Analysis

  • max time kernel
    121s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    22/03/2025, 20:31

General

  • Target
    85edcd8fbc445760ff0796aa459e3c42.exe
  • Size 999KB
  • Sample250322-zaqppszvbx
  • SHA256 8b7f417cdbc071fe2752a6c225154b943636ebd63674d591861251f5bdaaa292
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat 46 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 11 IoCs
  • Process spawned unexpected child process 44 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 10 IoCs
  • Drops file in Program Files directory 15 IoCs
  • Drops file in Windows directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 44 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 1 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\85edcd8fbc445760ff0796aa459e3c42.exe
    "C:\Users\Admin\AppData\Local\Temp\85edcd8fbc445760ff0796aa459e3c42.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:1764
    • C:\Program Files\Windows Journal\es-ES\csrss.exe
      "C:\Program Files\Windows Journal\es-ES\csrss.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:2052
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Journal\es-ES\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2800
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Journal\es-ES\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2696
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONSTART /tr "'C:\Program Files\Windows Journal\es-ES\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2668
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows Journal\es-ES\csrss.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2820
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVC" /sc MINUTE /mo 11 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2724
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2968
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVC" /sc ONSTART /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\OSPPSVC.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2756
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 11 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\OSPPSVC.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2816
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\csrss.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 "csrss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2324
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONSTART /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\csrss.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3008
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\csrss.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2336
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc MINUTE /mo 7 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1684
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1900
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc ONSTART /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:344
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorere" /sc MINUTE /mo 5 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\explorer.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2272
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc MINUTE /mo 8 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2060
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1088
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc ONSTART /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:304
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 8 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1612
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc MINUTE /mo 6 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2280
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.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 "winlogon" /sc ONSTART /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2912
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 9 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:768
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc MINUTE /mo 11 /tr "'C:\Windows\Vss\Writers\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2400
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\Vss\Writers\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2204
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONSTART /tr "'C:\Windows\Vss\Writers\lsm.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2144
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 5 /tr "'C:\Windows\Vss\Writers\lsm.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2076
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Start Menu\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2880
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\All Users\Start Menu\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1808
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogon" /sc ONSTART /tr "'C:\Users\All Users\Start Menu\winlogon.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2092
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Start Menu\winlogon.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:448
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Idle" /sc MINUTE /mo 13 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\Idle.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2804
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\Idle.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2520
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Idle" /sc ONSTART /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\Idle.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 "IdleI" /sc MINUTE /mo 11 /tr "'C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\Idle.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1368
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininit" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Adobe\Reader 9.0\wininit.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:544
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Reader 9.0\wininit.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2980
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininit" /sc ONSTART /tr "'C:\Program Files (x86)\Adobe\Reader 9.0\wininit.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1904
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Adobe\Reader 9.0\wininit.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1160
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WMIADAP" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft Office\Office14\WMIADAP.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3032
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WMIADAP" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Office\Office14\WMIADAP.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1740
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WMIADAP" /sc ONSTART /tr "'C:\Program Files (x86)\Microsoft Office\Office14\WMIADAP.exe'" /rl HIGHEST /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1384
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WMIADAPW" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft Office\Office14\WMIADAP.exe'" /f
    1⤵
    • DcRat
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:624

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        csrss.exe

        • Path C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\csrss.exe
        • Size 999KB
        • SHA256 bddd6d8bf6982f1c6d31b8b630058ea4bcc395b13b55e98fec61146737c37306
        • MD5 SHA1 SHA512 SSDEEP

        WMIADAP.exe

        • Path C:\Program Files (x86)\Microsoft Office\Office14\WMIADAP.exe
        • Size 999KB
        • SHA256 669c96488ef8730dd85483c06474fe08efe3d58f11841183259bd499d1aba84d
        • MD5 SHA1 SHA512 SSDEEP

        RCX2FE.tmp

        • Path C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\RCX2FE.tmp
        • Size 999KB
        • SHA256 0061f91a2462e8c674aadedabd7dc6e4a46c32c333b7899c1f4a735f623d1310
        • MD5 SHA1 SHA512 SSDEEP

        winlogon.exe

        • Path C:\Recovery\1a287102-69f6-11ef-b2ff-62cb582c238c\winlogon.exe
        • Size 999KB
        • SHA256 8b7f417cdbc071fe2752a6c225154b943636ebd63674d591861251f5bdaaa292
        • MD5 SHA1 SHA512 SSDEEP

        memory/1764-4-0x00000000002E0000-0x00000000002F0000-memory.dmp

        memory/1764-5-0x00000000002F0000-0x0000000000300000-memory.dmp

        memory/1764-6-0x0000000000300000-0x0000000000310000-memory.dmp

        memory/1764-7-0x0000000000310000-0x000000000031C000-memory.dmp

        memory/1764-8-0x0000000000520000-0x000000000052E000-memory.dmp

        memory/1764-9-0x0000000000530000-0x000000000053C000-memory.dmp

        memory/1764-10-0x0000000000540000-0x000000000054C000-memory.dmp

        memory/1764-0-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

        memory/1764-3-0x00000000001C0000-0x00000000001DC000-memory.dmp

        memory/1764-2-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

        memory/1764-1-0x00000000001E0000-0x00000000002E0000-memory.dmp

        memory/1764-163-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

        memory/2052-162-0x0000000000BE0000-0x0000000000CE0000-memory.dmp