Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    24-04-2024 22:49

General

  • Target

    fab1001a7271caa76ddcb934ff2668bdc1f5e044a7065b7c143c429c98aba056.exe

  • Size

    2.0MB

  • MD5

    96373b1a9080aa751b5a98fc96cfb66c

  • SHA1

    17436af89fdf67d4c60416b7bccda9f6cb3cd490

  • SHA256

    fab1001a7271caa76ddcb934ff2668bdc1f5e044a7065b7c143c429c98aba056

  • SHA512

    4cacede2b67488e46c978cbd1956ed4c0b0c1657bdd3e9b9a80203bb1175fb0b2aceadd8dbedef331332d578191620435e9561b56db420b28b767ba2dfdc9f79

  • SSDEEP

    24576:0n2XTCHM4xT9V3XzsHhVmatCELYIXVelAtgbHHd:iaTUv0jmtEttc

Malware Config

Signatures

  • DcRat 14 IoCs

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

  • Modifies WinLogon for persistence 2 TTPs 4 IoCs
  • Process spawned unexpected child process 12 IoCs

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

  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Detects executables containing bas64 encoded gzip files 4 IoCs
  • Detects executables packed with SmartAssembly 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 8 IoCs
  • Drops file in Program Files directory 10 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.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 9 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\fab1001a7271caa76ddcb934ff2668bdc1f5e044a7065b7c143c429c98aba056.exe
    "C:\Users\Admin\AppData\Local\Temp\fab1001a7271caa76ddcb934ff2668bdc1f5e044a7065b7c143c429c98aba056.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2660
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\ITN63wlJdh.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1868
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:1556
        • C:\Users\Default User\taskhost.exe
          "C:\Users\Default User\taskhost.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2364
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\it-IT\wininit.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2672
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\TableTextService\it-IT\wininit.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2624
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\it-IT\wininit.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3052
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\taskhost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2060
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Users\Default User\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2492
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 6 /tr "'C:\Users\Default User\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2708
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 8 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\sppsvc.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2468
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2488
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 11 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2592
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\dwm.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3044
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2308
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1860

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\ITN63wlJdh.bat

      Filesize

      199B

      MD5

      b6a927125b9bbc279dc58265f98941df

      SHA1

      7d213f88748ea9084851e74ce3ca159fdf859a18

      SHA256

      514f0bc67a16b4b218dcb27289927d3275b17299b40e0561d1db9723d6e7646b

      SHA512

      25f7b34631b76815cb28236863063f194856db66d87e582d8ea4f2ed14bd7a838494620d5a2d410e5e85c593e869b74fd320e770052fef466c2819bd76d7ca8f

    • C:\Users\Admin\AppData\Local\Temp\RCXC9F.tmp

      Filesize

      2.0MB

      MD5

      96373b1a9080aa751b5a98fc96cfb66c

      SHA1

      17436af89fdf67d4c60416b7bccda9f6cb3cd490

      SHA256

      fab1001a7271caa76ddcb934ff2668bdc1f5e044a7065b7c143c429c98aba056

      SHA512

      4cacede2b67488e46c978cbd1956ed4c0b0c1657bdd3e9b9a80203bb1175fb0b2aceadd8dbedef331332d578191620435e9561b56db420b28b767ba2dfdc9f79

    • C:\Users\Default\taskhost.exe

      Filesize

      2.0MB

      MD5

      0ae07181dade340fe4ab0ac43da9ded2

      SHA1

      010a151b009406c00ea5ebf731bbfbadce80fbba

      SHA256

      cc158358cb60dd1e69e4bb1d66bc30206b91de4337bf297758e99f3fcc677fdc

      SHA512

      4bd2cbb4fb6491626fa1b576fbe389aa9520cd1ac1dd90f135ffd810489109c18c8e92a583b88279394c2384ab246044e3e091bed500bae517ccdabac3d66f6d

    • memory/2364-87-0x000007FEF51A0000-0x000007FEF5B8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2364-86-0x000000001AAA0000-0x000000001AB20000-memory.dmp

      Filesize

      512KB

    • memory/2364-85-0x000007FEF51A0000-0x000007FEF5B8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2364-84-0x0000000000E80000-0x000000000108C000-memory.dmp

      Filesize

      2.0MB

    • memory/2660-5-0x0000000000270000-0x0000000000280000-memory.dmp

      Filesize

      64KB

    • memory/2660-7-0x00000000006D0000-0x0000000000726000-memory.dmp

      Filesize

      344KB

    • memory/2660-9-0x00000000004B0000-0x00000000004BC000-memory.dmp

      Filesize

      48KB

    • memory/2660-10-0x00000000004C0000-0x00000000004CC000-memory.dmp

      Filesize

      48KB

    • memory/2660-11-0x00000000004D0000-0x00000000004DE000-memory.dmp

      Filesize

      56KB

    • memory/2660-12-0x00000000004E0000-0x00000000004EE000-memory.dmp

      Filesize

      56KB

    • memory/2660-13-0x0000000000530000-0x000000000053A000-memory.dmp

      Filesize

      40KB

    • memory/2660-8-0x0000000000320000-0x000000000032C000-memory.dmp

      Filesize

      48KB

    • memory/2660-6-0x0000000000300000-0x0000000000316000-memory.dmp

      Filesize

      88KB

    • memory/2660-0-0x0000000000D70000-0x0000000000F7C000-memory.dmp

      Filesize

      2.0MB

    • memory/2660-81-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

      Filesize

      9.9MB

    • memory/2660-4-0x0000000000260000-0x0000000000268000-memory.dmp

      Filesize

      32KB

    • memory/2660-3-0x0000000000240000-0x000000000025C000-memory.dmp

      Filesize

      112KB

    • memory/2660-2-0x000000001B420000-0x000000001B4A0000-memory.dmp

      Filesize

      512KB

    • memory/2660-1-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

      Filesize

      9.9MB