Malware Analysis Report

2024-10-16 03:26

Sample ID 240529-paxsxaee36
Target 09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35
SHA256 09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35
Tags
avoslocker execution 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

09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35

Threat Level: Known bad

The file 09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35 was found to be: Known bad.

Malicious Activity Summary

avoslocker execution ransomware

Avoslocker Ransomware

Renames multiple (133) files with added filename extension

Renames multiple (175) files with added filename extension

Sets desktop wallpaper using registry

Unsigned PE

Command and Scripting Interpreter: PowerShell

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-29 12:08

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-29 12:08

Reported

2024-05-29 12:10

Platform

win7-20231129-en

Max time kernel

119s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Renames multiple (175) files with added filename extension

ransomware

Sets desktop wallpaper using registry

ransomware
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3627615824-4061627003-3019543961-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1377625139.png" C:\Windows\SysWOW64\reg.exe N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2820 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2820 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2820 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2820 wrote to memory of 1892 N/A C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 1892 wrote to memory of 2268 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 1892 wrote to memory of 2268 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 1892 wrote to memory of 2268 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 1892 wrote to memory of 2268 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 1892 wrote to memory of 992 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe

"C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe"

C:\Windows\SysWOW64\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\SysWOW64\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\1377625139.png /f

C:\Windows\SysWOW64\rundll32.exe

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

Network

N/A

Files

memory/2820-0-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-1-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-2-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-6-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-5-0x0000000000401000-0x00000000004B2000-memory.dmp

memory/2820-4-0x0000000000270000-0x00000000002B5000-memory.dmp

memory/2820-3-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-7-0x0000000000240000-0x0000000000242000-memory.dmp

memory/2820-8-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-9-0x0000000000400000-0x00000000004FF000-memory.dmp

C:\GET_YOUR_FILES_BACK.txt

MD5 56d4bd7f10cb90aad3515b1ad6f6a18e
SHA1 74c6f4a6e24982584f494ad704896585ae6b3df6
SHA256 d3ae28884579358a4a420d503ec0b53b2d208c1421fc74294480fa409e5d0fc9
SHA512 98b10c847f42c533d1ac24c8c05d7ab6d055bd608b5a52d032cbd0304cecab1f8f2e0bdaed7db7313f8de2f820f24a749debe13b512e25a91cb879e4b686848c

memory/2820-439-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/2820-441-0x0000000000401000-0x00000000004B2000-memory.dmp

memory/2820-440-0x0000000000270000-0x00000000002B5000-memory.dmp

memory/1892-444-0x0000000074681000-0x0000000074682000-memory.dmp

memory/1892-445-0x0000000074680000-0x0000000074C2B000-memory.dmp

memory/1892-446-0x0000000074680000-0x0000000074C2B000-memory.dmp

memory/1892-447-0x0000000074680000-0x0000000074C2B000-memory.dmp

memory/1892-448-0x0000000074680000-0x0000000074C2B000-memory.dmp

memory/1892-451-0x0000000074680000-0x0000000074C2B000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-29 12:08

Reported

2024-05-29 12:10

Platform

win10v2004-20240426-en

Max time kernel

93s

Max time network

95s

Command Line

"C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Renames multiple (133) files with added filename extension

ransomware

Sets desktop wallpaper using registry

ransomware
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1451644574.png" C:\Windows\SysWOW64\reg.exe N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe

"C:\Users\Admin\AppData\Local\Temp\09f602b6abe27f0263e87422d890d282c3208d4fb7f41139dcafc9972c36dd35.exe"

C:\Windows\SysWOW64\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\SysWOW64\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\1451644574.png /f

C:\Windows\SysWOW64\rundll32.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 183.142.211.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 14.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

memory/3604-0-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/3604-3-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/3604-8-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/3604-7-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/3604-6-0x0000000000401000-0x00000000004B2000-memory.dmp

memory/3604-4-0x0000000002220000-0x0000000002265000-memory.dmp

memory/3604-5-0x0000000000690000-0x0000000000692000-memory.dmp

memory/3604-2-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/3604-1-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/3604-9-0x0000000000400000-0x00000000004FF000-memory.dmp

C:\Users\GET_YOUR_FILES_BACK.txt

MD5 56d4bd7f10cb90aad3515b1ad6f6a18e
SHA1 74c6f4a6e24982584f494ad704896585ae6b3df6
SHA256 d3ae28884579358a4a420d503ec0b53b2d208c1421fc74294480fa409e5d0fc9
SHA512 98b10c847f42c533d1ac24c8c05d7ab6d055bd608b5a52d032cbd0304cecab1f8f2e0bdaed7db7313f8de2f820f24a749debe13b512e25a91cb879e4b686848c

memory/3604-395-0x0000000000401000-0x00000000004B2000-memory.dmp

memory/3604-394-0x0000000002220000-0x0000000002265000-memory.dmp

memory/3604-393-0x0000000000400000-0x00000000004FF000-memory.dmp

memory/5780-396-0x000000007458E000-0x000000007458F000-memory.dmp

memory/5780-397-0x0000000005240000-0x0000000005276000-memory.dmp

memory/5780-398-0x0000000005990000-0x0000000005FB8000-memory.dmp

memory/5780-399-0x0000000074580000-0x0000000074D30000-memory.dmp

memory/5780-400-0x0000000074580000-0x0000000074D30000-memory.dmp

memory/5780-401-0x0000000005850000-0x0000000005872000-memory.dmp

memory/5780-402-0x0000000006130000-0x0000000006196000-memory.dmp

memory/5780-403-0x0000000006210000-0x0000000006276000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_jik5dllp.2pa.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/5780-413-0x0000000006420000-0x0000000006774000-memory.dmp

memory/5780-414-0x0000000006800000-0x000000000681E000-memory.dmp

memory/5780-415-0x0000000006840000-0x000000000688C000-memory.dmp

memory/5780-417-0x0000000007E40000-0x00000000084BA000-memory.dmp

memory/5780-418-0x0000000006D50000-0x0000000006D6A000-memory.dmp

memory/5780-419-0x0000000007BD0000-0x0000000007C62000-memory.dmp

memory/5780-420-0x0000000074580000-0x0000000074D30000-memory.dmp

memory/5780-424-0x0000000074580000-0x0000000074D30000-memory.dmp