Resubmissions

10/01/2024, 04:58

240110-fl152aeafn10

10/01/2024, 04:00

240110-ek33kaddbl10

Analysis

  • max time kernel
    136s
  • max time network
    173s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/01/2024, 04:58

General

  • Target
    4f85fd9da0e6d825b520f09905b16301.exe
  • Size 1.1MB
  • Sample240110-fl152aeafn
  • SHA256 fd9e479531a11076bfa97269d4562bda4571f3f03f00e049e3e125d82099e942
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat 21 IoCs

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

  • Process spawned unexpected child process 12 IoCs

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

  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 12 IoCs
  • Drops file in System32 directory 12 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Drops file in Windows directory 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 12 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 10 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\4f85fd9da0e6d825b520f09905b16301.exe
    "C:\Users\Admin\AppData\Local\Temp\4f85fd9da0e6d825b520f09905b16301.exe"
    1⤵
    • DcRat
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4396
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\FypuoSWXd6.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:840
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:864
        • C:\Windows\system32\w32tm.exe
          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
          3⤵
            PID:4964
          • C:\Users\Admin\AppData\Local\Temp\4f85fd9da0e6d825b520f09905b16301.exe
            "C:\Users\Admin\AppData\Local\Temp\4f85fd9da0e6d825b520f09905b16301.exe"
            3⤵
            • Checks computer location settings
            • Adds Run key to start application
            • Drops file in System32 directory
            • Drops file in Program Files directory
            • Drops file in Windows directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:752
            • C:\Windows\Resources\Ease of Access Themes\SppExtComObj.exe
              "C:\Windows\Resources\Ease of Access Themes\SppExtComObj.exe"
              4⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:5000
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost\StartMenuExperienceHost.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:400
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\hdwwiz\spoolsv.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2912
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\Windows.Media.Protection.PlayReady\dllhost.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3732
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\dmwappushsvc\spoolsv.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2768
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Documents and Settings\smss.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3784
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\All Users\Application Data\sppsvc.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2640
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\tquery\dwm.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1652
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "MusNotification" /sc ONLOGON /tr "'C:\Windows\System32\cmintegrator\MusNotification.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4540
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\Resources\Ease of Access Themes\SppExtComObj.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4316
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\microsoft-windows-battery-events\lsass.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:788
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\dllhost.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:5036
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\sysmon\explorer.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1608

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            4f85fd9da0e6d825b520f09905b16301.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\4f85fd9da0e6d825b520f09905b16301.exe.log
            • Size 1KB
            • SHA256 46386a61f3aaf1b1c2e6efc9fc7e9e9ff16cd13ae58b8d856835771fedb6d457
            • MD5 SHA1 SHA512

            FypuoSWXd6.bat

            • Path C:\Users\Admin\AppData\Local\Temp\FypuoSWXd6.bat
            • Size 286B
            • SHA256 9195ca93ff828fdaf754801f0ede43eae5c3f8802bb37e06f2c3130a7b94cc1d
            • MD5 SHA1 SHA512

            smss.exe

            • Path C:\Users\smss.exe
            • Size 1.1MB
            • SHA256 fd9e479531a11076bfa97269d4562bda4571f3f03f00e049e3e125d82099e942
            • MD5 SHA1 SHA512 SSDEEP

            memory/752-28-0x00007FF997490000-0x00007FF997F51000-memory.dmp

            memory/752-29-0x000000001B120000-0x000000001B130000-memory.dmp

            memory/752-49-0x00007FF997490000-0x00007FF997F51000-memory.dmp

            memory/4396-0-0x0000000000210000-0x0000000000332000-memory.dmp

            memory/4396-23-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/4396-25-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/4396-2-0x0000000002400000-0x0000000002410000-memory.dmp

            memory/4396-1-0x00007FF997400000-0x00007FF997EC1000-memory.dmp

            memory/5000-48-0x00007FF997490000-0x00007FF997F51000-memory.dmp

            memory/5000-50-0x000000001B3A0000-0x000000001B3B0000-memory.dmp

            memory/5000-51-0x00007FF997490000-0x00007FF997F51000-memory.dmp

            memory/5000-53-0x00007FF997490000-0x00007FF997F51000-memory.dmp