Malware Analysis Report

2024-10-16 03:26

Sample ID 240418-f9mbsace68
Target f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118
SHA256 a1b504b8e34200d8029f6d75491d517e460162cb9df438257ee4ed85f61c18bc
Tags
avoslocker 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

a1b504b8e34200d8029f6d75491d517e460162cb9df438257ee4ed85f61c18bc

Threat Level: Known bad

The file f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118 was found to be: Known bad.

Malicious Activity Summary

avoslocker ransomware

Avoslocker Ransomware

Renames multiple (155) files with added filename extension

Renames multiple (160) files with added filename extension

Sets desktop wallpaper using registry

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-18 05:34

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-18 05:34

Reported

2024-04-18 05:36

Platform

win7-20240221-en

Max time kernel

119s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Renames multiple (160) files with added filename extension

ransomware

Sets desktop wallpaper using registry

ransomware
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2297530677-1229052932-2803917579-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1440385283.png" C:\Windows\SysWOW64\reg.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 2136 wrote to memory of 3236 N/A C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2136 wrote to memory of 3236 N/A C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2136 wrote to memory of 3236 N/A C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2136 wrote to memory of 3236 N/A C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 3236 wrote to memory of 3368 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 3236 wrote to memory of 3368 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 3236 wrote to memory of 3368 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 3236 wrote to memory of 3368 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\reg.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe
PID 3236 wrote to memory of 3416 N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.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\1440385283.png /f

C:\Windows\SysWOW64\rundll32.exe

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

Network

N/A

Files

C:\GET_YOUR_FILES_BACK.txt

MD5 9cd17876488bd2c2b81b965620b9aa14
SHA1 f5305680ebd56c1eebc1797c6a7ce93117c3423c
SHA256 08152eb79c4f4b16badb06fe231da164570b62999357c8da8659e6d024f11127
SHA512 7eea1d69e706ef86c0d2343630bc3553b2d5418523d2e4aabcc66d1c0ea3754351ed4c0ab6c185eabbd313f5333d56182c0a9e873aa05b1c5e514e9a3dfceb8d

memory/3236-400-0x0000000074460000-0x0000000074A0B000-memory.dmp

memory/3236-401-0x0000000074460000-0x0000000074A0B000-memory.dmp

memory/3236-402-0x0000000002870000-0x00000000028B0000-memory.dmp

memory/3236-405-0x0000000074460000-0x0000000074A0B000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\1440385283.png

MD5 872f2818b8dd4aa2fe819ad63cc3d349
SHA1 f95a28516f592d2191b8432744b727f69989b861
SHA256 1134162a0e341473f75eac201100f066d39c2e10408161222b83ab8e8a418a98
SHA512 49c2a6c15de1bf682a1a86e84bc36d2b12971be0b1b834e06c2cf34b94b0194d6e79f44c2e5d190794df5d22699aec86d59432e0ac2f5299ba11e8e85b08d9f9

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-18 05:34

Reported

2024-04-18 05:37

Platform

win10v2004-20240412-en

Max time kernel

146s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe"

Signatures

Avoslocker Ransomware

ransomware avoslocker

Renames multiple (155) files with added filename extension

ransomware

Sets desktop wallpaper using registry

ransomware
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4092317236-2027488869-1227795436-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1539987827.png" C:\Windows\SysWOW64\reg.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\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\f75e92b4cf12745c63966bb50c82e4be_JaffaCakes118.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\1539987827.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 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 18.24.18.2.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 25.24.18.2.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp

Files

C:\GET_YOUR_FILES_BACK.txt

MD5 9cd17876488bd2c2b81b965620b9aa14
SHA1 f5305680ebd56c1eebc1797c6a7ce93117c3423c
SHA256 08152eb79c4f4b16badb06fe231da164570b62999357c8da8659e6d024f11127
SHA512 7eea1d69e706ef86c0d2343630bc3553b2d5418523d2e4aabcc66d1c0ea3754351ed4c0ab6c185eabbd313f5333d56182c0a9e873aa05b1c5e514e9a3dfceb8d

memory/4232-426-0x00000000030A0000-0x00000000030D6000-memory.dmp

memory/4232-427-0x0000000074C90000-0x0000000075440000-memory.dmp

memory/4232-428-0x0000000003090000-0x00000000030A0000-memory.dmp

memory/4232-429-0x0000000003090000-0x00000000030A0000-memory.dmp

memory/4232-430-0x0000000005820000-0x0000000005E48000-memory.dmp

memory/4232-431-0x0000000005670000-0x0000000005692000-memory.dmp

memory/4232-432-0x0000000005720000-0x0000000005786000-memory.dmp

memory/4232-435-0x0000000006000000-0x0000000006066000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cqj4xyne.pmc.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4232-443-0x0000000006280000-0x00000000065D4000-memory.dmp

memory/4232-444-0x0000000006660000-0x000000000667E000-memory.dmp

memory/4232-445-0x0000000006710000-0x000000000675C000-memory.dmp

memory/4232-447-0x0000000003090000-0x00000000030A0000-memory.dmp

memory/4232-448-0x0000000007CE0000-0x000000000835A000-memory.dmp

memory/4232-449-0x0000000006BA0000-0x0000000006BBA000-memory.dmp

memory/4232-450-0x0000000007AD0000-0x0000000007B62000-memory.dmp

memory/4232-454-0x0000000074C90000-0x0000000075440000-memory.dmp