Analysis

  • max time kernel
    94s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-11-2024 02:22

General

  • Target

    4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609.exe

  • Size

    1.9MB

  • MD5

    4cc23344d26c44260cb52028cff992b7

  • SHA1

    7f2b7a02ae3f65c6757f134a79c302a92e31311c

  • SHA256

    4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609

  • SHA512

    71e7ced9568ede15e9a9fe6edbd7ed77559f9046e8fc77ce83bb3fd464c61794ba719451774b2c02f30abc80a51f3563a1491a74d7f390d8152cd0b3b2928c45

  • SSDEEP

    49152:UbA30IKxSrOw6FNapB0LFyYsyqX96ZU8jMWg3:UberOGpaMYducjM3

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 15 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Disables Task Manager via registry modification
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 1 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 15 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs
  • System policy modification 1 TTPs 6 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\4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609.exe
    "C:\Users\Admin\AppData\Local\Temp\4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:932
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\BrowserreviewSavesruntimeperf\cyoW9TDLPAWUwl12Pv6zflv.vbe"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:620
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\BrowserreviewSavesruntimeperf\4COnkcqgLamz7kP5YHD7l4vjV.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1976
        • C:\BrowserreviewSavesruntimeperf\Blockreview.exe
          "C:\BrowserreviewSavesruntimeperf\Blockreview.exe"
          4⤵
          • UAC bypass
          • Checks computer location settings
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • System policy modification
          PID:4656
          • C:\Users\Admin\Contacts\sppsvc.exe
            "C:\Users\Admin\Contacts\sppsvc.exe"
            5⤵
            • UAC bypass
            • Executes dropped EXE
            • Checks whether UAC is enabled
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • System policy modification
            PID:3084
        • C:\Windows\SysWOW64\reg.exe
          reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
          4⤵
          • System Location Discovery: System Language Discovery
          • Modifies registry key
          PID:2816
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\BrowserreviewSavesruntimeperf\file.vbs"
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3656
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\updates\308046B0AF4A39CB\spoolsv.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3296
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Users\All Users\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\updates\308046B0AF4A39CB\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4000
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\Mozilla-1de4eec8-1241-4177-a864-e594e8d1fb38\updates\308046B0AF4A39CB\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3228
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 14 /tr "'C:\Users\Admin\Contacts\sppsvc.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1564
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\Admin\Contacts\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2940
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:\Users\Admin\Contacts\sppsvc.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3708
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Windows\fr-FR\dllhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3352
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\fr-FR\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1840
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Windows\fr-FR\dllhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3612
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\ssh\taskhostw.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2632
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Users\All Users\ssh\taskhostw.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3204
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 10 /tr "'C:\Users\All Users\ssh\taskhostw.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4012
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Program Files\Java\jre-1.8\legal\jdk\lsass.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2020
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files\Java\jre-1.8\legal\jdk\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2432
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 7 /tr "'C:\Program Files\Java\jre-1.8\legal\jdk\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2680

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\BrowserreviewSavesruntimeperf\4COnkcqgLamz7kP5YHD7l4vjV.bat

    Filesize

    162B

    MD5

    30ca6fe561a5efd9a1f56bbb4cfd2ec0

    SHA1

    8c6d786d854487eb43f2ba5c48f739ad565b398e

    SHA256

    d749a9500abf1e22af57ef9bc10b7e30f599067dffb7152e03c67eb70a1f6e2b

    SHA512

    85ff52e77cd3e6c2e329d4b921905865484c62dcb8d53ba97d8e04972e78934648b2fe51890ff949436a2afbabbe74c4e65e1d28a51cdcb2620429c7f481018a

  • C:\BrowserreviewSavesruntimeperf\Blockreview.exe

    Filesize

    1.6MB

    MD5

    3298254972dfd7e76172f9d3a7675b27

    SHA1

    569946a908e6a9cfa0a3faa28996d886b749e4eb

    SHA256

    719c6747522525b61a364a3d62e5777c9f8715dc8654bfd082e7928e4db39188

    SHA512

    8200af5528dcc1f4b6eddb13540f03ba9d142fc6ef779c94ca1d59fbcb2ed3021638c7b6cc7f865c75c8dd3fe8ef652291b91c9044f3c6b9e57f9fad1c99271d

  • C:\BrowserreviewSavesruntimeperf\cyoW9TDLPAWUwl12Pv6zflv.vbe

    Filesize

    231B

    MD5

    01218abf206810b6e271415d154b23f4

    SHA1

    4ca645974bcd3f9baaf6dbf9073e82717494e7fe

    SHA256

    5631e2c439fe88993fc8a5ace15a447afc23c6f9412fa5e48fc78e96aa14699b

    SHA512

    caebaa06e1236fe479b49860a57e065ff70ce876b86fe254bac8912c1f1b2be5022a21c59b45148cfa2b8388c0f4f22655ebd36fb13df1221443de3bacce48d8

  • C:\BrowserreviewSavesruntimeperf\file.vbs

    Filesize

    34B

    MD5

    677cc4360477c72cb0ce00406a949c61

    SHA1

    b679e8c3427f6c5fc47c8ac46cd0e56c9424de05

    SHA256

    f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b

    SHA512

    7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a

  • memory/3084-53-0x00000000027E0000-0x00000000027F2000-memory.dmp

    Filesize

    72KB

  • memory/4656-22-0x0000000002660000-0x0000000002676000-memory.dmp

    Filesize

    88KB

  • memory/4656-25-0x000000001BA90000-0x000000001BAA2000-memory.dmp

    Filesize

    72KB

  • memory/4656-20-0x000000001B890000-0x000000001B8E0000-memory.dmp

    Filesize

    320KB

  • memory/4656-21-0x0000000002650000-0x0000000002658000-memory.dmp

    Filesize

    32KB

  • memory/4656-23-0x0000000002680000-0x000000000268A000-memory.dmp

    Filesize

    40KB

  • memory/4656-18-0x0000000002620000-0x000000000262E000-memory.dmp

    Filesize

    56KB

  • memory/4656-24-0x0000000002690000-0x000000000269C000-memory.dmp

    Filesize

    48KB

  • memory/4656-19-0x0000000002630000-0x000000000264C000-memory.dmp

    Filesize

    112KB

  • memory/4656-26-0x000000001BFF0000-0x000000001C518000-memory.dmp

    Filesize

    5.2MB

  • memory/4656-27-0x000000001BAC0000-0x000000001BACC000-memory.dmp

    Filesize

    48KB

  • memory/4656-28-0x000000001BAD0000-0x000000001BAD8000-memory.dmp

    Filesize

    32KB

  • memory/4656-29-0x000000001BAE0000-0x000000001BAEE000-memory.dmp

    Filesize

    56KB

  • memory/4656-30-0x000000001BAF0000-0x000000001BAFE000-memory.dmp

    Filesize

    56KB

  • memory/4656-31-0x000000001BB10000-0x000000001BB1C000-memory.dmp

    Filesize

    48KB

  • memory/4656-17-0x0000000000460000-0x0000000000600000-memory.dmp

    Filesize

    1.6MB