Analysis

  • max time kernel
    121s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    11-12-2024 19:46

General

  • Target

    8B744166EECACE320158F4D0F704B13E.exe

  • Size

    2.7MB

  • MD5

    8b744166eecace320158f4d0f704b13e

  • SHA1

    b92636084b3bd914514bc44556c4803933d667a3

  • SHA256

    aa7a05956ca47e164a10a94d0bdbe01123b84eb01fad5e581e1e72b10d93d5a9

  • SHA512

    641b3065e30186ccf9ba84ce6d345565763bbdb5fc1b1201c3f08fce5466c2384250b85b4c0220d2b9e21c5a51ff5ef60e9b910e07107e2b7e06f97b4e429d27

  • SSDEEP

    24576:l+O4GuNVHU+AH2FWxOYIOlIZBrlsQBYI63DSyve5fG:s3N5IO6OtsMYIxS

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 3 IoCs
  • Process spawned unexpected child process 3 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Drops file in System32 directory 5 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 13 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\8B744166EECACE320158F4D0F704B13E.exe
    "C:\Users\Admin\AppData\Local\Temp\8B744166EECACE320158F4D0F704B13E.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2420
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\pktyTdDoNP.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2840
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2760
        • C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe
          "C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2816
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\ROUTE\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2228
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2132
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\msvcp140\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2980

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe

      Filesize

      2.7MB

      MD5

      8b744166eecace320158f4d0f704b13e

      SHA1

      b92636084b3bd914514bc44556c4803933d667a3

      SHA256

      aa7a05956ca47e164a10a94d0bdbe01123b84eb01fad5e581e1e72b10d93d5a9

      SHA512

      641b3065e30186ccf9ba84ce6d345565763bbdb5fc1b1201c3f08fce5466c2384250b85b4c0220d2b9e21c5a51ff5ef60e9b910e07107e2b7e06f97b4e429d27

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

      Filesize

      261B

      MD5

      9221382b38206256e6c0543f63d46e1c

      SHA1

      698bb30d740fe0926fb2e6cc10c18f9c28fb6905

      SHA256

      50d8629a95b98b83b2d53ebae6ca25b72189e084401a5cbe554d5b3e77044cfc

      SHA512

      a6e6df3da0737b946b6d55476f5b5e4aa3da35249f932715785932e6a6c5e0f46e298298ed1899ddf61d975081f49ce7d830f4d066767b17fbfd10b86764a0f0

    • memory/2420-0-0x000007FEF5F13000-0x000007FEF5F14000-memory.dmp

      Filesize

      4KB

    • memory/2420-1-0x0000000000E70000-0x000000000111E000-memory.dmp

      Filesize

      2.7MB

    • memory/2420-2-0x000007FEF5F10000-0x000007FEF68FC000-memory.dmp

      Filesize

      9.9MB

    • memory/2420-13-0x000007FEF5F10000-0x000007FEF68FC000-memory.dmp

      Filesize

      9.9MB

    • memory/2816-17-0x0000000001330000-0x00000000015DE000-memory.dmp

      Filesize

      2.7MB

    • memory/2816-18-0x00000000003D0000-0x00000000003DC000-memory.dmp

      Filesize

      48KB

    • memory/2816-19-0x00000000003E0000-0x00000000003EC000-memory.dmp

      Filesize

      48KB

    • memory/2816-20-0x0000000001180000-0x000000000118C000-memory.dmp

      Filesize

      48KB

    • memory/2816-21-0x00000000012F0000-0x00000000012F8000-memory.dmp

      Filesize

      32KB

    • memory/2816-22-0x00000000003F0000-0x00000000003FA000-memory.dmp

      Filesize

      40KB