Resubmissions

14/04/2025, 07:51

250414-jp1kfssjz9 10

14/04/2025, 07:46

250414-jl9nyssjt9 10

08/04/2025, 15:58

250408-tevasswl18 10

08/04/2025, 14:19

250408-rm2nqsvqw2 10

Analysis

  • max time kernel
    103s
  • max time network
    140s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250314-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/04/2025, 14:19

General

  • Target

    fa942bbb984e2be3a2e1d8414cc00cd7.exe

  • Size

    984KB

  • MD5

    fa942bbb984e2be3a2e1d8414cc00cd7

  • SHA1

    822821106f149cbc674cccf5d8cc1aec612bb8f4

  • SHA256

    07419cc322e8ed4baae30a8ba72afc56634175dd54b57c513112e420a9cc69b4

  • SHA512

    57f062fa5d5fbfa9ebba4ca401e42954b0ed16ec7bc4f28bc6ca00b06e273bbe6dbcab895fc6e460262fcb42cd3a0705a61bb4de2d8a2a08baabb738868af2dc

  • SSDEEP

    12288:zzZvuvewk/0pPPXA5q/TQ9+n95vV25gnwHexSDwbwvDxlpaS98IUNldnd65EgF1s:zzZvuGD2PvA5YxwmbZB6Uv

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 10 IoCs

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

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 11 IoCs
  • Adds Run key to start application 2 TTPs 10 IoCs
  • Drops file in System32 directory 12 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 10 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of WriteProcessMemory 26 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\fa942bbb984e2be3a2e1d8414cc00cd7.exe
    "C:\Users\Admin\AppData\Local\Temp\fa942bbb984e2be3a2e1d8414cc00cd7.exe"
    1⤵
    • 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
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3884
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\IVwKE84btE.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3732
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:3436
        • C:\Windows\System32\XAudio2_9\winlogon.exe
          "C:\Windows\System32\XAudio2_9\winlogon.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:4564
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\c2c7c62e3dd3bcbd2ee6d4\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2428
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\c2c7c62e3dd3bcbd2ee6d4\csrss.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1312
      • C:\c2c7c62e3dd3bcbd2ee6d4\csrss.exe
        C:\c2c7c62e3dd3bcbd2ee6d4\csrss.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:3164
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\inetcomm\dwm.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4208
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Windows\System32\inetcomm\dwm.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1276
      • C:\Windows\System32\inetcomm\dwm.exe
        C:\Windows\System32\inetcomm\dwm.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2748
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\netprofm\unsecapp.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1380
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Windows\System32\wbem\netprofm\unsecapp.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:4412
      • C:\Windows\System32\wbem\netprofm\unsecapp.exe
        C:\Windows\System32\wbem\netprofm\unsecapp.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4268
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fa942bbb984e2be3a2e1d8414cc00cd7" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\f62837f3bc66012b94d74cc471f3d97a\fa942bbb984e2be3a2e1d8414cc00cd7.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4908
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\f62837f3bc66012b94d74cc471f3d97a\fa942bbb984e2be3a2e1d8414cc00cd7.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1504
      • C:\Users\Admin\AppData\Local\Temp\f62837f3bc66012b94d74cc471f3d97a\fa942bbb984e2be3a2e1d8414cc00cd7.exe
        C:\Users\Admin\AppData\Local\Temp\f62837f3bc66012b94d74cc471f3d97a\fa942bbb984e2be3a2e1d8414cc00cd7.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4476
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\SchCache\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1512
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Windows\SchCache\dllhost.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:3704
      • C:\Windows\SchCache\dllhost.exe
        C:\Windows\SchCache\dllhost.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2992
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.kk-kz\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3656
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.kk-kz\OfficeClickToRun.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:3584
      • C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.kk-kz\OfficeClickToRun.exe
        "C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.kk-kz\OfficeClickToRun.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:3840
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2024
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Windows\Offline Web Pages\csrss.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:3124
      • C:\Windows\Offline Web Pages\csrss.exe
        "C:\Windows\Offline Web Pages\csrss.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4912
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\XAudio2_9\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2684
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Documents and Settings\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3096
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Windows\System32\XAudio2_9\winlogon.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:4016
      • C:\Windows\System32\XAudio2_9\winlogon.exe
        C:\Windows\System32\XAudio2_9\winlogon.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:3484
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\Documents and Settings\dllhost.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1588
      • C:\Documents and Settings\dllhost.exe
        "C:\Documents and Settings\dllhost.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:712
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\a5520cf74cedd2462ce392906afc\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3796
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c "C:\a5520cf74cedd2462ce392906afc\dllhost.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1156
      • C:\a5520cf74cedd2462ce392906afc\dllhost.exe
        C:\a5520cf74cedd2462ce392906afc\dllhost.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1560

    Network

    MITRE ATT&CK Enterprise v16

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\fa942bbb984e2be3a2e1d8414cc00cd7.exe.log

      Filesize

      1KB

      MD5

      bbb951a34b516b66451218a3ec3b0ae1

      SHA1

      7393835a2476ae655916e0a9687eeaba3ee876e9

      SHA256

      eb70c64ae99d14ac2588b7a84854fbf3c420532d7fe4dfd49c7b5a70c869943a

      SHA512

      63bcbfcf8e7421c66855c487c31b2991a989bdea0c1edd4c40066b52fa3eb3d9d37db1cd21b8eb4f33dd5870cc20532c8f485eab9c0b4f6b0793a35c077f2d6f

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\winlogon.exe.log

      Filesize

      1KB

      MD5

      baf55b95da4a601229647f25dad12878

      SHA1

      abc16954ebfd213733c4493fc1910164d825cac8

      SHA256

      ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

      SHA512

      24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

    • C:\Users\Admin\AppData\Local\Temp\IVwKE84btE.bat

      Filesize

      206B

      MD5

      443b952390ed2c5e55dcb75f14fc384f

      SHA1

      d7b16bfbc310f55ca1ed58167a449552eff14a7b

      SHA256

      7abf58c795fddb34e42af415ba613ba6642da4a07ef1452b97d6d38294ecbb7b

      SHA512

      d0bd0194f7b4be48d00db7c16f37c2b086ace7ee3e4c7f2eb37ba2585a08e448bc7eba66d200fbeb35da2a9e41fc66f5ee35eb493ad89dc3ff61156e397254b3

    • C:\Windows\SchCache\dllhost.exe

      Filesize

      984KB

      MD5

      fa942bbb984e2be3a2e1d8414cc00cd7

      SHA1

      822821106f149cbc674cccf5d8cc1aec612bb8f4

      SHA256

      07419cc322e8ed4baae30a8ba72afc56634175dd54b57c513112e420a9cc69b4

      SHA512

      57f062fa5d5fbfa9ebba4ca401e42954b0ed16ec7bc4f28bc6ca00b06e273bbe6dbcab895fc6e460262fcb42cd3a0705a61bb4de2d8a2a08baabb738868af2dc

    • memory/3884-10-0x00000000010D0000-0x00000000010E2000-memory.dmp

      Filesize

      72KB

    • memory/3884-11-0x000000001C200000-0x000000001C728000-memory.dmp

      Filesize

      5.2MB

    • memory/3884-8-0x0000000000F60000-0x0000000000F70000-memory.dmp

      Filesize

      64KB

    • memory/3884-7-0x0000000000F50000-0x0000000000F58000-memory.dmp

      Filesize

      32KB

    • memory/3884-6-0x0000000000F30000-0x0000000000F40000-memory.dmp

      Filesize

      64KB

    • memory/3884-9-0x00000000010C0000-0x00000000010CC000-memory.dmp

      Filesize

      48KB

    • memory/3884-0-0x00007FFD9C9D3000-0x00007FFD9C9D5000-memory.dmp

      Filesize

      8KB

    • memory/3884-5-0x0000000000CB0000-0x0000000000CC0000-memory.dmp

      Filesize

      64KB

    • memory/3884-12-0x0000000001110000-0x000000000111C000-memory.dmp

      Filesize

      48KB

    • memory/3884-4-0x000000001B410000-0x000000001B460000-memory.dmp

      Filesize

      320KB

    • memory/3884-3-0x0000000000F10000-0x0000000000F2C000-memory.dmp

      Filesize

      112KB

    • memory/3884-102-0x00007FFD9C9D0000-0x00007FFD9D491000-memory.dmp

      Filesize

      10.8MB

    • memory/3884-2-0x00007FFD9C9D0000-0x00007FFD9D491000-memory.dmp

      Filesize

      10.8MB

    • memory/3884-1-0x0000000000610000-0x000000000070C000-memory.dmp

      Filesize

      1008KB

    • memory/4564-114-0x000000001BE90000-0x000000001BF92000-memory.dmp

      Filesize

      1.0MB

    • memory/4564-115-0x000000001BE90000-0x000000001BF92000-memory.dmp

      Filesize

      1.0MB