Analysis

  • max time kernel
    118s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20240705-en
  • resource tags

    arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
  • submitted
    21-07-2024 10:23

General

  • Target

    fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe

  • Size

    827KB

  • MD5

    ac9e1c7decb45fa41c77e30543bc535e

  • SHA1

    b89c25859b9b195d8768868be6d4b029bd395d1f

  • SHA256

    fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682

  • SHA512

    32ad2b8385fbb5206be47bd55f8a3af55ce6fd84c48771fec8b7fc39862fb9133aaf99de5672a548454c17fd05a03a0f3c1813df65b65fdae73ca7881393c417

  • SSDEEP

    12288:aRX/Vbdw0amUjO3t/6jf0eEHP2a1KP/CpvwfpKdXRJNJa:kXVamd96jf0/2apvwxKdXRJNJa

Malware Config

Signatures

  • DcRat 29 IoCs

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

  • Modifies WinLogon for persistence 2 TTPs 9 IoCs
  • Process spawned unexpected child process 27 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 18 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 9 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 27 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 3 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\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe
    "C:\Users\Admin\AppData\Local\Temp\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.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:3036
    • C:\Windows\TAPI\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe
      "C:\Windows\TAPI\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2064
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\Windows\system\lsass.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1068
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\system\lsass.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2024
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 5 /tr "'C:\Windows\system\lsass.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2632
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\taskhost.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2104
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\taskhost.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2116
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\taskhost.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2640
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Windows\de-DE\csrss.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2760
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\de-DE\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2708
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 8 /tr "'C:\Windows\de-DE\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2588
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Microsoft Visual Studio 8\SDK\System.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2844
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Visual Studio 8\SDK\System.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2456
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Microsoft Visual Studio 8\SDK\System.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2548
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 9 /tr "'C:\Program Files\DVD Maker\OSPPSVC.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2712
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\DVD Maker\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2452
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 5 /tr "'C:\Program Files\DVD Maker\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2584
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\smss.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1564
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\smss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3048
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 9 /tr "'C:\MSOCache\All Users\{90140000-0016-0409-0000-0000000FF1CE}-C\smss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2656
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 12 /tr "'C:\Users\Public\Pictures\Sample Pictures\audiodg.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2792
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Users\Public\Pictures\Sample Pictures\audiodg.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2784
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Pictures\Sample Pictures\audiodg.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2812
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682f" /sc MINUTE /mo 13 /tr "'C:\Windows\TAPI\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2892
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682" /sc ONLOGON /tr "'C:\Windows\TAPI\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2704
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682f" /sc MINUTE /mo 10 /tr "'C:\Windows\TAPI\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2772
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682f" /sc MINUTE /mo 7 /tr "'C:\Windows\Help\Windows\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1856
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682" /sc ONLOGON /tr "'C:\Windows\Help\Windows\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1868
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682f" /sc MINUTE /mo 5 /tr "'C:\Windows\Help\Windows\fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1236

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Program Files\DVD Maker\OSPPSVC.exe

    Filesize

    827KB

    MD5

    ac9e1c7decb45fa41c77e30543bc535e

    SHA1

    b89c25859b9b195d8768868be6d4b029bd395d1f

    SHA256

    fa39dd1b81fd531008083264294a6acddc409035850619c966f5bcb4c16cc682

    SHA512

    32ad2b8385fbb5206be47bd55f8a3af55ce6fd84c48771fec8b7fc39862fb9133aaf99de5672a548454c17fd05a03a0f3c1813df65b65fdae73ca7881393c417

  • memory/2064-28-0x0000000000F90000-0x0000000001066000-memory.dmp

    Filesize

    856KB

  • memory/3036-0-0x000007FEF5B83000-0x000007FEF5B84000-memory.dmp

    Filesize

    4KB

  • memory/3036-1-0x00000000003B0000-0x0000000000486000-memory.dmp

    Filesize

    856KB

  • memory/3036-2-0x000007FEF5B80000-0x000007FEF656C000-memory.dmp

    Filesize

    9.9MB

  • memory/3036-27-0x000007FEF5B80000-0x000007FEF656C000-memory.dmp

    Filesize

    9.9MB