Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    01-12-2024 18:56

General

  • Target

    MsSavesSessionDll/agentreviewPerf.exe

  • Size

    2.3MB

  • MD5

    4e69fcf73418a08fcb8b3e7e2ecb43c4

  • SHA1

    a3ecd09f65ca4e7821a0b7f8596edcd679573f5b

  • SHA256

    fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4

  • SHA512

    a6d1a2b6363ad8a560567e6c11a48f8d1bc4cdfc36474902edf39f676440be82619aae52279121a776486d0edfe7a448f0fe9707b27ae760c1d6dd0201f6adc3

  • SSDEEP

    49152:BwpUwcTZ0rUinysyVZl5LCCcG3RTXM34FIIPWYJxuQfUgtFneJ8BG5U:Bw1ctUyjTLC8puaX/neJ8BgU

Malware Config

Signatures

  • DcRat 20 IoCs

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

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
  • Process spawned unexpected child process 18 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.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 12 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 2 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\MsSavesSessionDll\agentreviewPerf.exe
    "C:\Users\Admin\AppData\Local\Temp\MsSavesSessionDll\agentreviewPerf.exe"
    1⤵
    • DcRat
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2748
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\sdnzbYHJb4.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1052
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:3056
        • C:\Windows\ServiceProfiles\System.exe
          "C:\Windows\ServiceProfiles\System.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 12 /tr "'C:\Windows\ServiceProfiles\System.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2604
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\ServiceProfiles\System.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2612
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Windows\ServiceProfiles\System.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2552
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 8 /tr "'C:\Users\Default\OSPPSVC.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2676
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Users\Default\OSPPSVC.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3040
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 11 /tr "'C:\Users\Default\OSPPSVC.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1220
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 13 /tr "'C:\Program Files\Common Files\System\ja-JP\WmiPrvSE.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:604
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Common Files\System\ja-JP\WmiPrvSE.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:276
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 8 /tr "'C:\Program Files\Common Files\System\ja-JP\WmiPrvSE.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1432
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 7 /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\winlogon.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2596
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2652
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2056
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 13 /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\audiodg.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2512
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:560
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 11 /tr "'C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\audiodg.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1888
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 11 /tr "'C:\Program Files\VideoLAN\VLC\winlogon.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2852
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\VLC\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2892
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Program Files\VideoLAN\VLC\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2308

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Recovery\1f4ba082-69f6-11ef-a143-62cb582c238c\audiodg.exe

      Filesize

      2.3MB

      MD5

      4e69fcf73418a08fcb8b3e7e2ecb43c4

      SHA1

      a3ecd09f65ca4e7821a0b7f8596edcd679573f5b

      SHA256

      fa78ac8f4c94923c7e53a3bf6936b46aff02f7746ee9518460c2d529ea2982d4

      SHA512

      a6d1a2b6363ad8a560567e6c11a48f8d1bc4cdfc36474902edf39f676440be82619aae52279121a776486d0edfe7a448f0fe9707b27ae760c1d6dd0201f6adc3

    • C:\Users\Admin\AppData\Local\Temp\sdnzbYHJb4.bat

      Filesize

      202B

      MD5

      36277f8913831ae74b72ce48cef20a45

      SHA1

      9f201c71147a33b3dc95e80b00c5917a6a557d78

      SHA256

      bd726e62f929f416b2d055dd741148779ea144059ee34cc88e78616d296b603a

      SHA512

      ac73903f111ec870224553deb3eccde3cf298e9e6b6e7e2058285a9383f2a83636c8b99be51335880a52ec7c28add29efb84a3d10e5b556f8c455a3f4bda3bfd

    • memory/1872-32-0x0000000000D50000-0x0000000000DA6000-memory.dmp

      Filesize

      344KB

    • memory/1872-31-0x0000000000FF0000-0x0000000001242000-memory.dmp

      Filesize

      2.3MB

    • memory/2748-6-0x0000000000AC0000-0x0000000000AD2000-memory.dmp

      Filesize

      72KB

    • memory/2748-5-0x0000000000DE0000-0x0000000000E36000-memory.dmp

      Filesize

      344KB

    • memory/2748-0-0x000007FEF6033000-0x000007FEF6034000-memory.dmp

      Filesize

      4KB

    • memory/2748-7-0x0000000000AD0000-0x0000000000ADE000-memory.dmp

      Filesize

      56KB

    • memory/2748-8-0x000000001ACE0000-0x000000001ACE8000-memory.dmp

      Filesize

      32KB

    • memory/2748-9-0x000000001ACF0000-0x000000001ACF8000-memory.dmp

      Filesize

      32KB

    • memory/2748-4-0x0000000000AA0000-0x0000000000AB6000-memory.dmp

      Filesize

      88KB

    • memory/2748-27-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

      Filesize

      9.9MB

    • memory/2748-3-0x0000000000A80000-0x0000000000A9C000-memory.dmp

      Filesize

      112KB

    • memory/2748-2-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

      Filesize

      9.9MB

    • memory/2748-1-0x0000000000E30000-0x0000000001082000-memory.dmp

      Filesize

      2.3MB