Analysis

  • max time kernel
    143s
  • max time network
    153s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20250217-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250217-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    11/03/2025, 16:14

General

  • Target
    coderoom-main/nbyosapefdkhasd.exe
  • Size 830KB
  • Sample250311-tp2gvsxpv2
  • SHA256 708b90620e944806d2ad832646b09f6b94d64935fb1eb6c056ac6da6049055d4
  • 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
  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Process spawned unexpected child process 3 IoCs

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

  • DCRat payload 2 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.

  • Checks computer location settings 2 TTPs 5 IoCs

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

  • Executes dropped EXE 5 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in System32 directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 3 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies registry class 5 IoCs
  • Runs ping.exe 1 TTPs 3 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 28 IoCs
  • Suspicious use of WriteProcessMemory 46 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\coderoom-main\nbyosapefdkhasd.exe
    "C:\Users\Admin\AppData\Local\Temp\coderoom-main\nbyosapefdkhasd.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5000
    • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\uac35gm2\uac35gm2.cmdline"
      2⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:2052
      • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESD2F0.tmp" "c:\Windows\System32\CSCB309E4F6E86D4F17AAB5ACA22F408C6B.TMP"
        3⤵
          PID:3580
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\staticfile.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1260
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\RwNJlXfOv9.bat"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2240
        • C:\Windows\system32\chcp.com
          chcp 65001
          3⤵
            PID:4052
          • C:\Windows\system32\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            3⤵
              PID:2392
            • C:\Users\Admin\AppData\Local\staticfile.exe
              "C:\Users\Admin\AppData\Local\staticfile.exe"
              3⤵
              • Checks computer location settings
              • Executes dropped EXE
              • Modifies registry class
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:3224
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\F0qtrCuOKA.bat"
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:2080
                • C:\Windows\system32\chcp.com
                  chcp 65001
                  5⤵
                    PID:3188
                  • C:\Windows\system32\w32tm.exe
                    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                    5⤵
                      PID:4900
                    • C:\Users\Admin\AppData\Local\staticfile.exe
                      "C:\Users\Admin\AppData\Local\staticfile.exe"
                      5⤵
                      • Checks computer location settings
                      • Executes dropped EXE
                      • Modifies registry class
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of WriteProcessMemory
                      PID:4756
                      • C:\Windows\System32\cmd.exe
                        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\jD9ngJpyTM.bat"
                        6⤵
                        • Suspicious use of WriteProcessMemory
                        PID:876
                        • C:\Windows\system32\chcp.com
                          chcp 65001
                          7⤵
                            PID:2840
                          • C:\Windows\system32\PING.EXE
                            ping -n 10 localhost
                            7⤵
                            • System Network Configuration Discovery: Internet Connection Discovery
                            • Runs ping.exe
                            PID:5100
                          • C:\Users\Admin\AppData\Local\staticfile.exe
                            "C:\Users\Admin\AppData\Local\staticfile.exe"
                            7⤵
                            • Checks computer location settings
                            • Executes dropped EXE
                            • Modifies registry class
                            • Suspicious use of AdjustPrivilegeToken
                            • Suspicious use of WriteProcessMemory
                            PID:1392
                            • C:\Windows\System32\cmd.exe
                              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\yUaH2NNloo.bat"
                              8⤵
                              • Suspicious use of WriteProcessMemory
                              PID:5000
                              • C:\Windows\system32\chcp.com
                                chcp 65001
                                9⤵
                                  PID:3888
                                • C:\Windows\system32\PING.EXE
                                  ping -n 10 localhost
                                  9⤵
                                  • System Network Configuration Discovery: Internet Connection Discovery
                                  • Runs ping.exe
                                  PID:1064
                                • C:\Users\Admin\AppData\Local\staticfile.exe
                                  "C:\Users\Admin\AppData\Local\staticfile.exe"
                                  9⤵
                                  • Checks computer location settings
                                  • Executes dropped EXE
                                  • Modifies registry class
                                  • Suspicious use of AdjustPrivilegeToken
                                  • Suspicious use of WriteProcessMemory
                                  PID:3780
                                  • C:\Windows\System32\cmd.exe
                                    "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\qPEz3ygwJT.bat"
                                    10⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:3428
                                    • C:\Windows\system32\chcp.com
                                      chcp 65001
                                      11⤵
                                        PID:3148
                                      • C:\Windows\system32\PING.EXE
                                        ping -n 10 localhost
                                        11⤵
                                        • System Network Configuration Discovery: Internet Connection Discovery
                                        • Runs ping.exe
                                        PID:4668
                                      • C:\Users\Admin\AppData\Local\staticfile.exe
                                        "C:\Users\Admin\AppData\Local\staticfile.exe"
                                        11⤵
                                        • Executes dropped EXE
                                        • Suspicious use of AdjustPrivilegeToken
                                        PID:4112
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "staticfiles" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\AppData\Local\staticfile.exe'" /f
                    1⤵
                    • Process spawned unexpected child process
                    • Scheduled Task/Job: Scheduled Task
                    PID:3348
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "staticfile" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\staticfile.exe'" /rl HIGHEST /f
                    1⤵
                    • Process spawned unexpected child process
                    • Scheduled Task/Job: Scheduled Task
                    PID:380
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "staticfiles" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\AppData\Local\staticfile.exe'" /rl HIGHEST /f
                    1⤵
                    • Process spawned unexpected child process
                    • Scheduled Task/Job: Scheduled Task
                    PID:2152

                  Network

                        MITRE ATT&CK Enterprise v15

                        Replay Monitor

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                        Downloads

                        staticfile.exe.log

                        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\staticfile.exe.log
                        • Size 1KB
                        • SHA256 fe0cfcd7729f9a68f46afcb3b105fdf637099b6043a41d9a27ed9bb5b281826a
                        • MD5 SHA1 SHA512

                        F0qtrCuOKA.bat

                        • Path C:\Users\Admin\AppData\Local\Temp\F0qtrCuOKA.bat
                        • Size 219B
                        • SHA256 80ff17cd41a6d37bd82222d29f1cbe0bf4f8748895897b4b9ca7ff40cd664d5a
                        • MD5 SHA1 SHA512

                        RESD2F0.tmp

                        • Path C:\Users\Admin\AppData\Local\Temp\RESD2F0.tmp
                        • Size 1KB
                        • SHA256 75c922639dc7bb6d05c1ada6a6e6133f4a26c98ebecf62b107dc0d509e76825e
                        • MD5 SHA1 SHA512

                        RwNJlXfOv9.bat

                        • Path C:\Users\Admin\AppData\Local\Temp\RwNJlXfOv9.bat
                        • Size 219B
                        • SHA256 88bba5d7bae94126556162dffd8796b3dec87b8ab5b6647bcc199e0162937783
                        • MD5 SHA1 SHA512

                        __PSScriptPolicyTest_lnbppvep.rvx.ps1

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

                        jD9ngJpyTM.bat

                        • Path C:\Users\Admin\AppData\Local\Temp\jD9ngJpyTM.bat
                        • Size 171B
                        • SHA256 0fecf3047eab7b812499af1f075382b9b22df52be1be096b95670df4d31f570a
                        • MD5 SHA1 SHA512

                        qPEz3ygwJT.bat

                        • Path C:\Users\Admin\AppData\Local\Temp\qPEz3ygwJT.bat
                        • Size 171B
                        • SHA256 3f6aa66f155d502ccf252de1244dbe519c17644aaa9bae63eb45cab020768f0f
                        • MD5 SHA1 SHA512

                        yUaH2NNloo.bat

                        • Path C:\Users\Admin\AppData\Local\Temp\yUaH2NNloo.bat
                        • Size 171B
                        • SHA256 3fa20cc61913e372c01cea1d3178deda8487ee0a3f4c618498f6c99d0a1c900a
                        • MD5 SHA1 SHA512

                        staticfile.exe

                        • Path C:\Users\Admin\AppData\Local\staticfile.exe
                        • Size 830KB
                        • SHA256 708b90620e944806d2ad832646b09f6b94d64935fb1eb6c056ac6da6049055d4
                        • MD5 SHA1 SHA512 SSDEEP

                        uac35gm2.0.cs

                        • Path \??\c:\Users\Admin\AppData\Local\Temp\uac35gm2\uac35gm2.0.cs
                        • Size 375B
                        • SHA256 68c25434c9155aed2cb20b7f365b8d5c35737f60729280e2badd513855027ff2
                        • MD5 SHA1 SHA512

                        uac35gm2.cmdline

                        • Path \??\c:\Users\Admin\AppData\Local\Temp\uac35gm2\uac35gm2.cmdline
                        • Size 235B
                        • SHA256 85d2c57a6ccbec19334b3e8f8bd76c04e590905eab7cf86da560fe11d9ca80bb
                        • MD5 SHA1 SHA512

                        CSCB309E4F6E86D4F17AAB5ACA22F408C6B.TMP

                        • Path \??\c:\Windows\System32\CSCB309E4F6E86D4F17AAB5ACA22F408C6B.TMP
                        • Size 1KB
                        • SHA256 f9dfbc19eb92450454bfc1d1e3f301a106c6451e167118f8fcd8290706d53dd2
                        • MD5 SHA1 SHA512

                        memory/1260-47-0x000001B87DAA0000-0x000001B87DAC2000-memory.dmp

                        memory/1392-101-0x00000000013D0000-0x00000000013D8000-memory.dmp

                        memory/1392-110-0x00000000013D0000-0x00000000013D8000-memory.dmp

                        memory/3224-73-0x0000000002DE0000-0x0000000002DE8000-memory.dmp

                        memory/3224-63-0x0000000002DE0000-0x0000000002DE8000-memory.dmp

                        memory/3780-119-0x0000000002B00000-0x0000000002B08000-memory.dmp

                        memory/3780-128-0x0000000002B00000-0x0000000002B08000-memory.dmp

                        memory/4112-137-0x000000001AE90000-0x000000001AE98000-memory.dmp

                        memory/4756-83-0x000000001C230000-0x000000001C238000-memory.dmp

                        memory/4756-92-0x000000001C230000-0x000000001C238000-memory.dmp

                        memory/5000-4-0x0000000000A80000-0x0000000000A8E000-memory.dmp

                        memory/5000-52-0x00007FFC5F120000-0x00007FFC5FBE2000-memory.dmp

                        memory/5000-0-0x00007FFC5F123000-0x00007FFC5F125000-memory.dmp

                        memory/5000-2-0x00007FFC5F120000-0x00007FFC5FBE2000-memory.dmp

                        memory/5000-21-0x00007FFC5F120000-0x00007FFC5FBE2000-memory.dmp

                        memory/5000-1-0x0000000000200000-0x00000000002D6000-memory.dmp

                        memory/5000-20-0x00007FFC5F120000-0x00007FFC5FBE2000-memory.dmp

                        memory/5000-18-0x00007FFC5F120000-0x00007FFC5FBE2000-memory.dmp

                        memory/5000-13-0x0000000000B30000-0x0000000000B3E000-memory.dmp

                        memory/5000-17-0x0000000000CC0000-0x0000000000CCC000-memory.dmp

                        memory/5000-15-0x0000000000B40000-0x0000000000B4C000-memory.dmp

                        memory/5000-11-0x0000000000B50000-0x0000000000B68000-memory.dmp

                        memory/5000-8-0x0000000000B00000-0x0000000000B1C000-memory.dmp

                        memory/5000-9-0x0000000000CD0000-0x0000000000D20000-memory.dmp

                        memory/5000-7-0x00007FFC5F120000-0x00007FFC5FBE2000-memory.dmp

                        memory/5000-6-0x0000000000AB0000-0x0000000000ACC000-memory.dmp