Analysis

  • max time kernel
    150s
  • max time network
    132s
  • 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 01:23

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 3 IoCs
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 3 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 9 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 6 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 3 IoCs
  • Drops file in Windows directory 5 IoCs
  • 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 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 56 IoCs
  • Suspicious use of SendNotifyMessage 56 IoCs
  • Suspicious use of SetWindowsHookEx 18 IoCs
  • Suspicious use of WriteProcessMemory 52 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:1312
    • \??\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:1612
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3932
      • C:\Windows\SYSTEM32\attrib.exe
        "attrib.exe" +h +s "c:\users\admin\appdata\local\temp\loader.exe "
        3⤵
        • Views/modifies file attributes
        PID:2552
      • 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:1424
      • 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:2868
      • 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:4848
      • 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:2440
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3152
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
          PID:4352
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
            PID:2784
          • 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:4516
            • C:\Windows\System32\Wbem\wmic.exe
              "wmic" path win32_VideoController get name
              3⤵
              • Detects videocard installed
              PID:2780
            • 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:3180
              • C:\Windows\system32\PING.EXE
                ping localhost
                4⤵
                • Runs ping.exe
                PID:4004
          • 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:4276
            • \??\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:3228
              • \??\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:5088
                • \??\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:4484
                  • \??\c:\windows\resources\spoolsv.exe
                    c:\windows\resources\spoolsv.exe PR
                    6⤵
                    • Executes dropped EXE
                    • Suspicious use of SetWindowsHookEx
                    PID:1580
                  • \??\c:\windows\resources\spoolsv.exe
                    c:\windows\resources\spoolsv.exe PR
                    6⤵
                    • Executes dropped EXE
                    • Suspicious use of SetWindowsHookEx
                    • Suspicious use of WriteProcessMemory
                    PID:3352
                    • \??\c:\windows\resources\themes\explorer.exe
                      c:\windows\resources\themes\explorer.exe
                      7⤵
                      • 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:5008
                      • \??\c:\windows\resources\spoolsv.exe
                        c:\windows\resources\spoolsv.exe SE
                        8⤵
                        • Executes dropped EXE
                        • Suspicious use of SetWindowsHookEx
                        PID:3564
        • C:\Windows\system32\taskmgr.exe
          "C:\Windows\system32\taskmgr.exe" /4
          1⤵
          • Checks SCSI registry key(s)
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          PID:2800

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\kyaY3.scr

          Filesize

          365KB

          MD5

          cbd720ad4f7be1c099ec22f56ee61dd6

          SHA1

          9989030c7ea1756e1834c464688d418e773919fc

          SHA256

          20be105c4a33ebf77ef4db7e8b6ebbb39b156fe1dd16473a7255903f33b76846

          SHA512

          2ad87fdf5046be22eec58fe71326ab0bcc2a2ca019e1b5519ec1ecbdfbb83731a254c7f400ca48cacb9917da6c85d41a913aa0f8f5b21408a3f2d1e8895e9740

        • 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

          e4d5f16dff1c6c4bd78c48253f411da2

          SHA1

          0fb7366585572b2cf4144d169302ba21d8e71ac3

          SHA256

          360fe2bf9d46f0e6bb35c1b41ba0d70c5f10a1a9b42e29d9cafea37de5964133

          SHA512

          27cb84814bf84d0db623e68c06b6391e63d985d5fe77a9d6ca9093329fbe73da490bb9bef67fea667d2d03b1d42ed5b4591f9e72c281c15965d0765c019d4b69

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

          Filesize

          944B

          MD5

          6d42b6da621e8df5674e26b799c8e2aa

          SHA1

          ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

          SHA256

          5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

          SHA512

          53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

          Filesize

          948B

          MD5

          c65738617888921a153bd9b1ef516ee7

          SHA1

          5245e71ea3c181d76320c857b639272ac9e079b1

          SHA256

          4640ba4001fd16a593315299cbdd4988dc2c7075820687f1018aac40aca95c26

          SHA512

          2e2a0ebd93f9d8dd07a7599054bce232683e9add9a35e77b584618040bcfd84a42545352519ec4736cc379002210b6f3ed2d905591c6925c0981b0392b495bfa

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

          Filesize

          1KB

          MD5

          e0ec6bf376a6b15852bce768196c5ed0

          SHA1

          05fe4e592ebbb7e29f36b8d30a6a90ba29bd4f81

          SHA256

          2d4a39cbbd597a7cfff477817c3c7c541c14974c8d234b4c0de6d229e3a3ce97

          SHA512

          dc0c7d3d127c88affea9ae402d7358c079cfa7fc3ecb417085e31dc749da1406e72563bfbe42167fdad57e10aa0c6cca7a8ba06921b3a1212ad7ccee1a0f859b

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qbonqqg5.1qe.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

          0178090a379220034a48a292807107ff

          SHA1

          0ce5263514a25a8b8c30f8b1e3de33f7e0248bb5

          SHA256

          270e07515a881b2008e147331b94c1cf9efdc40916525cc30f33f7d0c5785fdd

          SHA512

          4f2d3a36f7d540dd9ddc9dd53bf791dab6da1e2f490abd9eba1952b9855b1759c20aa8e9fbb3ba3066afee5f895285e006b7e113c05911509008a432ee7f217b

        • 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

          be65e330ef38291581f724df503b248c

          SHA1

          13b93c90f21d79f48dc4c724d4bc7fcbb6038076

          SHA256

          9cb11f6d41aaa792a56a07d2539bc256e67da07ccf3a5aa8ec74c1d050327a16

          SHA512

          ef6049e746998da41d48d0565337573c414727e03aafb4c47fddd262886674d31c1e00d62fdf18c2187a888bd388d20b2078c7c8505d417e0830c87cea37b15f

        • C:\Windows\Resources\svchost.exe

          Filesize

          135KB

          MD5

          a4f5b01eae87239da790490a1acc8a64

          SHA1

          cb5158bf6284acb171d42b1a70baf25edf0af5be

          SHA256

          146dd51a88bffc71627c9308e47b50565b98635aad91bf12e52b3a2fc3a78ef9

          SHA512

          0755e9ccf376be413342bfbeebce4098deff839e283a4a46f623357a0e24b1650516504abef5d47adcb369c565d523eb890c83ce834609f189da016b500bb655

        • memory/1312-118-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/1312-0-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/1424-17-0x0000023CEE0F0000-0x0000023CEE112000-memory.dmp

          Filesize

          136KB

        • memory/1580-115-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/1612-39-0x00000127E82A0000-0x00000127E82F0000-memory.dmp

          Filesize

          320KB

        • memory/1612-9-0x00007FF8F5A83000-0x00007FF8F5A85000-memory.dmp

          Filesize

          8KB

        • memory/1612-84-0x00000127E81D0000-0x00000127E81E2000-memory.dmp

          Filesize

          72KB

        • memory/1612-10-0x00000127CDAA0000-0x00000127CDAE0000-memory.dmp

          Filesize

          256KB

        • memory/1612-40-0x00000127CF740000-0x00000127CF75E000-memory.dmp

          Filesize

          120KB

        • memory/1612-38-0x00000127E8220000-0x00000127E8296000-memory.dmp

          Filesize

          472KB

        • memory/1612-83-0x00000127CF770000-0x00000127CF77A000-memory.dmp

          Filesize

          40KB

        • memory/1612-134-0x00007FF8F5A80000-0x00007FF8F6541000-memory.dmp

          Filesize

          10.8MB

        • memory/1612-11-0x00007FF8F5A80000-0x00007FF8F6541000-memory.dmp

          Filesize

          10.8MB

        • memory/2800-144-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-146-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-137-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-136-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-135-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-141-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-147-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-142-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-143-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/2800-145-0x000002B77CC10000-0x000002B77CC11000-memory.dmp

          Filesize

          4KB

        • memory/3228-149-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/3352-163-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/3564-162-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/4276-117-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/4276-78-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB

        • memory/5088-116-0x0000000000400000-0x000000000041F000-memory.dmp

          Filesize

          124KB