Resubmissions

12/01/2023, 20:01

230112-yrh6hsae5210

07/01/2023, 04:41

230107-fa3jqagb8t10

07/01/2023, 04:21

230107-eynj2acf8710

Analysis

  • max time kernel
    59s
  • max time network
    63s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/01/2023, 04:41

General

  • Target
    0a0a64f3c4fa7d960be983aa0a7d0ce8.exe
  • Size 3.8MB
  • Sample230107-fa3jqagb8t
  • SHA256 6d95012691b58c36574d4b1061b07e0a8340909664908e991fad91028777fdd1
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat 25 IoCs

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

  • Modifies WinLogon for persistence 2 TTPs 8 IoCs
  • Process spawned unexpected child process 24 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Adds Run key to start application 2 TTPs 16 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in Program Files directory 25 IoCs
  • Drops file in Windows directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 24 IoCs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 51 IoCs
  • Suspicious use of AdjustPrivilegeToken 14 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • System policy modification 1 TTPs 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe
    "C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • UAC bypass
    • Checks computer location settings
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2700
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\0a0a64f3c4fa7d960be983aa0a7d0ce8.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3476
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\All Users\Adobe\Setup\Registry.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2960
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Recovery\WindowsRE\SIHClient.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4588
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Windows Portable Devices\SIHClient.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1196
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files\VideoLAN\VLC\locale\cgg\LC_MESSAGES\csrss.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1652
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\SystemApps\Microsoft.MicrosoftEdgeDevToolsClient_8wekyb3d8bbwe\spoolsv.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2208
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Internet Explorer\SIGNUP\OfficeClickToRun.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4276
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Windows Media Player\dwm.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:5096
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\winlogon.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2588
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\XJgX3joyyg.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2196
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:4916
        • C:\Program Files (x86)\Windows Media Player\dwm.exe
          "C:\Program Files (x86)\Windows Media Player\dwm.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks computer location settings
          • Checks whether UAC is enabled
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • System policy modification
          PID:1768
          • C:\Windows\System32\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\18b95992-22dc-41dd-8aaf-812ca227ed56.vbs"
            4⤵
              PID:1300
            • C:\Windows\System32\WScript.exe
              "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\67fe6794-ea3f-4bf5-9c76-d2589a8d02d7.vbs"
              4⤵
                PID:2700
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 6 /tr "'C:\Users\All Users\Adobe\Setup\Registry.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1688
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Users\All Users\Adobe\Setup\Registry.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:816
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Adobe\Setup\Registry.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4968
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SIHClientS" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\SIHClient.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2112
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SIHClient" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SIHClient.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4924
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SIHClientS" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\SIHClient.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:364
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Program Files\VideoLAN\VLC\locale\cgg\LC_MESSAGES\csrss.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3028
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\VLC\locale\cgg\LC_MESSAGES\csrss.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3268
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Program Files\VideoLAN\VLC\locale\cgg\LC_MESSAGES\csrss.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2980
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SIHClientS" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Portable Devices\SIHClient.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2340
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SIHClient" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\SIHClient.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1380
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SIHClientS" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Portable Devices\SIHClient.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1356
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\winlogon.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1308
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\winlogon.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2628
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\winlogon.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3032
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Media Player\dwm.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1312
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Media Player\dwm.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4916
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows Media Player\dwm.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4904
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\OfficeClickToRun.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2640
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\OfficeClickToRun.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3512
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Internet Explorer\SIGNUP\OfficeClickToRun.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1304
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 8 /tr "'C:\Windows\SystemApps\Microsoft.MicrosoftEdgeDevToolsClient_8wekyb3d8bbwe\spoolsv.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4788
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.MicrosoftEdgeDevToolsClient_8wekyb3d8bbwe\spoolsv.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2536
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 8 /tr "'C:\Windows\SystemApps\Microsoft.MicrosoftEdgeDevToolsClient_8wekyb3d8bbwe\spoolsv.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:32
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1556

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              dwm.exe

              • Path C:\Program Files (x86)\Windows Media Player\dwm.exe
              • Size 3.8MB
              • SHA256 31506cfef39e936206adaf2b95c8cbead6863c344d818bd458697b26bc59cc31
              • MD5 SHA1 SHA512 SSDEEP

              dwm.exe

              • Path C:\Program Files (x86)\Windows Media Player\dwm.exe
              • Size 3.8MB
              • SHA256 31506cfef39e936206adaf2b95c8cbead6863c344d818bd458697b26bc59cc31
              • MD5 SHA1 SHA512 SSDEEP

              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 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 986366767de5873f1b170a63f2a33ce05132d1afd90c8f5017afbca8ef1beb05
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 a31805264b8b13ce4145f272cb2830728c186c46e314b48514d636866217add5
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 a31805264b8b13ce4145f272cb2830728c186c46e314b48514d636866217add5
              • MD5 SHA1 SHA512

              18b95992-22dc-41dd-8aaf-812ca227ed56.vbs

              • Path C:\Users\Admin\AppData\Local\Temp\18b95992-22dc-41dd-8aaf-812ca227ed56.vbs
              • Size 727B
              • SHA256 d16c80cd8389a723a278f8219ab9ea3c328e7dab5ee4f93955e3e2ba825adf0a
              • MD5 SHA1 SHA512

              67fe6794-ea3f-4bf5-9c76-d2589a8d02d7.vbs

              • Path C:\Users\Admin\AppData\Local\Temp\67fe6794-ea3f-4bf5-9c76-d2589a8d02d7.vbs
              • Size 503B
              • SHA256 f0c9e34ec34c3eb6b792247173063cae0fc9dfc0c90664ddfff66167d3822ae6
              • MD5 SHA1 SHA512

              XJgX3joyyg.bat

              • Path C:\Users\Admin\AppData\Local\Temp\XJgX3joyyg.bat
              • Size 216B
              • SHA256 9aa1c13e9ea87e9139010d647ff1adce4dca690088640c6695fe387e9bc64549
              • MD5 SHA1 SHA512

              memory/1196-152-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/1196-166-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/1652-169-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/1652-150-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/1768-181-0x00007FF99EAE0000-0x00007FF99F5A1000-memory.dmp

              memory/1768-187-0x000000001E490000-0x000000001E652000-memory.dmp

              memory/1768-186-0x00007FF99EAE0000-0x00007FF99F5A1000-memory.dmp

              memory/1768-180-0x0000000000950000-0x0000000000D1A000-memory.dmp

              memory/2208-157-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2208-170-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2588-172-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2588-153-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2700-133-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2700-147-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2700-132-0x0000000000180000-0x000000000054A000-memory.dmp

              memory/2700-135-0x000000001C880000-0x000000001CDA8000-memory.dmp

              memory/2700-134-0x0000000002750000-0x00000000027A0000-memory.dmp

              memory/2960-168-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/2960-149-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/3476-145-0x000001A136720000-0x000001A136742000-memory.dmp

              memory/3476-148-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/3476-159-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/4276-155-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/4276-171-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/4588-151-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/4588-174-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/5096-156-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp

              memory/5096-176-0x00007FF99EA80000-0x00007FF99F541000-memory.dmp