Analysis

  • max time kernel
    1359s
  • max time network
    1149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-uk
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-uklocale:uk-uaos:windows10-2004-x64systemwindows
  • submitted
    21-08-2024 07:39

General

  • Target

    Umbral.exe

  • Size

    231KB

  • MD5

    dae35caa4639b153b0531ec0ed895a79

  • SHA1

    03326ba6ddbc338f6165697e86a1439826c7af2b

  • SHA256

    23f54c809daf84b074a3286df27497739b43f5f98a521e29050a5083f2d405e7

  • SHA512

    a270a4212187e2292f1b9884c916232fbabfdc45356a32896150c7b7d93a3d9abe173281bff90f7ab35654abce82cba9c55ebeb98de8c612241277ea48bc5d12

  • SSDEEP

    6144:xloZM+rIkd8g+EtXHkv/iD4bhIqlZ8e1mKgi:DoZtL+EP8v7/

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.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 29 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\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:2972
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:936
    • C:\Windows\SYSTEM32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
      2⤵
      • Views/modifies file attributes
      PID:2728
    • 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:3788
    • 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:2732
    • 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:4824
    • 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:3128
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2740
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:4216
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:4320
        • 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:2688
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:3060
        • 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:5084
          • C:\Windows\system32\PING.EXE
            ping localhost
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:1660
      • C:\Windows\system32\taskmgr.exe
        "C:\Windows\system32\taskmgr.exe" /4
        1⤵
        • Checks SCSI registry key(s)
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:4564

      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

        084f18b6ff291729e6f5cf628977198e

        SHA1

        c82d27261030eef59ad2258d4eeb9119116a67a1

        SHA256

        a7570027dec18cac2a8bdefe9c49621040d12f4f07d935202a66691a119a9ee1

        SHA512

        8835aaec15895d90c724b0a7671f7b68dae23389124949336d2fa7d8fffe980421b625d8d8a0a73f9a6e9affc23c0ccdcc5998820adcf5829df7bd1fa7e6c73a

      • 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_3kqnxjzt.hm4.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/2972-87-0x00007FFB39CF0000-0x00007FFB3A7B1000-memory.dmp

        Filesize

        10.8MB

      • memory/2972-0-0x00007FFB39CF3000-0x00007FFB39CF5000-memory.dmp

        Filesize

        8KB

      • memory/2972-86-0x00007FFB39CF3000-0x00007FFB39CF5000-memory.dmp

        Filesize

        8KB

      • memory/2972-91-0x00007FFB39CF0000-0x00007FFB3A7B1000-memory.dmp

        Filesize

        10.8MB

      • memory/2972-32-0x0000022024990000-0x0000022024A06000-memory.dmp

        Filesize

        472KB

      • memory/2972-33-0x0000022024800000-0x0000022024850000-memory.dmp

        Filesize

        320KB

      • memory/2972-34-0x000002200A6C0000-0x000002200A6DE000-memory.dmp

        Filesize

        120KB

      • memory/2972-2-0x00007FFB39CF0000-0x00007FFB3A7B1000-memory.dmp

        Filesize

        10.8MB

      • memory/2972-1-0x000002200A1C0000-0x000002200A200000-memory.dmp

        Filesize

        256KB

      • memory/2972-70-0x000002200BFC0000-0x000002200BFCA000-memory.dmp

        Filesize

        40KB

      • memory/2972-71-0x0000022024850000-0x0000022024862000-memory.dmp

        Filesize

        72KB

      • memory/3788-17-0x00007FFB39CF0000-0x00007FFB3A7B1000-memory.dmp

        Filesize

        10.8MB

      • memory/3788-14-0x000001A1707B0000-0x000001A1707D2000-memory.dmp

        Filesize

        136KB

      • memory/3788-4-0x00007FFB39CF0000-0x00007FFB3A7B1000-memory.dmp

        Filesize

        10.8MB

      • memory/3788-3-0x00007FFB39CF0000-0x00007FFB3A7B1000-memory.dmp

        Filesize

        10.8MB

      • memory/4564-92-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-93-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-94-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-100-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-99-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-104-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-103-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-102-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-101-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB

      • memory/4564-98-0x000002169B5A0000-0x000002169B5A1000-memory.dmp

        Filesize

        4KB