Analysis

  • max time kernel
    61s
  • max time network
    64s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-05-2024 09:08

General

  • Target

    clean.exe

  • Size

    229KB

  • MD5

    afc4798057dd3b9a73225e98546c6e72

  • SHA1

    af1a74d8c7be3f1f95fd9e7d6ebfad0fdd105645

  • SHA256

    ec4b26011b3dbc1ee514189ca764e73ce7c2acc7a7f6e9cfa8190c8151484ab7

  • SHA512

    577469a498352b6557941cd9db8ef13711758870b6fa385ae9b9eaec3ad0b786ec6c50a4413d786a75c1af1e5bf3b2673bc8aacb71d539a70ae116ea4bc27ef8

  • SSDEEP

    6144:lloZM9rIkd8g+EtXHkv/iD4lSHJxfEY3umfh8Iti+b8e1m+di:noZmL+EP8lSHJxfEY3umfh8ItZF0

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

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

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

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

  • 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.

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

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 30 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 44 IoCs
  • Suspicious use of SendNotifyMessage 44 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\clean.exe
    "C:\Users\Admin\AppData\Local\Temp\clean.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3552
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:5104
    • C:\Windows\SYSTEM32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\clean.exe"
      2⤵
      • Views/modifies file attributes
      PID:836
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\clean.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2532
    • 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⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4204
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2124
    • 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:4792
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1404
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:4172
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:344
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
          2⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:4328
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:780
        • C:\Windows\SYSTEM32\cmd.exe
          "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\clean.exe" && pause
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3532
          • C:\Windows\system32\PING.EXE
            ping localhost
            3⤵
            • Runs ping.exe
            PID:2236
      • C:\Windows\system32\taskmgr.exe
        "C:\Windows\system32\taskmgr.exe" /4
        1⤵
        • Checks SCSI registry key(s)
        • Checks processor information in registry
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:3316

      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

        c65738617888921a153bd9b1ef516ee7

        SHA1

        5245e71ea3c181d76320c857b639272ac9e079b1

        SHA256

        4640ba4001fd16a593315299cbdd4988dc2c7075820687f1018aac40aca95c26

        SHA512

        2e2a0ebd93f9d8dd07a7599054bce232683e9add9a35e77b584618040bcfd84a42545352519ec4736cc379002210b6f3ed2d905591c6925c0981b0392b495bfa

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

        Filesize

        1KB

        MD5

        548dd08570d121a65e82abb7171cae1c

        SHA1

        1a1b5084b3a78f3acd0d811cc79dbcac121217ab

        SHA256

        cdf17b8532ebcebac3cfe23954a30aa32edd268d040da79c82687e4ccb044adc

        SHA512

        37b98b09178b51eec9599af90d027d2f1028202efc1633047e16e41f1a95610984af5620baac07db085ccfcb96942aafffad17aa1f44f63233e83869dc9f697b

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

        Filesize

        1KB

        MD5

        45ad40f012b09e141955482368549640

        SHA1

        3f9cd15875c1e397c3b2b5592805577ae88a96cb

        SHA256

        ea3b59172f1a33677f9cb3843fb4d6093b806d3a7cf2f3c6d4692f5421f656ce

        SHA512

        3de08f8affca1c1450088f560776cf3d65146cadac43c06eb922c7b3cea436e519966cf38458303ffeb1a58c53f8952cffda6c34216fda7594e014b516e83b33

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cuw15pgb.bef.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/2532-11-0x00000226B6E80000-0x00000226B6EA2000-memory.dmp

        Filesize

        136KB

      • memory/2532-3-0x00007FF91F0A0000-0x00007FF91FB61000-memory.dmp

        Filesize

        10.8MB

      • memory/2532-18-0x00007FF91F0A0000-0x00007FF91FB61000-memory.dmp

        Filesize

        10.8MB

      • memory/2532-5-0x00007FF91F0A0000-0x00007FF91FB61000-memory.dmp

        Filesize

        10.8MB

      • memory/2532-4-0x00007FF91F0A0000-0x00007FF91FB61000-memory.dmp

        Filesize

        10.8MB

      • memory/3316-99-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-98-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-92-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-97-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-100-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-101-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-102-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-96-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-91-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3316-90-0x0000019BC46D0000-0x0000019BC46D1000-memory.dmp

        Filesize

        4KB

      • memory/3552-33-0x00000110A0410000-0x00000110A0460000-memory.dmp

        Filesize

        320KB

      • memory/3552-89-0x00007FF91F0A0000-0x00007FF91FB61000-memory.dmp

        Filesize

        10.8MB

      • memory/3552-0-0x00007FF91F0A3000-0x00007FF91F0A5000-memory.dmp

        Filesize

        8KB

      • memory/3552-71-0x00000110A0460000-0x00000110A0472000-memory.dmp

        Filesize

        72KB

      • memory/3552-70-0x00000110A0350000-0x00000110A035A000-memory.dmp

        Filesize

        40KB

      • memory/3552-2-0x00007FF91F0A0000-0x00007FF91FB61000-memory.dmp

        Filesize

        10.8MB

      • memory/3552-34-0x00000110A0320000-0x00000110A033E000-memory.dmp

        Filesize

        120KB

      • memory/3552-1-0x0000011085C60000-0x0000011085CA0000-memory.dmp

        Filesize

        256KB

      • memory/3552-32-0x00000110A0390000-0x00000110A0406000-memory.dmp

        Filesize

        472KB