Overview

overview

10

Static

static

3

AvosLocker.exe

windows7-x64

10

AvosLocker.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    65s
  • max time network
    16s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    10-09-2024 21:10

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General

  • Target

    AvosLocker.exe

  • Size

    807KB

  • MD5

    8da384b2427b8397a5934182c159c257

  • SHA1

    7bcd2d32a19c1ac7bd014dc9e64b806fdff5f5de

  • SHA256

    f8e99bbacc62b0f72aa12f5f92e35607fa0382a881fe4a4b9476fc6b87a03c78

  • SHA512

    3c4b1736efa48a4897769f12df488e60737523eaffc886ecfbd5b7191f058749bdb4a36feb067e8ca0ef418a7602b3390b6cf465412b88a4ba2fce8a4d670a89

  • SSDEEP

    12288:0Z4s3rg9u/2/oT+NXtHLlP/O+OeO+OeNhBBhhBBAtHg9rjI+LXJ0ivlzkHBDsYAu:u4s+oT+NXBLi0rjFXvyHBlb6CZa8

Score
10/10
avoslockerdefense_evasiondiscoveryevasionexecutionimpactransomware

Malware Config

Signatures

  • Avoslocker Ransomware

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

    ransomwareavoslocker
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomwaredefense_evasionimpactexecution
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
    ransomwareevasion
  • Renames multiple (10393) files with added filename extension

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

    ransomware
  • 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
    ransomware
  • Drops file in Program Files directory 64 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Using powershell.exe command.

    execution
  • 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.

    discovery
  • Interacts with shadow copies 3 TTPs 1 IoCs

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

    ransomware
  • Opens file in notepad (likely ransom note) 1 IoCs
    ransomware
  • 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.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe
    "C:\Users\Admin\AppData\Local\Temp\AvosLocker.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:1200
    • C:\Windows\system32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1080
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1504
    • C:\Windows\system32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1100
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:1720
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} recoveryenabled No
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1216
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} recoveryenabled No
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:1052
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2304
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:2456
    • C:\Windows\system32\cmd.exe
      cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1376
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2812
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "$a = [System.IO.File]::ReadAllText(\"F:\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:4564
      • 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\1379146745.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:6720
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:7160
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4020
    • C:\Windows\system32\NOTEPAD.EXE
      "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\GET_YOUR_FILES_BACK.txt
      1⤵
      • Opens file in notepad (likely ransom note)
      PID:6364

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

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

      7KB

      MD5

      181d08739c3cff9363a15904ae10b8b8

      SHA1

      b15092ecb2cf474483e4a0ebbe1da7348b365b45

      SHA256

      f1ef56c194755ad0185c3b8e15c5d91de2a76df040894959384430af214a08e2

      SHA512

      6be1ca56923f16957d600269c28340603e225eab970b841ec1f36573e2a6d9be8699cd96575ff0933044adcfb5ac571399e6be7b59926a68107e660deb73fe7f

      Download Submit

    • C:\Users\GET_YOUR_FILES_BACK.txt
      Filesize

      1011B

      MD5

      01188d22b1675e3437b1418e14f4ffab

      SHA1

      6e7127f3bbfce49485ed8f1acf8f697bcb952818

      SHA256

      e4b3ac00a0b2eb195b26abffbc4368077384e73393e51605edda17dae05ab7f2

      SHA512

      6903ae3247f32ad79c60a2062cd6a7bdbf5a7c9db1bdc43bdbef4da3396945014d30968ea4c8531a2d0c7b695f1ea36e2b8c51bb39cc6157c4096ac04a6e187d

      Download Submit

    • memory/2812-1156-0x000000001B570000-0x000000001B852000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/2812-1322-0x0000000002240000-0x0000000002248000-memory.dmp

      Filesize

      32KB

      Download

    • memory/4564-24534-0x0000000001E70000-0x0000000001E78000-memory.dmp

      Filesize

      32KB

      Download

    • memory/4564-24533-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

      Filesize

      2.9MB

      Download