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Analysis

  • max time kernel
    84s
  • max time network
    128s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230703-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/07/2023, 13:43

General

  • Target

    bc77f8df8e1dcb58a4142ee74.exe

  • Size

    828KB

  • MD5

    bc77f8df8e1dcb58a4142ee740803de9

  • SHA1

    c33ffa160a2d945b5c20dd0662a39ef666135e4c

  • SHA256

    ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e

  • SHA512

    e10cb92868bad8309a22b81fa421f8e8d90547800d64d594a2255238371c65c9a39ad8762960c9c4a9c85cab3db0551cd3893b62fe9bdcc0dbcd5d8b724447f5

  • SSDEEP

    12288:YnpgQaO+4y7PlLKnE2MoY0lHUkdiKLExUbtZ2jt7:WWQaO+42PlLKnEXoY0lViKYxIMp7

Score
10/10

Malware Config

Signatures

  • DcRat

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

  • Process spawned unexpected child process 9 IoCs

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

  • DCRat payload 3 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
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 9 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 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\bc77f8df8e1dcb58a4142ee74.exe
    "C:\Users\Admin\AppData\Local\Temp\bc77f8df8e1dcb58a4142ee74.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4304
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Y8nE0hKGnf.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4876
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:3188
        • C:\Windows\es-ES\RuntimeBroker.exe
          "C:\Windows\es-ES\RuntimeBroker.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:956
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1776
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4704
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2304
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Windows\es-ES\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4384
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\es-ES\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4424
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Windows\es-ES\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4932
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Users\Public\Documents\My Music\wininit.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2528
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Public\Documents\My Music\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1680
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Documents\My Music\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4184

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\Y8nE0hKGnf.bat

      Filesize

      199B

      MD5

      6cb45317d1cd8135887a31c601a5e0d6

      SHA1

      45b9c1216b40ee6e3da6d7408c188636aef296a9

      SHA256

      f271bd847bfc64a5a8f4b2aae7576e225b81c61aa27ba8a9b2b05d38d2e7ce93

      SHA512

      0b8721a103063e2ffd4abc6a368f58b345daa9bd291f94dc370d194b72b68796a734fb0321a553ecf568309bec377887c68f4ad90df32ee5188cd94f2c7759fa

    • C:\Windows\es-ES\RuntimeBroker.exe

      Filesize

      828KB

      MD5

      bc77f8df8e1dcb58a4142ee740803de9

      SHA1

      c33ffa160a2d945b5c20dd0662a39ef666135e4c

      SHA256

      ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e

      SHA512

      e10cb92868bad8309a22b81fa421f8e8d90547800d64d594a2255238371c65c9a39ad8762960c9c4a9c85cab3db0551cd3893b62fe9bdcc0dbcd5d8b724447f5

    • C:\Windows\es-ES\RuntimeBroker.exe

      Filesize

      828KB

      MD5

      bc77f8df8e1dcb58a4142ee740803de9

      SHA1

      c33ffa160a2d945b5c20dd0662a39ef666135e4c

      SHA256

      ae3aa6d645818c7b732fa7a70ad6bbd9b48be4f2a46ab60a9fc2169b6c8c141e

      SHA512

      e10cb92868bad8309a22b81fa421f8e8d90547800d64d594a2255238371c65c9a39ad8762960c9c4a9c85cab3db0551cd3893b62fe9bdcc0dbcd5d8b724447f5

    • memory/4304-133-0x0000000000210000-0x00000000002E6000-memory.dmp

      Filesize

      856KB

    • memory/4304-134-0x0000000000990000-0x00000000009A0000-memory.dmp

      Filesize

      64KB