Overview

overview

10

Static

static

3

c86508858d...4N.exe

windows7-x64

10

c86508858d...4N.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    119s
  • max time network
    127s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    30-12-2024 17:43

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General

  • Target

    c86508858d0d77d2d0e1173048567d2aed229c16be889a8bb663867e263e93d4N.exe

  • Size

    1.1MB

  • MD5

    63f78b94b52347babbb4965413d7c1c0

  • SHA1

    4e80d300969f92bdaf678135b93264b6bd69ffe4

  • SHA256

    c86508858d0d77d2d0e1173048567d2aed229c16be889a8bb663867e263e93d4

  • SHA512

    8c66b90ceabf9d4e29be053c44190926b662998699f091e04136f926371e7dbb3d5670e61b524c787431a25caf464b0906f343e57ab3da6d309413c1b70ced5c

  • SSDEEP

    24576:aImw98okVgela0as5CqLVO7XJCjkD3N0HRA:EL5ljasaU

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 (10360) files with added filename extension

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

    ransomware
  • Executes dropped EXE 1 IoCs
  • 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
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 49 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\c86508858d0d77d2d0e1173048567d2aed229c16be889a8bb663867e263e93d4N.exe
    "C:\Users\Admin\AppData\Local\Temp\c86508858d0d77d2d0e1173048567d2aed229c16be889a8bb663867e263e93d4N.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2764
    • C:\Users\Admin\AppData\Local\Temp\P1kAlMiG2Kb7.scr
      "C:\Users\Admin\AppData\Local\Temp\P1kAlMiG2Kb7.scr" /S
      2⤵
      • Executes dropped EXE
      • 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:2712
      • C:\Windows\system32\cmd.exe
        cmd /c wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2820
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete /nointeractive
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2568
      • C:\Windows\system32\cmd.exe
        cmd /c vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2808
        • C:\Windows\system32\vssadmin.exe
          vssadmin.exe Delete Shadows /All /Quiet
          4⤵
          • Interacts with shadow copies
          PID:2560
      • C:\Windows\system32\cmd.exe
        cmd /c bcdedit /set {default} recoveryenabled No
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2844
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled No
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2352
      • C:\Windows\system32\cmd.exe
        cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2780
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1220
      • C:\Windows\system32\cmd.exe
        cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2204
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:792
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -Command "$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;"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:4952
        • 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\771721075.png /f
          4⤵
          • Sets desktop wallpaper using registry
          PID:3368
        • C:\Windows\system32\rundll32.exe
          "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
          4⤵
            PID:5236
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2416

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\P1kAlMiG2Kb7.scr
      Filesize

      807KB

      MD5

      e27b5291c8fb2dfdeb7f16bb6851df5e

      SHA1

      40207f83b601cd60905c1f807ac0889c80dfe33f

      SHA256

      ffd933ad53f22a0f10cceb4986087258f72dffdd36999b7014c6b37c157ee45f

      SHA512

      2ddbc50cd780ffbf73c354b9b437322eb49cb05bb6f287d54e7dcafb61dc4c4549e37ae2f972f3d240bfa7d2ca485b7583137f1bf038bc901f378cea0c305c6a

      Download Submit

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

      7KB

      MD5

      05b5c8258f08d3d0a56883c182fe713e

      SHA1

      3d1667ef37f2efdce4753d016e6ac29ea17d5f92

      SHA256

      c2fc00a950dc62609702b13c441fcef3b87e962a672bf68f0628a4b1d73ae6d0

      SHA512

      8d9f4aa4f9d9639c996b1331f7d8c798fb3a7dc803fc4481690bcf2ac5c5ffc6eed7b0f8f617c37b699ef99ec3613d1b9dc0002ad48c47e585f683c137518415

      Download Submit

    • \Device\HarddiskVolume1\GET_YOUR_FILES_BACK.txt
      Filesize

      1011B

      MD5

      c92c2b70fb37f84aab38412ad9226aa8

      SHA1

      14f2e9a83285612d0a7b2c83b8f89bccfde6c154

      SHA256

      d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f

      SHA512

      04f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848

      Download Submit

    • memory/792-619-0x000000001B7D0000-0x000000001BAB2000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/792-738-0x0000000001E00000-0x0000000001E08000-memory.dmp

      Filesize

      32KB

      Download

    • memory/2764-5-0x000000013F9B0000-0x000000013FACE000-memory.dmp

      Filesize

      1.1MB

      Download

    • memory/4952-24475-0x000000001B740000-0x000000001BA22000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/4952-24476-0x0000000001E20000-0x0000000001E28000-memory.dmp

      Filesize

      32KB

      Download