Analysis

  • max time kernel
    93s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/01/2025, 14:06

General

  • Target
    6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe
  • Size 2.6MB
  • Sample250120-redxpssqen
  • SHA256 6b4372f45d14a2f2b5d64d153e31b65436936921bceeeb8b01585f71a8c0e1bf
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 17 IoCs

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

  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 4 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 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.

Processes

  • C:\Users\Admin\AppData\Local\Temp\6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe
    "C:\Users\Admin\AppData\Local\Temp\6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1116
    • C:\Users\Admin\AppData\Roaming\Install_JJSploit16.8.exe
      "C:\Users\Admin\AppData\Roaming\Install_JJSploit16.8.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:692
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Runtimehost\MYWzp0a6xwrEK5S4UF.vbe"
        3⤵
        • Checks computer location settings
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4136
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Runtimehost\pQImPX9m1y2f8C.bat" "
          4⤵
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:4876
          • C:\Runtimehost\chainsavesref.exe
            "C:\Runtimehost\chainsavesref.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 AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1664
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\QLNjhu5Rlm.bat"
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:868
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:640
                • C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe
                  "C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2776
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Runtimehost\file.vbs"
          3⤵
          • System Location Discovery: System Language Discovery
          PID:3164
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\Users\Public\sihost.exe'" /f
      1⤵
      • Scheduled Task/Job: Scheduled Task
      PID:5068
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\Public\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3504
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Users\Public\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:420
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wscriptw" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\wscript.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2548
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wscript" /sc ONLOGON /tr "'C:\Users\Default User\wscript.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4924
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wscriptw" /sc MINUTE /mo 8 /tr "'C:\Users\Default User\wscript.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3112
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Runtimehost\fontdrvhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4156
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Runtimehost\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4476
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Runtimehost\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2952
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5012
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3484
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2032
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Windows\SKB\LanguageModels\fontdrvhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3672
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\SKB\LanguageModels\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4104
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\Windows\SKB\LanguageModels\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4816
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 12 /tr "'C:\Windows\Cursors\TextInputHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:5016
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Windows\Cursors\TextInputHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2056
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 7 /tr "'C:\Windows\Cursors\TextInputHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1300

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          MYWzp0a6xwrEK5S4UF.vbe

          • Path C:\Runtimehost\MYWzp0a6xwrEK5S4UF.vbe
          • Size 202B
          • SHA256 4b3af66a1c0ed2ef1bf7b55ca6940cada614229200dae62024b03c08b7f843d6
          • MD5 SHA1 SHA512

          chainsavesref.exe

          • Path C:\Runtimehost\chainsavesref.exe
          • Size 2.3MB
          • SHA256 f817634c1236f507c749742bd1bae393b74d2d29620128ecc50037205f175cc7
          • MD5 SHA1 SHA512 SSDEEP

          file.vbs

          • Path C:\Runtimehost\file.vbs
          • Size 34B
          • SHA256 f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b
          • MD5 SHA1 SHA512

          pQImPX9m1y2f8C.bat

          • Path C:\Runtimehost\pQImPX9m1y2f8C.bat
          • Size 34B
          • SHA256 704a1a651e6b566a4a0e54d95de33d5c55a330d75c0b4456b3fa4c2ba4718a97
          • MD5 SHA1 SHA512

          QLNjhu5Rlm.bat

          • Path C:\Users\Admin\AppData\Local\Temp\QLNjhu5Rlm.bat
          • Size 240B
          • SHA256 6cfd761b2be81c69ccf9e337cdc40002dc847ce7063a0380b8ead3f1da109f51
          • MD5 SHA1 SHA512

          Install_JJSploit16.8.exe

          • Path C:\Users\Admin\AppData\Roaming\Install_JJSploit16.8.exe
          • Size 2.6MB
          • SHA256 50d21266acc179352743c1bf14ada681f4f6517ed240ac1ded4f094a1248a95c
          • MD5 SHA1 SHA512 SSDEEP

          memory/1116-0-0x00007FFDF20F3000-0x00007FFDF20F5000-memory.dmp

          memory/1116-1-0x0000000000BF0000-0x0000000000E94000-memory.dmp

          memory/1664-32-0x000000001C350000-0x000000001C3A6000-memory.dmp

          memory/1664-31-0x000000001BD00000-0x000000001BD16000-memory.dmp

          memory/1664-30-0x000000001C3A0000-0x000000001C3F0000-memory.dmp

          memory/1664-29-0x000000001BCE0000-0x000000001BCFC000-memory.dmp

          memory/1664-33-0x000000001BD20000-0x000000001BD32000-memory.dmp

          memory/1664-37-0x000000001C430000-0x000000001C438000-memory.dmp

          memory/1664-36-0x000000001C420000-0x000000001C428000-memory.dmp

          memory/1664-35-0x000000001C410000-0x000000001C41E000-memory.dmp

          memory/1664-34-0x000000001CC70000-0x000000001D198000-memory.dmp

          memory/1664-28-0x0000000000F90000-0x00000000011E2000-memory.dmp

          memory/2776-59-0x000000001D5A0000-0x000000001D5F6000-memory.dmp

          memory/2776-60-0x000000001D5F0000-0x000000001D602000-memory.dmp