Analysis

  • max time kernel
    121s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    29-05-2024 07:08

General

  • Target

    00688ead526d7ae741450c176a3c9a0a24f4da5980c6c7c09b6088fbee205d7f.exe

  • Size

    1002KB

  • MD5

    6eb93471d34dce78877ebc870816238f

  • SHA1

    288796474024860cd052925518947e71da404aeb

  • SHA256

    00688ead526d7ae741450c176a3c9a0a24f4da5980c6c7c09b6088fbee205d7f

  • SHA512

    1e7e6dcddd3d799e1180a2e0edb37f61b170ffb2d6ccc32fc13057c0ce39aa379217c46749c390f63af727e5041a374b612753babdbdb8aaf893e51118ec3ea6

  • SSDEEP

    24576:eUBPDxG9OhoBEbxWx7wS1XKNPe3U+Emr:eU5NQqWxtKl6wg

Malware Config

Signatures

  • Avoslocker Ransomware

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

  • 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 (10383) 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.

  • Interacts with shadow copies 2 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\00688ead526d7ae741450c176a3c9a0a24f4da5980c6c7c09b6088fbee205d7f.exe
    "C:\Users\Admin\AppData\Local\Temp\00688ead526d7ae741450c176a3c9a0a24f4da5980c6c7c09b6088fbee205d7f.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Windows\system32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1788
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4080
    • C:\Windows\system32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1048
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:1324
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} recoveryenabled No
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1804
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} recoveryenabled No
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:4736
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1912
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:1044
    • C:\Windows\system32\cmd.exe
      cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1676
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4276
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "$a = [System.IO.File]::ReadAllText(\"Z:\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:4492
      • 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\2090100087.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:1948
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:4200
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4456

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\2090100087.png

      Filesize

      32KB

      MD5

      22a90a703f3150597c9be76ffafa5136

      SHA1

      bff44186563afeccda1406b17401de052c2a3366

      SHA256

      eab4c9e752548c3a53887993ae66891861a376210ee363e49b4bb29d97d91b7d

      SHA512

      8bf44a4baa4b19961143e90ddbd02faa1ff321a8742e6ebefd776d7a09d4a8e4aca2b6a6157bba1905f51de54bcfba6ffdfbae71377a6be4bce65332b0b3fa33

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

      Filesize

      7KB

      MD5

      f105965aec4e6b6aa30275c5167567b9

      SHA1

      d8fe2af6a47b1f576cae7c834a0e4b3f5a5544df

      SHA256

      8af8a9fc2772d9233f7162e1aef44cc6e7654667500cbc8c24c6e1eebf8c7a77

      SHA512

      a2c430e6c0513240929143406e7cd3eea05d9ef54f76b43af6112aaad5b2b413ac14e598f393ef89f62e8367f6932894d0fc87f5c9750f7f3fee8eed82103d98

    • \Device\HarddiskVolume1\GET_YOUR_FILES_BACK.txt

      Filesize

      1011B

      MD5

      b69a0aa7abf916a5f00d0f438cf98fa6

      SHA1

      1ad8aec6b066487d69492225bb6493b4afd2db64

      SHA256

      9a3b665f5458ade3c61be4fd2f906a915f8c523127be7456a6bff3677356289d

      SHA512

      cec0c8f59d7c204f33452223b0f9eaa55bc0ef07f983c42fbdd3ff0906814bf907816bd6b4dd2dbb3292f6396f22b50b0736caf469f1a942fdd7cd09c099cd72

    • memory/2088-8148-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-14635-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-2-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-6-0x0000000000240000-0x0000000000241000-memory.dmp

      Filesize

      4KB

    • memory/2088-7-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-4-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-8-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-1-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-5-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-0-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-14636-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-3-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-17367-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-18308-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-18376-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-20777-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-20816-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/2088-24501-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

    • memory/4276-1303-0x00000000003F0000-0x00000000003F8000-memory.dmp

      Filesize

      32KB

    • memory/4276-1258-0x000000001B720000-0x000000001BA02000-memory.dmp

      Filesize

      2.9MB

    • memory/4492-24508-0x000000001B650000-0x000000001B932000-memory.dmp

      Filesize

      2.9MB

    • memory/4492-24509-0x0000000002810000-0x0000000002818000-memory.dmp

      Filesize

      32KB