Resubmissions

02-06-2024 00:57

240602-ba8cradb7z 10

Analysis

  • max time kernel
    1200s
  • max time network
    1172s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-06-2024 00:57

General

  • Target

    loader.exe

  • Size

    365KB

  • MD5

    cbd720ad4f7be1c099ec22f56ee61dd6

  • SHA1

    9989030c7ea1756e1834c464688d418e773919fc

  • SHA256

    20be105c4a33ebf77ef4db7e8b6ebbb39b156fe1dd16473a7255903f33b76846

  • SHA512

    2ad87fdf5046be22eec58fe71326ab0bcc2a2ca019e1b5519ec1ecbdfbb83731a254c7f400ca48cacb9917da6c85d41a913aa0f8f5b21408a3f2d1e8895e9740

  • SSDEEP

    6144:UsLqdufVUNDa4loZM3fsXtioRkts/cnnK6cMlibJksyVtGXTOMdRYspb8e1m+Fii:PFUNDamoZ1tlRk83MlibJksyVtGXTOMX

Malware Config

Extracted

Family

umbral

C2

https://discordapp.com/api/webhooks/1246463015998586960/d4v_qESsKe8s7VticwxHvyytkOUO321t7x3oNxoyCNYQuwczEVfPUDFWHLnPpAM4tNJ_

Signatures

  • Detect Umbral payload 2 IoCs
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 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.

  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 6 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 4 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.

  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 6 IoCs
  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 12 IoCs
  • Suspicious use of WriteProcessMemory 43 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\loader.exe
    "C:\Users\Admin\AppData\Local\Temp\loader.exe"
    1⤵
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:5052
    • \??\c:\users\admin\appdata\local\temp\loader.exe 
      c:\users\admin\appdata\local\temp\loader.exe 
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1072
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2464
      • C:\Windows\SYSTEM32\attrib.exe
        "attrib.exe" +h +s "c:\users\admin\appdata\local\temp\loader.exe "
        3⤵
        • Views/modifies file attributes
        PID:4624
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Add-MpPreference -ExclusionPath 'c:\users\admin\appdata\local\temp\loader.exe '
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4528
      • 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⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4752
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4164
      • 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:4224
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4448
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
          PID:5112
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
            PID:1832
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
            3⤵
              PID:2884
            • C:\Windows\System32\Wbem\wmic.exe
              "wmic" path win32_VideoController get name
              3⤵
              • Detects videocard installed
              PID:2132
            • C:\Windows\SYSTEM32\cmd.exe
              "cmd.exe" /c ping localhost && del /F /A h "c:\users\admin\appdata\local\temp\loader.exe " && pause
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:1360
              • C:\Windows\system32\PING.EXE
                ping localhost
                4⤵
                • Runs ping.exe
                PID:2368
          • C:\Windows\Resources\Themes\icsys.icn.exe
            C:\Windows\Resources\Themes\icsys.icn.exe
            2⤵
            • Executes dropped EXE
            • Drops file in Windows directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:888
            • \??\c:\windows\resources\themes\explorer.exe
              c:\windows\resources\themes\explorer.exe
              3⤵
              • Modifies visiblity of hidden/system files in Explorer
              • Executes dropped EXE
              • Adds Run key to start application
              • Drops file in System32 directory
              • Drops file in Windows directory
              • Suspicious behavior: GetForegroundWindowSpam
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:2944
              • \??\c:\windows\resources\spoolsv.exe
                c:\windows\resources\spoolsv.exe SE
                4⤵
                • Executes dropped EXE
                • Drops file in Windows directory
                • Suspicious use of SetWindowsHookEx
                • Suspicious use of WriteProcessMemory
                PID:4684
                • \??\c:\windows\resources\svchost.exe
                  c:\windows\resources\svchost.exe
                  5⤵
                  • Modifies visiblity of hidden/system files in Explorer
                  • Executes dropped EXE
                  • Adds Run key to start application
                  • Drops file in System32 directory
                  • Suspicious behavior: GetForegroundWindowSpam
                  • Suspicious use of SetWindowsHookEx
                  • Suspicious use of WriteProcessMemory
                  PID:884
                  • \??\c:\windows\resources\spoolsv.exe
                    c:\windows\resources\spoolsv.exe PR
                    6⤵
                    • Executes dropped EXE
                    • Suspicious use of SetWindowsHookEx
                    PID:3452

        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

          1KB

          MD5

          b5e2fd95470c50743ba121fd6bd03a7b

          SHA1

          75545ed499d9dde51a1fc1cf535eb4f50ec79250

          SHA256

          d9c961aaf784b9ce81b0a3aac7a39bd41e9f2702d9c28deb20e786d385b88288

          SHA512

          76bdc793f8b38f603b5ad0957474660bb09e963a2496564b8ceac6591d532fc9498214b81c3908bafc13ff0b07028457c6c997998adfd2203304cb1c82899423

        • 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

          5824a6037c081fda5d46de274b6e2799

          SHA1

          526367a09300cbde430e8fb44e41cbe7a0937aac

          SHA256

          4d610d9cd32a20279c7133a726ff61820d6930e5aa18253ee1422f3a6f54953f

          SHA512

          a109b150f730cda78d5bee106bd232f9dca7500dfb7899c6919de2bd542e345ca271aa11809a24ea0a27dca158067ab3a2d5688ac0a2325185143245f1665582

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

          Filesize

          1KB

          MD5

          88be3bc8a7f90e3953298c0fdbec4d72

          SHA1

          f4969784ad421cc80ef45608727aacd0f6bf2e4b

          SHA256

          533c8470b41084e40c5660569ebbdb7496520d449629a235e8053e84025f348a

          SHA512

          4fce64e2dacddbc03314048fef1ce356ee2647c14733da121c23c65507eeb8d721d6b690ad5463319b364dc4fa95904ad6ab096907f32918e3406ef438a6ef7c

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xtnpctfo.pwh.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

          Filesize

          230KB

          MD5

          d23ca81d16873706f5e26fbac64eaee9

          SHA1

          c49585cbcc6e5286fba1c7a3fe582ea0e38ed5ee

          SHA256

          007ae5e7086ce92765cb6f3877663b04146f14deba2edb9582d90d4451b443d7

          SHA512

          4a7d4be3f7a1e27e9c925b57a5e53754f8f39ebabf479e041f620ef5271a7154fe57a407ff59f859f02f149bb60925e2f4e2c9c49f415fd42e780c7ea23922d4

        • C:\Windows\Resources\Themes\explorer.exe

          Filesize

          135KB

          MD5

          f343dae6c32a299363ca913bbf4ae43e

          SHA1

          0c63ddb2d52ec666862fe7fa467032d73f3ebb60

          SHA256

          83022bfb4e2a9e3d4bce397099f02f2f72681d779a450f1def6b501e231ef971

          SHA512

          f65547feec907d6b09590715f57507e5bc92e2d00105167d789b1225b89b5926de1947b6d7aa2c0d318bf5906137a874676497d5e39b0537d3b115ba9fb9c2f0

        • C:\Windows\Resources\Themes\icsys.icn.exe

          Filesize

          135KB

          MD5

          b6c6d532091f6de047c1a68a4b69bf10

          SHA1

          01439b14f2158014ef0255092f4c11a136483889

          SHA256

          39931e1f612c4cc3ddef588ce4a1d1c1543e85cf16959eb738ed39eb0b2b1a11

          SHA512

          b652116e7a2ebe98cb8e43d024542fdb5c8daccf85dde4c00738eedd55d7a1195155ed4b4ea26fd8e91ce1bbef54c9cd224cd4606b2028168e82c0c2de45798d

        • C:\Windows\Resources\spoolsv.exe

          Filesize

          135KB

          MD5

          5641227cd3227d165c121f78454f99db

          SHA1

          f9737a18fa9942f59702eb95471bc294d726cfba

          SHA256

          056db92d8d494627436d0811b5f6a7c5a930dfebaca2987209b708586923e5f5

          SHA512

          1ab45cb978c7fe818fdb351401910c473c621adfa769d9aab402895c73fcfd70685e513ecdaf0f249b9d3037ca0840c9d9126c44fca5250404d972ec6ce948ec

        • \??\c:\windows\resources\svchost.exe

          Filesize

          135KB

          MD5

          9d0d40870e6fad42237ff687f7f5502b

          SHA1

          dae9e8d6a60953fb0d9ab45916bea202cc737f9c

          SHA256

          c28acc692eb75315e86c4dc2b1a4f5622de7191e6dd9370e7127183c638d350a

          SHA512

          07e248c5055d2382c5e963683d2d102fce86caec72f3f807640b26f6ebda081628e091c1109c2c4d503133b1fd0b126fe4ea4b96cc3284a2941a0fd8c3e751fa

        • memory/884-136-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/888-78-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/888-117-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/1072-11-0x00007FF8E95B0000-0x00007FF8EA071000-memory.dmp

          Filesize

          10.8MB

        • memory/1072-82-0x000001A4D41C0000-0x000001A4D41D2000-memory.dmp

          Filesize

          72KB

        • memory/1072-81-0x000001A4D4190000-0x000001A4D419A000-memory.dmp

          Filesize

          40KB

        • memory/1072-38-0x000001A4D41E0000-0x000001A4D4256000-memory.dmp

          Filesize

          472KB

        • memory/1072-9-0x00007FF8E95B3000-0x00007FF8E95B5000-memory.dmp

          Filesize

          8KB

        • memory/1072-40-0x000001A4D4160000-0x000001A4D417E000-memory.dmp

          Filesize

          120KB

        • memory/1072-39-0x000001A4D4260000-0x000001A4D42B0000-memory.dmp

          Filesize

          320KB

        • memory/1072-10-0x000001A4B9A90000-0x000001A4B9AD0000-memory.dmp

          Filesize

          256KB

        • memory/1072-134-0x00007FF8E95B0000-0x00007FF8EA071000-memory.dmp

          Filesize

          10.8MB

        • memory/2944-135-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/3452-115-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/4528-13-0x00000121CDEB0000-0x00000121CDED2000-memory.dmp

          Filesize

          136KB

        • memory/4684-116-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/5052-0-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/5052-118-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB