Analysis

  • max time kernel
    123s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/09/2022, 15:01

General

  • Target
    54b3ae8eec0c73f0ac6993f761a8b099.exe
  • Size 4.0MB
  • Sample220924-sdwa2abeb5
  • SHA256 22a2d7af185892d400b7b98c62dedaf8ff9bfdf65fcc7c6c20d4ca102452db6d
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10

Malware Config

Signatures

  • DcRat

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

  • Process spawned unexpected child process 27 IoCs

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

  • DCRat payload 5 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

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

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

  • Drops file in Program Files directory 7 IoCs
  • Drops file in Windows directory 4 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 27 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\54b3ae8eec0c73f0ac6993f761a8b099.exe
    "C:\Users\Admin\AppData\Local\Temp\54b3ae8eec0c73f0ac6993f761a8b099.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1800
    • C:\Users\Admin\AppData\Local\Temp\go-memexec-3878489337.exe
      C:\Users\Admin\AppData\Local\Temp\go-memexec-3878489337.exe
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • 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
      PID:1448
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\iZC2HVp7ET.bat"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3984
        • C:\Windows\system32\w32tm.exe
          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
          4⤵
            PID:2388
          • C:\Users\Default User\Registry.exe
            "C:\Users\Default User\Registry.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of AdjustPrivilegeToken
            PID:1912
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\odt\smss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2824
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\odt\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3796
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\odt\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3352
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1672
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3888
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:320
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Windows\IdentityCRL\INT\lsass.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2008
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\IdentityCRL\INT\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2324
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Windows\IdentityCRL\INT\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4940
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Users\Default User\Registry.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4800
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Users\Default User\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3960
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\Registry.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4024
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 11 /tr "'C:\Windows\Registration\lsass.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2636
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\Registration\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4236
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 14 /tr "'C:\Windows\Registration\lsass.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2296
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "54b3ae8eec0c73f0ac6993f761a8b0995" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\WindowsPowerShell\54b3ae8eec0c73f0ac6993f761a8b099.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4316
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "54b3ae8eec0c73f0ac6993f761a8b099" /sc ONLOGON /tr "'C:\Program Files (x86)\WindowsPowerShell\54b3ae8eec0c73f0ac6993f761a8b099.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3636
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "54b3ae8eec0c73f0ac6993f761a8b0995" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\WindowsPowerShell\54b3ae8eec0c73f0ac6993f761a8b099.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:520
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 13 /tr "'C:\Users\All Users\Mozilla\SppExtComObj.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4680
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Users\All Users\Mozilla\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3472
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\Mozilla\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4132
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "go-memexec-3878489337g" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows NT\TableTextService\go-memexec-3878489337.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4644
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "go-memexec-3878489337" /sc ONLOGON /tr "'C:\Program Files\Windows NT\TableTextService\go-memexec-3878489337.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2736
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "go-memexec-3878489337g" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows NT\TableTextService\go-memexec-3878489337.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4492
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 5 /tr "'C:\Program Files\Microsoft Office\PackageManifests\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4332
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office\PackageManifests\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4496
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 12 /tr "'C:\Program Files\Microsoft Office\PackageManifests\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2292

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          go-memexec-3878489337.exe

          • Path C:\Users\Admin\AppData\Local\Temp\go-memexec-3878489337.exe
          • Size 831KB
          • SHA256 1ca82d84d20a71004931e1abc59949b379b1fcd35037df5fdcb80148721fe8e8
          • MD5 SHA1 SHA512 SSDEEP

          go-memexec-3878489337.exe

          • Path C:\Users\Admin\AppData\Local\Temp\go-memexec-3878489337.exe
          • Size 831KB
          • SHA256 1ca82d84d20a71004931e1abc59949b379b1fcd35037df5fdcb80148721fe8e8
          • MD5 SHA1 SHA512 SSDEEP

          iZC2HVp7ET.bat

          • Path C:\Users\Admin\AppData\Local\Temp\iZC2HVp7ET.bat
          • Size 199B
          • SHA256 ceef9b0391df3ceefa68d5c6dfdd4a6d28ed902c399aaffc290e365e2609774f
          • MD5 SHA1 SHA512

          Registry.exe

          • Path C:\Users\Default User\Registry.exe
          • Size 831KB
          • SHA256 1ca82d84d20a71004931e1abc59949b379b1fcd35037df5fdcb80148721fe8e8
          • MD5 SHA1 SHA512 SSDEEP

          Registry.exe

          • Path C:\Users\Default\Registry.exe
          • Size 831KB
          • SHA256 1ca82d84d20a71004931e1abc59949b379b1fcd35037df5fdcb80148721fe8e8
          • MD5 SHA1 SHA512 SSDEEP

          memory/1448-138-0x00007FFD784B0000-0x00007FFD78F71000-memory.dmp

          memory/1448-136-0x00007FFD784B0000-0x00007FFD78F71000-memory.dmp

          memory/1448-135-0x00000000007C0000-0x0000000000898000-memory.dmp

          memory/1912-144-0x00007FFD783F0000-0x00007FFD78EB1000-memory.dmp

          memory/1912-145-0x00007FFD783F0000-0x00007FFD78EB1000-memory.dmp