Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-12-2024 07:46

General

  • Target

    3c439a0dac41ce86b80a6b1f2eb8908b.exe

  • Size

    2.2MB

  • MD5

    3c439a0dac41ce86b80a6b1f2eb8908b

  • SHA1

    1ed48a383c839bf2f601c63e237b02bf532c5f4a

  • SHA256

    366f3a7eb764ad2e8b8bd1ebcf389cbfad6034f4c6257f1cdd21a7a3cac768eb

  • SHA512

    4c446ed60f907b496a5246371f6afb6b7c39d52e5eb89c20cb4aed402de0b8947441badbd7a8ffe17ca38f910538b71f7ee03aec8c8ee463a529395eb5e8af00

  • SSDEEP

    24576:BIKJvchtNfuWMqI/+Q0uwPTJ7CVhqbYziqp66B2eNizXR6yPp+oUP2mBXrp8AfiM:hJiB20rrsiqp6W22ITCdt85aBtuEg

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 21 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in Program Files directory 7 IoCs
  • Drops file in Windows directory 3 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 21 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • System policy modification 1 TTPs 6 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\3c439a0dac41ce86b80a6b1f2eb8908b.exe
    "C:\Users\Admin\AppData\Local\Temp\3c439a0dac41ce86b80a6b1f2eb8908b.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Checks whether UAC is enabled
    • 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
    • System policy modification
    PID:3928
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Yy7llSmZCu.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1404
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2320
        • C:\Windows\PLA\Templates\wininit.exe
          "C:\Windows\PLA\Templates\wininit.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • System policy modification
          PID:3124
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\sppsvc.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2820
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3940
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4172
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 11 /tr "'C:\Windows\PLA\Templates\wininit.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3344
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\PLA\Templates\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3368
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Windows\PLA\Templates\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1360
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3532
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4084
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:752
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3328
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:544
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2624
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2580
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:384
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3764
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\Users\Default\Pictures\fontdrvhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2412
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Default\Pictures\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:596
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Users\Default\Pictures\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3624
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\smss.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4928
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Users\All Users\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2188
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "smsss" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\smss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:928

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\sihost.exe

      Filesize

      2.2MB

      MD5

      3c439a0dac41ce86b80a6b1f2eb8908b

      SHA1

      1ed48a383c839bf2f601c63e237b02bf532c5f4a

      SHA256

      366f3a7eb764ad2e8b8bd1ebcf389cbfad6034f4c6257f1cdd21a7a3cac768eb

      SHA512

      4c446ed60f907b496a5246371f6afb6b7c39d52e5eb89c20cb4aed402de0b8947441badbd7a8ffe17ca38f910538b71f7ee03aec8c8ee463a529395eb5e8af00

    • C:\Users\Admin\AppData\Local\Temp\Yy7llSmZCu.bat

      Filesize

      201B

      MD5

      3ee7d53fe233f1e492dccec4f6baf9eb

      SHA1

      4ce602a7f2ba21815bd85e2b3aa79dba5905ef69

      SHA256

      46415f96ed44e08cc8b6cce0636a76c80582c2bc5d8decc7f0bcc0818bda7b4b

      SHA512

      e972ce4652598d52531b2c9e2a515a5e081307db112e1abeaee9dc8021f20718d89aad329eee1fb914446a03e00ee4401ea63ec73ea1ee9fd0d806f423e75691

    • memory/3928-0-0x00007FF95A713000-0x00007FF95A715000-memory.dmp

      Filesize

      8KB

    • memory/3928-1-0x0000000000280000-0x00000000004BA000-memory.dmp

      Filesize

      2.2MB

    • memory/3928-2-0x00007FF95A710000-0x00007FF95B1D1000-memory.dmp

      Filesize

      10.8MB

    • memory/3928-3-0x0000000002590000-0x00000000025AC000-memory.dmp

      Filesize

      112KB

    • memory/3928-4-0x000000001B7B0000-0x000000001B800000-memory.dmp

      Filesize

      320KB

    • memory/3928-5-0x000000001B0F0000-0x000000001B106000-memory.dmp

      Filesize

      88KB

    • memory/3928-6-0x0000000000C80000-0x0000000000C8A000-memory.dmp

      Filesize

      40KB

    • memory/3928-7-0x000000001B140000-0x000000001B196000-memory.dmp

      Filesize

      344KB

    • memory/3928-8-0x0000000002700000-0x000000000270C000-memory.dmp

      Filesize

      48KB

    • memory/3928-28-0x00007FF95A710000-0x00007FF95B1D1000-memory.dmp

      Filesize

      10.8MB