Analysis

  • max time kernel
    120s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    31-05-2024 14:35

General

  • Target

    d17ff05fe3ecccb7d80327f6907c260d336816ec7fb6d3ae54e58de86e2caee4.exe

  • Size

    1000KB

  • MD5

    bdd8042e0cad403db7265bd31c9cac69

  • SHA1

    6ddb13bca925dd49782555ea0cb58dcd89fff96c

  • SHA256

    d17ff05fe3ecccb7d80327f6907c260d336816ec7fb6d3ae54e58de86e2caee4

  • SHA512

    c6a47b4f48e88ba27993b19f928bb9e05b157fc98ba9a702624e4ec2efcb5323e81057e6120dc8c9ae0aa953cffb1fed0c944e229025d2ff05a22ec08e0e87c5

  • SSDEEP

    12288:1EmO+SxQsd/rl/tCJIsREL1Z8a5ghFW2Dd0Ri5cu2V4hib9qVEbBU4x8w9+C0GA9:ujxQajlmIuyDZoqRi5cTNp7bwCRAyC9

Malware Config

Signatures

  • Avoslocker Ransomware

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

  • Renames multiple (10403) files with added filename extension

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

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

    Using powershell.exe command.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d17ff05fe3ecccb7d80327f6907c260d336816ec7fb6d3ae54e58de86e2caee4.exe
    "C:\Users\Admin\AppData\Local\Temp\d17ff05fe3ecccb7d80327f6907c260d336816ec7fb6d3ae54e58de86e2caee4.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2100
    • C:\Windows\SysWOW64\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 AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:856
      • C:\Windows\SysWOW64\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\1859274057.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:848
      • C:\Windows\SysWOW64\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:3400

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • F:\$RECYCLE.BIN\GET_YOUR_FILES_BACK.txt

      Filesize

      1011B

      MD5

      dc0c59133c813e685e54ddf9bcb3601d

      SHA1

      d1d50426e562cc9a103a9f0bb63ae6faea6f410c

      SHA256

      a3f03323980be92cfc02204ecb15d4f282d5190949526dd4c7ff8a5ff0dd1223

      SHA512

      e457096e752303e5695e22bbc989143436f9939d945cff1fbe1d349ea91f2d78a8d46666dbd7ece1d01898b189342889265047515e0890914b81f3e7c823e7c4

    • memory/856-24305-0x0000000074370000-0x000000007491B000-memory.dmp

      Filesize

      5.7MB

    • memory/856-24302-0x0000000074370000-0x000000007491B000-memory.dmp

      Filesize

      5.7MB

    • memory/856-24301-0x0000000074370000-0x000000007491B000-memory.dmp

      Filesize

      5.7MB

    • memory/856-24300-0x0000000074370000-0x000000007491B000-memory.dmp

      Filesize

      5.7MB

    • memory/856-24299-0x0000000074371000-0x0000000074372000-memory.dmp

      Filesize

      4KB

    • memory/2100-15742-0x00000000003B0000-0x00000000003F3000-memory.dmp

      Filesize

      268KB

    • memory/2100-22723-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-1-0x00000000003B0000-0x00000000003F3000-memory.dmp

      Filesize

      268KB

    • memory/2100-6-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-3-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-13181-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-0-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-17774-0x0000000000401000-0x000000000049D000-memory.dmp

      Filesize

      624KB

    • memory/2100-20255-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-2-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-22722-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-24294-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-24295-0x00000000003B0000-0x00000000003F3000-memory.dmp

      Filesize

      268KB

    • memory/2100-24296-0x0000000000401000-0x000000000049D000-memory.dmp

      Filesize

      624KB

    • memory/2100-4-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-7-0x00000000004F0000-0x00000000004F1000-memory.dmp

      Filesize

      4KB

    • memory/2100-9-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-8-0x0000000000400000-0x00000000004E4000-memory.dmp

      Filesize

      912KB

    • memory/2100-5-0x0000000000401000-0x000000000049D000-memory.dmp

      Filesize

      624KB