Analysis

  • max time kernel
    93s
  • max time network
    95s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-01-2025 01:39

General

  • Target

    40ff13f7d3616f322000142cda7b432b45ea18df020c0dcfc1455202d67ad0ad.exe

  • Size

    783KB

  • MD5

    284f614242b459699b4f93b34bcea38a

  • SHA1

    496d71d236c11b794dd355f3e76614c839971d42

  • SHA256

    40ff13f7d3616f322000142cda7b432b45ea18df020c0dcfc1455202d67ad0ad

  • SHA512

    398d9ade2bc0a108906784b85160396feed4a80586ac47d70db1079f7dfbdb728debf687164d36db9014a2c2cf1f47be33faa6c33644a3c44ec6f05c4ead74df

  • SSDEEP

    12288:mqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqKt:m+OQbpbgsFdAyQvzSqaq8q8

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 10 IoCs

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

  • UAC bypass 3 TTPs 3 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 10 IoCs
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Drops file in System32 directory 8 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Drops file in Windows directory 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 10 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 21 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs
  • System policy modification 1 TTPs 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\40ff13f7d3616f322000142cda7b432b45ea18df020c0dcfc1455202d67ad0ad.exe
    "C:\Users\Admin\AppData\Local\Temp\40ff13f7d3616f322000142cda7b432b45ea18df020c0dcfc1455202d67ad0ad.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1016
    • C:\Recovery\WindowsRE\RuntimeBroker.exe
      "C:\Recovery\WindowsRE\RuntimeBroker.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1664
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\system\explorer.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3092
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Documents and Settings\taskhostw.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1708
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Update\1.3.36.371\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1744
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\ACPBackgroundManagerPolicy\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:388
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:212
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3276
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\ProgramData\WindowsHolographicDevices\SpatialStore\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2016
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\DefaultSettings\SearchApp.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3472
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\PerfLogs\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1228
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\bisrv\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3948

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Recovery\WindowsRE\Idle.exe

    Filesize

    783KB

    MD5

    284f614242b459699b4f93b34bcea38a

    SHA1

    496d71d236c11b794dd355f3e76614c839971d42

    SHA256

    40ff13f7d3616f322000142cda7b432b45ea18df020c0dcfc1455202d67ad0ad

    SHA512

    398d9ade2bc0a108906784b85160396feed4a80586ac47d70db1079f7dfbdb728debf687164d36db9014a2c2cf1f47be33faa6c33644a3c44ec6f05c4ead74df

  • memory/1016-14-0x0000000000DE0000-0x0000000000DE8000-memory.dmp

    Filesize

    32KB

  • memory/1016-7-0x0000000000D60000-0x0000000000D6C000-memory.dmp

    Filesize

    48KB

  • memory/1016-17-0x00000000025E0000-0x00000000025E8000-memory.dmp

    Filesize

    32KB

  • memory/1016-6-0x0000000000D80000-0x0000000000D88000-memory.dmp

    Filesize

    32KB

  • memory/1016-16-0x00000000025D0000-0x00000000025D8000-memory.dmp

    Filesize

    32KB

  • memory/1016-8-0x0000000000D90000-0x0000000000D9A000-memory.dmp

    Filesize

    40KB

  • memory/1016-9-0x0000000000DB0000-0x0000000000DBA000-memory.dmp

    Filesize

    40KB

  • memory/1016-4-0x0000000000D40000-0x0000000000D48000-memory.dmp

    Filesize

    32KB

  • memory/1016-3-0x0000000000D30000-0x0000000000D38000-memory.dmp

    Filesize

    32KB

  • memory/1016-10-0x0000000000DA0000-0x0000000000DA8000-memory.dmp

    Filesize

    32KB

  • memory/1016-11-0x0000000000DC0000-0x0000000000DC8000-memory.dmp

    Filesize

    32KB

  • memory/1016-15-0x00000000025C0000-0x00000000025C8000-memory.dmp

    Filesize

    32KB

  • memory/1016-13-0x00000000025B0000-0x00000000025B8000-memory.dmp

    Filesize

    32KB

  • memory/1016-0-0x00007FFF612E3000-0x00007FFF612E5000-memory.dmp

    Filesize

    8KB

  • memory/1016-5-0x0000000000D50000-0x0000000000D60000-memory.dmp

    Filesize

    64KB

  • memory/1016-2-0x00007FFF612E0000-0x00007FFF61DA1000-memory.dmp

    Filesize

    10.8MB

  • memory/1016-12-0x0000000000DF0000-0x0000000000DF8000-memory.dmp

    Filesize

    32KB

  • memory/1016-18-0x00000000025F0000-0x00000000025F8000-memory.dmp

    Filesize

    32KB

  • memory/1016-20-0x0000000002610000-0x0000000002618000-memory.dmp

    Filesize

    32KB

  • memory/1016-25-0x00007FFF612E0000-0x00007FFF61DA1000-memory.dmp

    Filesize

    10.8MB

  • memory/1016-22-0x000000001B150000-0x000000001B158000-memory.dmp

    Filesize

    32KB

  • memory/1016-21-0x0000000002660000-0x000000000266C000-memory.dmp

    Filesize

    48KB

  • memory/1016-19-0x0000000002600000-0x0000000002608000-memory.dmp

    Filesize

    32KB

  • memory/1016-28-0x00007FFF612E0000-0x00007FFF61DA1000-memory.dmp

    Filesize

    10.8MB

  • memory/1016-1-0x00000000003C0000-0x000000000048A000-memory.dmp

    Filesize

    808KB

  • memory/1016-37-0x00007FFF612E0000-0x00007FFF61DA1000-memory.dmp

    Filesize

    10.8MB

  • memory/1016-104-0x00007FFF612E3000-0x00007FFF612E5000-memory.dmp

    Filesize

    8KB

  • memory/1016-119-0x00007FFF612E0000-0x00007FFF61DA1000-memory.dmp

    Filesize

    10.8MB

  • memory/1016-180-0x00007FFF612E0000-0x00007FFF61DA1000-memory.dmp

    Filesize

    10.8MB