Overview

overview

10

Static

static

3

OverwackLoader.exe

windows10-2004-x64

10

OverwackLoader.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    123s
  • max time network
    145s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260617-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260617-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    26/06/2026, 22:32

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General

  • Target
    OverwackLoader.exe
  • Size 361KB
  • Sample260626-2fynlsfy7k
  • SHA256 b10b7e309499e040cdd1430ae96c64bd7ae14b863587c4533ba9d802e88a3608
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwareaspackv2backdoordiscoverybdaejecpersistenceransomwarespyware

Malware Config

Extracted

Family

  • bdaejec

C2

  • ddos.dnsnb8.net

Signatures

  • Family: Bdaejec

    Bdaejec is a backdoor written in C++.

    backdoorbdaejec
  • Detects Bdaejec Backdoor. 1 IoCs

    Bdaejec is backdoor written in C++.

  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Downloads MZ/PE file 1 IoCs
  • ASPack v2.12-2.42 1 IoCs

    Detects executables packed with ASPack v2.12-2.42

    aspackv2
  • Executes dropped EXE 1 IoCs
  • Enumerates connected drives 3 TTPs 2 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 64 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

    discovery
  • Checks SCSI registry key(s) 3 TTPs 62 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
    adwarespyware
  • Modifies registry class 38 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 28 IoCs
  • Suspicious use of FindShellTrayWindow 54 IoCs
  • Suspicious use of SendNotifyMessage 43 IoCs
  • Suspicious use of SetWindowsHookEx 3 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.

    persistence
  • Uses Volume Shadow Copy WMI provider

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\OverwackLoader.exe
    "C:\Users\Admin\AppData\Local\Temp\OverwackLoader.exe"
    1⤵
    • Downloads MZ/PE file
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2808
    • C:\Users\Admin\AppData\Local\Temp\RPlZdn.exe
      C:\Users\Admin\AppData\Local\Temp\RPlZdn.exe
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • System Location Discovery: System Language Discovery
      PID:4512
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\55417ebd.bat" "
        3⤵
          PID:5724
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c pause
        2⤵
        • System Location Discovery: System Language Discovery
        PID:704
    • C:\Windows\system32\sihost.exe
      sihost.exe
      1⤵
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:5660
      • C:\Windows\explorer.exe
        explorer.exe /LOADSAVEDWINDOWS
        2⤵
        • Boot or Logon Autostart Execution: Active Setup
        • Enumerates connected drives
        • Checks SCSI registry key(s)
        • Modifies Internet Explorer settings
        • Modifies registry class
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of SetWindowsHookEx
        PID:4792
    • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
      "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:1580
    • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
      "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:5276

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          k2[1].rar
          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\K167TKID\k2[1].rar
          • Size 1B
          • SHA256 01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b
          • MD5 SHA1 SHA512
          Submit Download

          prep_Activatable Class_Hermes_perf.cache
          • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
          • Size 599B
          • SHA256 b536a3dae9ea5c69081f0491eed829e3b57e32401fdf49a63031bcd6b20e6fdb
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          09DF3387.exe
          • Path C:\Users\Admin\AppData\Local\Temp\09DF3387.exe
          • Size 1B
          • SHA256 08f271887ce94707da822d5263bae19d5519cb3614e0daedc4c7ce5dab7473f1
          • MD5 SHA1 SHA512
          Submit Download

          55417ebd.bat
          • Path C:\Users\Admin\AppData\Local\Temp\55417ebd.bat
          • Size 187B
          • SHA256 fa18cd7cfb79c06eaedc298e2a454246b1c9a9fcb97d2d77fc3bfb022b2526e1
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          RPlZdn.exe
          • Path C:\Users\Admin\AppData\Local\Temp\RPlZdn.exe
          • Size 15KB
          • SHA256 4354970ccc7cd6bb16318f132c34f6a1b3d5c2ea7ff53e1c9271905527f2db07
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/1580-95-0x000001DB14260000-0x000001DB14280000-memory.dmp
          Download

          memory/1580-49-0x000001DB001E0000-0x000001DB002E0000-memory.dmp
          Download

          memory/1580-61-0x000001DB02A00000-0x000001DB02A20000-memory.dmp
          Download

          memory/1580-73-0x000001DB02DE0000-0x000001DB02E00000-memory.dmp
          Download

          memory/1580-62-0x000001DB02E40000-0x000001DB02F40000-memory.dmp
          Download

          memory/2808-0-0x0000000000C30000-0x0000000000C8F000-memory.dmp
          Download

          memory/2808-42-0x0000000000C30000-0x0000000000C8F000-memory.dmp
          Download

          memory/4512-43-0x00000000008F0000-0x00000000008F9000-memory.dmp
          Download

          memory/4512-5-0x00000000008F0000-0x00000000008F9000-memory.dmp
          Download

          memory/4792-234-0x000000000EE10000-0x000000000F68B000-memory.dmp
          Download