619534a6110a3f9160c7e67ed0c820fbf100bc88fbcc89855d6b33fc5b6259621f9d8efe32be8a171be71c7503b7e934ff125c3

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ysimz1f5.uvt.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • memory/1872-11-0x00007FFFB4830000-0x00007FFFB52F2000-memory.dmp

          Filesize

          10.8MB

        • memory/1872-12-0x0000023F3D9B0000-0x0000023F3D9D2000-memory.dmp

          Filesize

          136KB

        • memory/1872-13-0x00007FFFB4830000-0x00007FFFB52F2000-memory.dmp

          Filesize

          10.8MB

        • memory/1872-14-0x00007FFFB4830000-0x00007FFFB52F2000-memory.dmp

          Filesize

          10.8MB

        • memory/1872-17-0x00007FFFB4830000-0x00007FFFB52F2000-memory.dmp

          Filesize

          10.8MB

        • memory/2352-106-0x00007FFFC5AD0000-0x00007FFFC5AE1000-memory.dmp

          Filesize

          68KB

        • memory/2352-86-0x00007FFFC9520000-0x00007FFFC9537000-memory.dmp

          Filesize

          92KB

        • memory/2352-122-0x00007FFFB31D0000-0x00007FFFB4280000-memory.dmp

          Filesize

          16.7MB

        • memory/2352-109-0x00000187A1860000-0x00000187A30CF000-memory.dmp

          Filesize

          24.4MB

        • memory/2352-95-0x00007FFFC5DA0000-0x00007FFFC5DC1000-memory.dmp

          Filesize

          132KB

        • memory/2352-96-0x00007FFFC5CE0000-0x00007FFFC5CF8000-memory.dmp

          Filesize

          96KB

        • memory/2352-97-0x00007FFFC5CC0000-0x00007FFFC5CD1000-memory.dmp

          Filesize

          68KB

        • memory/2352-98-0x00007FFFC5BA0000-0x00007FFFC5BB1000-memory.dmp

          Filesize

          68KB

        • memory/2352-100-0x00007FFFC5B60000-0x00007FFFC5B7B000-memory.dmp

          Filesize

          108KB

        • memory/2352-83-0x00007FFFC5FE0000-0x00007FFFC6014000-memory.dmp

          Filesize

          208KB

        • memory/2352-82-0x00007FF6E9F80000-0x00007FF6EA078000-memory.dmp

          Filesize

          992KB

        • memory/2352-90-0x00007FFFC5EB0000-0x00007FFFC5ECD000-memory.dmp

          Filesize

          116KB

        • memory/2352-91-0x00007FFFC5DD0000-0x00007FFFC5DE1000-memory.dmp

          Filesize

          68KB

        • memory/2352-89-0x00007FFFC5F80000-0x00007FFFC5F91000-memory.dmp

          Filesize

          68KB

        • memory/2352-88-0x00007FFFC6A60000-0x00007FFFC6A77000-memory.dmp

          Filesize

          92KB

        • memory/2352-93-0x00007FFFC5BC0000-0x00007FFFC5C01000-memory.dmp

          Filesize

          260KB

        • memory/2352-92-0x00007FFFB4280000-0x00007FFFB448B000-memory.dmp

          Filesize

          2.0MB

        • memory/2352-87-0x00007FFFC6C40000-0x00007FFFC6C51000-memory.dmp

          Filesize

          68KB

        • memory/2352-84-0x00007FFFB4E80000-0x00007FFFB5136000-memory.dmp

          Filesize

          2.7MB

        • memory/2352-101-0x00007FFFC5B40000-0x00007FFFC5B51000-memory.dmp

          Filesize

          68KB

        • memory/2352-85-0x00007FFFCA8F0000-0x00007FFFCA908000-memory.dmp

          Filesize

          96KB

        • memory/2352-99-0x00007FFFC5B80000-0x00007FFFC5B91000-memory.dmp

          Filesize

          68KB

        • memory/2352-104-0x00007FFFC15B0000-0x00007FFFC1617000-memory.dmp

          Filesize

          412KB

        • memory/2352-108-0x00007FFFB5400000-0x00007FFFB542C000-memory.dmp

          Filesize

          176KB

        • memory/2352-107-0x00007FFFC11E0000-0x00007FFFC1237000-memory.dmp

          Filesize

          348KB

        • memory/2352-94-0x00007FFFB31D0000-0x00007FFFB4280000-memory.dmp

          Filesize

          16.7MB

        • memory/2352-105-0x00007FFFC1530000-0x00007FFFC15AC000-memory.dmp

          Filesize

          496KB

        • memory/2352-103-0x00007FFFC5AF0000-0x00007FFFC5B20000-memory.dmp

          Filesize

          192KB

        • memory/2352-102-0x00007FFFC5B20000-0x00007FFFC5B38000-memory.dmp

          Filesize

          96KB

        • memory/5600-0-0x00007FFFB4833000-0x00007FFFB4835000-memory.dmp

          Filesize

          8KB

        • memory/5600-31-0x00000279DE7F0000-0x00000279DE840000-memory.dmp

          Filesize

          320KB

        • memory/5600-81-0x00007FFFB4830000-0x00007FFFB52F2000-memory.dmp

          Filesize

          10.8MB

        • memory/5600-1-0x00000279C4080000-0x00000279C40C0000-memory.dmp

          Filesize

          256KB

        • memory/5600-64-0x00000279DE940000-0x00000279DE952000-memory.dmp

          Filesize

          72KB

        • memory/5600-63-0x00000279DE910000-0x00000279DE91A000-memory.dmp

          Filesize

          40KB

        • memory/5600-2-0x00007FFFB4830000-0x00007FFFB52F2000-memory.dmp

          Filesize

          10.8MB

        • memory/5600-30-0x00000279DE840000-0x00000279DE8B6000-memory.dmp

          Filesize

          472KB

        • memory/5600-32-0x00000279DE8E0000-0x00000279DE8FE000-memory.dmp

          Filesize

          120KB