Malware Analysis Report

2025-01-22 20:51

Sample ID 241225-cfnqzatqfm
Target test.exe
SHA256 f5880e3ce512f648351291a3728b13adb6c87954f9a88c3070dce9f4c5c5b1f4
Tags
avoslocker defense_evasion discovery evasion execution impact ransomware
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

f5880e3ce512f648351291a3728b13adb6c87954f9a88c3070dce9f4c5c5b1f4

Threat Level: Known bad

The file test.exe was found to be: Known bad.

Malicious Activity Summary

avoslocker defense_evasion discovery evasion execution impact ransomware

Avoslocker family

Avoslocker Ransomware

Renames multiple (10402) files with added filename extension

Deletes shadow copies

Modifies boot configuration data using bcdedit

Drops desktop.ini file(s)

Enumerates connected drives

Sets desktop wallpaper using registry

Drops file in Program Files directory

Unsigned PE

Command and Scripting Interpreter: PowerShell

System Location Discovery: System Language Discovery

Uses Volume Shadow Copy service COM API

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Interacts with shadow copies

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-25 02:01

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-25 02:01

Reported

2024-12-25 02:03

Platform

win7-20241010-en

Max time kernel

118s

Max time network

119s

Command Line

"C:\Users\Admin\AppData\Local\Temp\test.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Avoslocker family

avoslocker

Deletes shadow copies

ransomware defense_evasion impact execution

Modifies boot configuration data using bcdedit

ransomware evasion
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 (10402) files with added filename extension

ransomware

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\test.exe N/A

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\test.exe N/A

Sets desktop wallpaper using registry

ransomware
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1099485973.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 Photo Viewer\it-IT\PhotoAcq.dll.mui C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jre7\lib\zi\Africa\Abidjan C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\NavigationRight_ButtonGraphic.png C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Templates\1033\ONENOTE\14\Stationery\BUSINESS.ONE C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\PDIR51B.GIF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BD19986_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0240291.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\MP00132_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Stacking\NavigationLeft_SelectionSubpicture.png C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files (x86)\Microsoft Visual Studio 8\Common7\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\NA00238_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Common Files\microsoft shared\ink\it-IT\micaut.dll.mui C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Windows Sidebar\Gadgets\CPU.Gadget\de-DE\gadget.xml C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Indian\Mahe C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Document Themes 14\Theme Colors\Essential.xml C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BL00526_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\zi\Asia\Dushanbe C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files\Common Files\Microsoft Shared\TextConv\it-IT\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Adobe\Reader 9.0\Resource\TypeSupport\Unicode\Mappings\Mac\ROMANIAN.TXT C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Windows Sidebar\Gadgets\Weather.Gadget\ja-JP\weather.html C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\1033\GrooveForms5\FormsStyles\BrightYellow\HEADER.GIF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\BULLETS\BD21366_.GIF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BL00008_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0212299.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files (x86)\Common Files\microsoft shared\VSTA\8.0\x86\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jre7\lib\deploy\messages_ja.properties C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\platform\modules\locale\org-netbeans-swing-plaf_ja.jar C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\BULLETS\BD21337_.GIF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\SY01462_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Common Files\microsoft shared\ink\de-DE\micaut.dll.mui C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Windows Sidebar\Gadgets\Clock.Gadget\en-US\css\settings.css C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\manifest.json C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBFTSCM\SCHEME49.CSS C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\VCTRN_01.MID C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\visualvm\visualvm\modules\com-sun-tools-visualvm-attach.jar C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\lib\missioncontrol\plugins\com.jrockit.mc.console.ui.notification_5.5.0.165303\plugin.xml C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\Weather.Gadget\images\docked_gray_thunderstorm.png C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\Currency.Gadget\es-ES\css\currency.css C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\Currency.Gadget\en-US\js\library.js C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\MEDIA\CAGCAT10\J0299171.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0183574.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\DVD Maker\Shared\DvdStyles\Pets\Pets_frame-border.png C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files (x86)\Windows Sidebar\Gadgets\PicturePuzzle.Gadget\it-IT\css\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Photo Viewer\fr-FR\PhotoViewer.dll.mui C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Photo Viewer\de-DE\PhotoViewer.dll.mui C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\ADVZIP.DIC C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Java\jdk1.7.0_80\jre\lib\images\cursors\win32_CopyNoDrop32x32.gif C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolBMPs\DataViewIconImages.jpg C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files\Common Files\Microsoft Shared\ink\ipsptb.xml C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\RSSFeeds.Gadget\ja-JP\flyout.html C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBSPAPR\ZPDIR46B.GIF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\MEDIA\OFFICE14\AUTOSHAP\BD18256_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0152696.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBFTSCM\SCHEME18.CSS C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\BD00155_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\DD01145_.WMF C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\Weather.Gadget\images\undocked_black_moon-new_partly-cloudy.png C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files (x86)\Windows Defender\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\PAGESIZE\PGMN110.XML C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\Office14\MEDIA\CASHREG.WAV C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File created C:\Program Files (x86)\Microsoft Office\Office14\Groove\ToolData\groove.net\GrooveForms4\FormsStyles\SoftBlue\GET_YOUR_FILES_BACK.txt C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\J0382955.JPG C:\Users\Admin\AppData\Local\Temp\test.exe N/A
File opened for modification C:\Program Files (x86)\Common Files\microsoft shared\Smart Tag\LISTS\1033\STOCKS.DAT C:\Users\Admin\AppData\Local\Temp\test.exe N/A

Command and Scripting Interpreter: PowerShell

execution
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

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\test.exe N/A

Interacts with shadow copies

ransomware
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\test.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

Description Indicator Process Target
Token: SeTakeOwnershipPrivilege N/A C:\Users\Admin\AppData\Local\Temp\test.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: 33 N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: 34 N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: 35 N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeAuditPrivilege N/A C:\Windows\system32\vssvc.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: 33 N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: 34 N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: 35 N/A C:\Windows\System32\Wbem\WMIC.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2676 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 1736 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2484 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2484 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2484 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2484 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2424 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2424 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2424 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2424 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2368 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2368 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2368 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2676 wrote to memory of 2368 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\system32\cmd.exe
PID 2368 wrote to memory of 1548 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2368 wrote to memory of 1548 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2368 wrote to memory of 1548 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1736 wrote to memory of 696 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\Wbem\WMIC.exe
PID 1736 wrote to memory of 696 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\Wbem\WMIC.exe
PID 1736 wrote to memory of 696 N/A C:\Windows\system32\cmd.exe C:\Windows\System32\Wbem\WMIC.exe
PID 2424 wrote to memory of 952 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 2424 wrote to memory of 952 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 2424 wrote to memory of 952 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 2468 wrote to memory of 1672 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 2468 wrote to memory of 1672 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 2468 wrote to memory of 1672 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 2484 wrote to memory of 1784 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 2484 wrote to memory of 1784 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 2484 wrote to memory of 1784 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\vssadmin.exe
PID 2676 wrote to memory of 6032 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2676 wrote to memory of 6032 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2676 wrote to memory of 6032 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2676 wrote to memory of 6032 N/A C:\Users\Admin\AppData\Local\Temp\test.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 6032 wrote to memory of 5512 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\system32\reg.exe
PID 6032 wrote to memory of 5512 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\system32\reg.exe
PID 6032 wrote to memory of 5512 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\system32\reg.exe
PID 6032 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\system32\rundll32.exe
PID 6032 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\system32\rundll32.exe
PID 6032 wrote to memory of 2424 N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe C:\Windows\system32\rundll32.exe

Uses Volume Shadow Copy service COM API

ransomware

Processes

C:\Users\Admin\AppData\Local\Temp\test.exe

"C:\Users\Admin\AppData\Local\Temp\test.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\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\bcdedit.exe

bcdedit /set {default} recoveryenabled No

C:\Windows\system32\bcdedit.exe

bcdedit /set {default} bootstatuspolicy ignoreallfailures

C:\Windows\system32\vssadmin.exe

vssadmin.exe Delete Shadows /All /Quiet

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\1099485973.png /f

C:\Windows\system32\rundll32.exe

"C:\Windows\system32\rundll32.exe" user32.dll UpdatePerUserSystemParameters 0 False

Network

N/A

Files

C:\GET_YOUR_FILES_BACK.txt

MD5 c92c2b70fb37f84aab38412ad9226aa8
SHA1 14f2e9a83285612d0a7b2c83b8f89bccfde6c154
SHA256 d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f
SHA512 04f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848

memory/1548-706-0x000000001B690000-0x000000001B972000-memory.dmp

memory/1548-794-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

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

MD5 955e9adc3ade453bbcb8ea667cb5abbc
SHA1 b69c2c01968182b3639ed60a5948e9119bc89e38
SHA256 66da87fac81f891ac983d5c882541b54c1203c4b718a088aff34796c4e229dde
SHA512 54ba3199bbd2b92336b071a08207736bd843a567eb6ed77b9d684606a66608e0f431b8c89ea97c888bb0c40729d3a0596413ff8362fffcd67b8636de8d7c145b

memory/6032-24554-0x0000000001F70000-0x0000000001F78000-memory.dmp

memory/6032-24553-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\1099485973.png

MD5 1102d805d581b2642cec9945747c8968
SHA1 272aa475615770fe25968fc1787353ca08c89953
SHA256 59fde654769fa30863cfb5ae13b21c5adb797f59d810471ea47cf46c2f0dacc0
SHA512 aa3b456f24f541a9408653984d8916ba7e6eb7c18f3e0a054f01836c4ec0bfd3c186e7369a077adef7ee73b5452b3ad87b8a3b338aebe5482171e5fdbf1b54c0

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-25 02:01

Reported

2024-12-25 02:01

Platform

win10v2004-20241007-en

Max time kernel

5s

Max time network

5s

Command Line

"C:\Users\Admin\AppData\Local\Temp\test.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Avoslocker family

avoslocker

Deletes shadow copies

ransomware defense_evasion impact execution

Modifies boot configuration data using bcdedit

ransomware evasion
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

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\Z: C:\Users\Admin\AppData\Local\Temp\test.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\test.exe N/A

Interacts with shadow copies

ransomware
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\test.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\test.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeTakeOwnershipPrivilege N/A C:\Users\Admin\AppData\Local\Temp\test.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\test.exe

"C:\Users\Admin\AppData\Local\Temp\test.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\bcdedit.exe

bcdedit /set {default} recoveryenabled No

C:\Windows\system32\vssadmin.exe

vssadmin.exe Delete Shadows /All /Quiet

C:\Windows\system32\bcdedit.exe

bcdedit /set {default} bootstatuspolicy ignoreallfailures

Network

Country Destination Domain Proto
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp

Files

C:\GET_YOUR_FILES_BACK.txt

MD5 c92c2b70fb37f84aab38412ad9226aa8
SHA1 14f2e9a83285612d0a7b2c83b8f89bccfde6c154
SHA256 d64639e873c0873b469cd856d1ef4bce7dc14a80fac6fe2bed9d629f05acc77f
SHA512 04f9dcb3cd49909712535255b6eadd7fafcb2902bf1abd5a25e9bb5f5c4dc032611aec0a5b0ec89cd7dbc65276b935c54b906b391507d2e3e3aa65466b15f848