Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-07-2024 09:30

General

  • Target

    Umbral.exe

  • Size

    229KB

  • MD5

    e91e7d0ed8c652cc6d31b843ce779610

  • SHA1

    30100ace6bde410478ab46fd06ffb28759fbbd78

  • SHA256

    de9370ce0b17b04fa1deb6403251580f6cf32035659da7ed57756c08c690d666

  • SHA512

    9ccda4488fc512344ce51b6173da48902058df858ff82edbe906ef7c116800074823fc179f69ad687d4196d21bf4683ca5dc4a142f69a127714ae3dc37aa1130

  • SSDEEP

    6144:lloZM9rIkd8g+EtXHkv/iD4UZ7coOJBi0HaIJtMByb8e1mF56Yi:noZOL+EP8UZ7coOJBi0HaIJtMgs50

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

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

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • 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 2 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.

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

    Adversaries may check for Internet connectivity on compromised systems.

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Modifies registry class 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of WriteProcessMemory 24 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⤵
    • Drops file in Drivers directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:644
    • C:\Windows\SYSTEM32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
      2⤵
      • Views/modifies file attributes
      PID:2012
    • 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 use of AdjustPrivilegeToken
      PID:1812
    • 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 use of AdjustPrivilegeToken
      PID:2828
    • 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 use of AdjustPrivilegeToken
      PID:1856
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:468
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1308
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2472
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
        PID:4928
      • 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
        PID:3108
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic" path win32_VideoController get name
        2⤵
        • Detects videocard installed
        PID:812
      • C:\Windows\SYSTEM32\cmd.exe
        "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Umbral.exe" && pause
        2⤵
        • System Network Configuration Discovery: Internet Connection Discovery
        • Suspicious use of WriteProcessMemory
        PID:4548
        • C:\Windows\system32\PING.EXE
          ping localhost
          3⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Runs ping.exe
          PID:2344
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Checks SCSI registry key(s)
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:3536
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:1856

      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

        d28a889fd956d5cb3accfbaf1143eb6f

        SHA1

        157ba54b365341f8ff06707d996b3635da8446f7

        SHA256

        21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

        SHA512

        0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

        Filesize

        948B

        MD5

        0e046a2ca47c01116ab2c42b4553232c

        SHA1

        750650547f305d5cd7f832341f6a17618aa98800

        SHA256

        d063753bbc9924e4bf9306167893909c3898072109e13b479ccdac493a8f3a2d

        SHA512

        dc1c95dbb27fb1fcc577a841abad5a2ca16445b1c51640853f497df8fca260ae5d5fee2d402b18c61a263a6af5a5b71661fb880234bd8de3e6636887f03ae0df

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

        Filesize

        1KB

        MD5

        45fb9d7dd2918093a914fef36f5eeb21

        SHA1

        62ada2131906247f7c8c0862f4fcd9750d1334de

        SHA256

        aea229b88071a17a2ac0ea96bdc4e6a632ddb9e5dabf09541117390f1c191869

        SHA512

        2dca3ed9b281b5e97b86d1a7e939986910723a147afe3906b7ca1a224b83a22a378fc10742db96947e7e797ad7244d78985e938ad5eba711989943ba913bd2de

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

        Filesize

        1KB

        MD5

        cb5c30d213a938d76ea627a4d05a0111

        SHA1

        9618958b449d646cb833edefb01dd372f8f0f4b0

        SHA256

        387991a291e69339f9a6099b4e9c55e55e5c6409e2c8ec50aa7ddbe3025a39dc

        SHA512

        54ff985ae7f14cc1a3c02d502be4c57ffbc231394e6358c37a0b00513d660ac52198bd946b1972491df54870e8414f905f7d398f0787ee1fe6652e194c801f07

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_d1v23dj4.sdx.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/644-47-0x000001B66D0F0000-0x000001B66D10E000-memory.dmp

        Filesize

        120KB

      • memory/644-16-0x00007FFF03BF3000-0x00007FFF03BF5000-memory.dmp

        Filesize

        8KB

      • memory/644-104-0x00007FFF03BF0000-0x00007FFF046B1000-memory.dmp

        Filesize

        10.8MB

      • memory/644-103-0x000001B66D280000-0x000001B66D429000-memory.dmp

        Filesize

        1.7MB

      • memory/644-99-0x000001B66D280000-0x000001B66D429000-memory.dmp

        Filesize

        1.7MB

      • memory/644-1-0x000001B6528E0000-0x000001B652920000-memory.dmp

        Filesize

        256KB

      • memory/644-84-0x000001B66CEC0000-0x000001B66CED2000-memory.dmp

        Filesize

        72KB

      • memory/644-46-0x000001B66D080000-0x000001B66D0D0000-memory.dmp

        Filesize

        320KB

      • memory/644-17-0x00007FFF03BF0000-0x00007FFF046B1000-memory.dmp

        Filesize

        10.8MB

      • memory/644-83-0x000001B66CE90000-0x000001B66CE9A000-memory.dmp

        Filesize

        40KB

      • memory/644-45-0x000001B66D000000-0x000001B66D076000-memory.dmp

        Filesize

        472KB

      • memory/644-2-0x00007FFF03BF0000-0x00007FFF046B1000-memory.dmp

        Filesize

        10.8MB

      • memory/644-0-0x00007FFF03BF3000-0x00007FFF03BF5000-memory.dmp

        Filesize

        8KB

      • memory/1812-28-0x00000260A02E0000-0x00000260A0302000-memory.dmp

        Filesize

        136KB

      • memory/3536-4-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-5-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-3-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-14-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-15-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-9-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-10-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-11-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-12-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB

      • memory/3536-13-0x000001E9FBFA0000-0x000001E9FBFA1000-memory.dmp

        Filesize

        4KB