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Analysis

  • max time kernel
    9s
  • max time network
    7s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    02/02/2025, 20:45

General

  • Target

    CrypticBootstrapper.exe

  • Size

    229KB

  • MD5

    756d710e520f1d3ec62b72cf4174718e

  • SHA1

    956450b12e01a5edbecb995d2d284fc3f22f933d

  • SHA256

    c2ca7672dcc37f2d7d1d0a9ebbdd714b54558b3159033a60314599060b69b23e

  • SHA512

    2572e520eac2e4aca7898d944be108f6b6f3b0eb0ccdc895fa6d4071122832d1c5f72c63ee7c9f9b44e89d8b456af17ef4c5042e4f45ac91bd428ba24f781187

  • SSDEEP

    6144:FloZM+rIkd8g+EtXHkv/iD4oJCllTwk7viTlwsJeImlC8e1mUGDi:HoZtL+EP8aCllTwk7viTlwsJ0C0O

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.

  • 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.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe
    "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
    1⤵
    • Drops file in Drivers directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2248
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3636
    • C:\Windows\SYSTEM32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
      2⤵
      • Views/modifies file attributes
      PID:2848
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3856
    • 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:2464
    • 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:3516
    • 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:2160
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4668
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:720
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:3828
        • 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:3616
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:2136
        • C:\Windows\SYSTEM32\cmd.exe
          "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe" && pause
          2⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Suspicious use of WriteProcessMemory
          PID:3436
          • C:\Windows\system32\PING.EXE
            ping localhost
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:792

      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

        627073ee3ca9676911bee35548eff2b8

        SHA1

        4c4b68c65e2cab9864b51167d710aa29ebdcff2e

        SHA256

        85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

        SHA512

        3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

        Filesize

        944B

        MD5

        7d760ca2472bcb9fe9310090d91318ce

        SHA1

        cb316b8560b38ea16a17626e685d5a501cd31c4a

        SHA256

        5c362b53c4a4578d8b57c51e1eac15f7f3b2447e43e0dad5102ecd003d5b41d4

        SHA512

        141e8661d7348ebbc1f74f828df956a0c6e4cdb70f3b9d52623c9a30993bfd91da9ed7d8d284b84f173d3e6f47c876fb4a8295110895f44d97fd6cc4c5659c35

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

        Filesize

        948B

        MD5

        fa21dd50b4e64421076f843031c8ccf7

        SHA1

        2c56e94f130c0d8d77116e939ffee4e37cf982bd

        SHA256

        e4f21aca1e12aafa8de7af24b79a75526e902c7d4b3fea5bdb6e723976997be3

        SHA512

        b8de2bfeb7af06c587dd1f424d410cf83471f31a55a3ea4c4481ce07ffd9bf66ddc1f7775ecd6ac65ac33baaec90ba5a208a9aefc84f31125a50dfb919982687

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

        Filesize

        1KB

        MD5

        7332074ae2b01262736b6fbd9e100dac

        SHA1

        22f992165065107cc9417fa4117240d84414a13c

        SHA256

        baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

        SHA512

        4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

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

        Filesize

        1KB

        MD5

        b95bea0e645f6de57d24b86919c5043d

        SHA1

        a618ae57d56da493177bfd7510e1507dce6382a7

        SHA256

        4d63dbe6465121136a77767bde1ddf6eeff1ce7c792272b9e6dd1732e6a49b1e

        SHA512

        73b28e62b6ff9eb38f495b3bb1a64812d0800a949b88b32516e3386e70a8ad4127245aa0bf07345950b3b357fc7e54a563ab5f9543e49245b0ec81656f60f0fc

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mx11ikq0.sko.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/2248-68-0x000001E8DF630000-0x000001E8DF63A000-memory.dmp

        Filesize

        40KB

      • memory/2248-33-0x000001E8DF640000-0x000001E8DF65E000-memory.dmp

        Filesize

        120KB

      • memory/2248-88-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/2248-69-0x000001E8DF680000-0x000001E8DF692000-memory.dmp

        Filesize

        72KB

      • memory/2248-2-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/2248-31-0x000001E8DF6A0000-0x000001E8DF716000-memory.dmp

        Filesize

        472KB

      • memory/2248-32-0x000001E8DF720000-0x000001E8DF770000-memory.dmp

        Filesize

        320KB

      • memory/2248-0-0x00007FFC2A033000-0x00007FFC2A035000-memory.dmp

        Filesize

        8KB

      • memory/2248-1-0x000001E8C4ED0000-0x000001E8C4F10000-memory.dmp

        Filesize

        256KB

      • memory/3856-14-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/3856-5-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/3856-3-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/3856-4-0x000001FFD8C50000-0x000001FFD8C72000-memory.dmp

        Filesize

        136KB

      • memory/3856-17-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB