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Analysis

  • max time kernel
    117s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    12/12/2024, 02:37

General

  • Target

    aa7a05956ca47e164a10a94d0bdbe01123b84eb01fad5e581e1e72b10d93d5a9.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 7 IoCs
  • 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 14 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\aa7a05956ca47e164a10a94d0bdbe01123b84eb01fad5e581e1e72b10d93d5a9.exe
    "C:\Users\Admin\AppData\Local\Temp\aa7a05956ca47e164a10a94d0bdbe01123b84eb01fad5e581e1e72b10d93d5a9.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2412
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\oD6dgbayc4.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3056
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2864
        • C:\Windows\System32\msmmsp\taskhost.exe
          "C:\Windows\System32\msmmsp\taskhost.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2620
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\cmstplua\spoolsv.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 "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\msmmsp\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1632
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\iepeers\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2796

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\oD6dgbayc4.bat

      Filesize

      203B

      MD5

      926254c29871e0dc0a5eeefbce561a36

      SHA1

      cf6fdaf6d3ac7748e2d5eb4d038cf5e58951719f

      SHA256

      227988f05f0fbf5c496e60d9d60f23e95e77c50622e9ddd3bde13f80f3a8733e

      SHA512

      5a929d822dd8f7d7dceebcb41d5388351c5127df334c33fa6dd93d78ea410a45a0426108938d2eea06d2e1d960f15ab306c9d061047291d2bd5f58fd13013481

    • C:\Windows\System32\msmmsp\taskhost.exe

      Filesize

      2.7MB

      MD5

      8b744166eecace320158f4d0f704b13e

      SHA1

      b92636084b3bd914514bc44556c4803933d667a3

      SHA256

      aa7a05956ca47e164a10a94d0bdbe01123b84eb01fad5e581e1e72b10d93d5a9

      SHA512

      641b3065e30186ccf9ba84ce6d345565763bbdb5fc1b1201c3f08fce5466c2384250b85b4c0220d2b9e21c5a51ff5ef60e9b910e07107e2b7e06f97b4e429d27

    • memory/2412-0-0x000007FEF53B3000-0x000007FEF53B4000-memory.dmp

      Filesize

      4KB

    • memory/2412-1-0x0000000000F20000-0x00000000011CE000-memory.dmp

      Filesize

      2.7MB

    • memory/2412-2-0x000007FEF53B0000-0x000007FEF5D9C000-memory.dmp

      Filesize

      9.9MB

    • memory/2412-13-0x000007FEF53B0000-0x000007FEF5D9C000-memory.dmp

      Filesize

      9.9MB

    • memory/2620-17-0x0000000000D90000-0x000000000103E000-memory.dmp

      Filesize

      2.7MB

    • memory/2620-18-0x0000000000140000-0x000000000014C000-memory.dmp

      Filesize

      48KB

    • memory/2620-19-0x0000000000160000-0x000000000016C000-memory.dmp

      Filesize

      48KB

    • memory/2620-20-0x0000000000400000-0x000000000040C000-memory.dmp

      Filesize

      48KB

    • memory/2620-21-0x0000000000370000-0x0000000000378000-memory.dmp

      Filesize

      32KB

    • memory/2620-22-0x0000000000420000-0x000000000042A000-memory.dmp

      Filesize

      40KB