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Analysis

  • max time kernel
    93s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/01/2025, 07:31

General

  • Target

    bff0c8f8a2a52c5e513e11004bf1216b50437e15bd21e388915a50438ceb5e60.exe

  • Size

    783KB

  • MD5

    28560c7a4324489a3e885ea4cdd456b4

  • SHA1

    d1cd68c4d65ee23cb7dc39d6e88362c88d3d6fa4

  • SHA256

    bff0c8f8a2a52c5e513e11004bf1216b50437e15bd21e388915a50438ceb5e60

  • SHA512

    fe0cde74e2c8b6187e152c144311c431ec54edf9f5e73d43b18c362a6478c8ee250ab745206d909832f2a697b0d5ff92953149592f93070249eb705a65314b1a

  • SSDEEP

    12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:G+OQbpbgsFdAyQvzSqaq8q

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 7 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 4 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
  • Adds Run key to start application 2 TTPs 7 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in System32 directory 16 IoCs
  • Drops file in Program Files directory 4 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 7 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 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\bff0c8f8a2a52c5e513e11004bf1216b50437e15bd21e388915a50438ceb5e60.exe
    "C:\Users\Admin\AppData\Local\Temp\bff0c8f8a2a52c5e513e11004bf1216b50437e15bd21e388915a50438ceb5e60.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:5096
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\K4reKW5tGc.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4636
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:4464
        • C:\Windows\System32\kbdarmty\SppExtComObj.exe
          "C:\Windows\System32\kbdarmty\SppExtComObj.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • System policy modification
          PID:2168
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MusNotification" /sc ONLOGON /tr "'C:\Windows\System32\C_20880\MusNotification.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1616
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\PeerDistHttpTrans\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4604
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Program Files\MSBuild\SearchApp.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1832
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Documents and Settings\sysmon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3004
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\MbaeApi\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2172
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Windows\System32\kbdarmty\SppExtComObj.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2612
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Users\Admin\Downloads\spoolsv.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:632

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\K4reKW5tGc.bat

      Filesize

      209B

      MD5

      57ed84eb5b6d1f826e91388403aba30b

      SHA1

      153551e9dbbf5f95bf9c078df02b86d8413ced33

      SHA256

      b79e63d5ef868d4b2b1bde3f28977f0c1e9f74537746e22759d5162a0e977c9d

      SHA512

      cbcf774663e718a069ce8bf3ad526a4632e038dc3225bf4805271dcccb5bb819942d77c3e06880a0a3a2d4994285cfff4e52efa1b4d45c55ead52599f51745a6

    • C:\Windows\System32\MbaeApi\RuntimeBroker.exe

      Filesize

      783KB

      MD5

      28560c7a4324489a3e885ea4cdd456b4

      SHA1

      d1cd68c4d65ee23cb7dc39d6e88362c88d3d6fa4

      SHA256

      bff0c8f8a2a52c5e513e11004bf1216b50437e15bd21e388915a50438ceb5e60

      SHA512

      fe0cde74e2c8b6187e152c144311c431ec54edf9f5e73d43b18c362a6478c8ee250ab745206d909832f2a697b0d5ff92953149592f93070249eb705a65314b1a

    • C:\Windows\System32\kbdarmty\SppExtComObj.exe

      Filesize

      783KB

      MD5

      7b44fda752879cfbe486e3ac426164ef

      SHA1

      a9e1b20f5883c644c0f1dbda19a7ede1416b8ec2

      SHA256

      b2bba962594c2ae7b97a095916532233e2a82fc91b3e7b44f472156214e14dde

      SHA512

      87d21d63f33684ed27930b94f27b565e6deef0ace23721b41fadfaf021bc8983d1c85cd3f0b61e1080ea55a0e3d3e830dea301f01b0a024cbde1bec26631ed95

    • memory/2168-101-0x0000000000330000-0x00000000003FA000-memory.dmp

      Filesize

      808KB

    • memory/5096-20-0x000000001B520000-0x000000001B528000-memory.dmp

      Filesize

      32KB

    • memory/5096-22-0x000000001B540000-0x000000001B548000-memory.dmp

      Filesize

      32KB

    • memory/5096-6-0x0000000002850000-0x0000000002858000-memory.dmp

      Filesize

      32KB

    • memory/5096-7-0x0000000002840000-0x000000000284C000-memory.dmp

      Filesize

      48KB

    • memory/5096-8-0x0000000002870000-0x000000000287A000-memory.dmp

      Filesize

      40KB

    • memory/5096-9-0x0000000002880000-0x000000000288A000-memory.dmp

      Filesize

      40KB

    • memory/5096-11-0x000000001B270000-0x000000001B278000-memory.dmp

      Filesize

      32KB

    • memory/5096-10-0x000000001B280000-0x000000001B288000-memory.dmp

      Filesize

      32KB

    • memory/5096-12-0x000000001B290000-0x000000001B298000-memory.dmp

      Filesize

      32KB

    • memory/5096-14-0x000000001B2B0000-0x000000001B2B8000-memory.dmp

      Filesize

      32KB

    • memory/5096-17-0x000000001B2E0000-0x000000001B2E8000-memory.dmp

      Filesize

      32KB

    • memory/5096-18-0x000000001B2F0000-0x000000001B2F8000-memory.dmp

      Filesize

      32KB

    • memory/5096-0-0x00007FFF703D3000-0x00007FFF703D5000-memory.dmp

      Filesize

      8KB

    • memory/5096-5-0x0000000002830000-0x0000000002840000-memory.dmp

      Filesize

      64KB

    • memory/5096-21-0x000000001B530000-0x000000001B53C000-memory.dmp

      Filesize

      48KB

    • memory/5096-19-0x000000001B510000-0x000000001B518000-memory.dmp

      Filesize

      32KB

    • memory/5096-16-0x000000001B2D0000-0x000000001B2D8000-memory.dmp

      Filesize

      32KB

    • memory/5096-15-0x000000001B2C0000-0x000000001B2C8000-memory.dmp

      Filesize

      32KB

    • memory/5096-13-0x000000001B2A0000-0x000000001B2A8000-memory.dmp

      Filesize

      32KB

    • memory/5096-25-0x00007FFF703D0000-0x00007FFF70E91000-memory.dmp

      Filesize

      10.8MB

    • memory/5096-26-0x00007FFF703D0000-0x00007FFF70E91000-memory.dmp

      Filesize

      10.8MB

    • memory/5096-4-0x0000000002710000-0x0000000002718000-memory.dmp

      Filesize

      32KB

    • memory/5096-37-0x00007FFF703D0000-0x00007FFF70E91000-memory.dmp

      Filesize

      10.8MB

    • memory/5096-3-0x0000000002700000-0x0000000002708000-memory.dmp

      Filesize

      32KB

    • memory/5096-95-0x00007FFF703D3000-0x00007FFF703D5000-memory.dmp

      Filesize

      8KB

    • memory/5096-97-0x00007FFF703D0000-0x00007FFF70E91000-memory.dmp

      Filesize

      10.8MB

    • memory/5096-2-0x00007FFF703D0000-0x00007FFF70E91000-memory.dmp

      Filesize

      10.8MB

    • memory/5096-1-0x00000000005E0000-0x00000000006AA000-memory.dmp

      Filesize

      808KB