Overview

overview

10

Static

static

3

AvosLocker.exe

windows7-x64

10

AvosLocker.exe

windows10-1703-x64

10

AvosLocker.exe

windows10-2004-x64

10

AvosLocker.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    5s
  • max time network
    21s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    17-09-2024 02:23

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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 (3054) files with added filename extension

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

    ransomware
  • 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
  • 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
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 44 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe
    "C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe"
    1⤵
    • 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:3104
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3416
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:38852
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
        PID:592
        • C:\Windows\system32\vssadmin.exe
          vssadmin.exe Delete Shadows /All /Quiet
          3⤵
          • Interacts with shadow copies
          PID:17348
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c bcdedit /set {default} recoveryenabled No
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1852
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled No
          3⤵
          • Modifies boot configuration data using bcdedit
          PID:38844
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:864
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          3⤵
          • Modifies boot configuration data using bcdedit
          PID:38880
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:796
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:38896
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -Command "$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
        PID:29360
        • 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\1470808746.png /f
          3⤵
            PID:36824
          • C:\Windows\system32\rundll32.exe
            "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
            3⤵
              PID:36636
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
            PID:10796

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\GET_YOUR_FILES_BACK.txt
            Filesize

            1011B

            MD5

            01188d22b1675e3437b1418e14f4ffab

            SHA1

            6e7127f3bbfce49485ed8f1acf8f697bcb952818

            SHA256

            e4b3ac00a0b2eb195b26abffbc4368077384e73393e51605edda17dae05ab7f2

            SHA512

            6903ae3247f32ad79c60a2062cd6a7bdbf5a7c9db1bdc43bdbef4da3396945014d30968ea4c8531a2d0c7b695f1ea36e2b8c51bb39cc6157c4096ac04a6e187d

            Download Submit

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

            3KB

            MD5

            5d574dc518025fad52b7886c1bff0e13

            SHA1

            68217a5f9e9a64ca8fed9eefa4171786a8f9f8f7

            SHA256

            755c4768f6e384030805284ab88689a325431667e9ab11d9aeaa55e9739742f2

            SHA512

            21de152e07d269b265dae58d46e8c68a3268b2f78d771d4fc44377a14e0c6e73aadae923dcfd34ce2ef53c2eaa53d4df8f281d9b8a627edee213946c9ef37d13

            Download Submit

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

            1KB

            MD5

            cfa61f06713f00bdd3e7fd7fe0ae44d9

            SHA1

            746adee259da003d65fcfb35c889a53720feb7f8

            SHA256

            8c92a68c4300add9aad716a454a5e723776aed0e092eeb8fd8e891d8b01b6625

            SHA512

            037b0be722df3a9383bca6189bc177f4d63b4dd887a73bcce67cac83cbf850f9bb860fe4d776166b5880a02e04ad5131cebbd921cf62afea6228cd2de36c1d3e

            Download Submit

          • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rf0ja140.mds.ps1
            Filesize

            1B

            MD5

            c4ca4238a0b923820dcc509a6f75849b

            SHA1

            356a192b7913b04c54574d18c28d46e6395428ab

            SHA256

            6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

            SHA512

            4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

            Download Submit

          • memory/38896-8558-0x00007FFEBBF70000-0x00007FFEBC95C000-memory.dmp

            Filesize

            9.9MB

            Download

          • memory/38896-8557-0x00007FFEBBF73000-0x00007FFEBBF74000-memory.dmp

            Filesize

            4KB

            Download

          • memory/38896-8559-0x0000016EF1D60000-0x0000016EF1D82000-memory.dmp

            Filesize

            136KB

            Download

          • memory/38896-8562-0x0000016EF2120000-0x0000016EF2196000-memory.dmp

            Filesize

            472KB

            Download

          • memory/38896-22614-0x00007FFEBBF70000-0x00007FFEBC95C000-memory.dmp

            Filesize

            9.9MB

            Download