Malware Analysis Report

2024-10-18 22:07

Sample ID 240611-sj3x3a1enc
Target Themida64.exe
SHA256 0486a1c12b05214b01ecf642e4c9c0159a767e507a4472cf8fda68deefe02786
Tags
bootkit evasion persistence trojan
score
9/10

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 Overview

score
9/10

SHA256

0486a1c12b05214b01ecf642e4c9c0159a767e507a4472cf8fda68deefe02786

Threat Level: Likely malicious

The file Themida64.exe was found to be: Likely malicious.

Malicious Activity Summary

bootkit evasion persistence trojan

Identifies VirtualBox via ACPI registry values (likely anti-VM)

Checks BIOS information in registry

Checks whether UAC is enabled

Writes to the Master Boot Record (MBR)

Suspicious use of NtSetInformationThreadHideFromDebugger

Modifies data under HKEY_USERS

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-11 15:10

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-11 15:10

Reported

2024-06-11 15:12

Platform

win11-20240508-en

Max time kernel

26s

Max time network

29s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Themida64.exe"

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM)

evasion
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A

Checks whether UAC is enabled

evasion trojan
Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A

Modifies data under HKEY_USERS

Description Indicator Process Target
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "235" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4290799360" C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" C:\Windows\system32\LogonUI.exe N/A
Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = 99ebff004cc2ff000091f8000078d4000067c000003e9200001a6800f7630c00 C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292114432" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365268" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365268" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292114432" C:\Windows\system32\LogonUI.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Themida64.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\LogonUI.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Themida64.exe

"C:\Users\Admin\AppData\Local\Temp\Themida64.exe"

C:\Windows\system32\LogonUI.exe

"LogonUI.exe" /flags:0x4 /state0:0xa3a0e055 /state1:0x41c64e6d

Network

Country Destination Domain Proto
GB 88.221.135.27:443 tcp
US 8.8.8.8:53 browser.pipe.aria.microsoft.com udp
GB 88.221.135.27:443 tcp
GB 88.221.135.27:443 tcp
GB 88.221.135.24:443 tcp

Files

memory/4560-0-0x0000000076D46000-0x0000000076D47000-memory.dmp

memory/4560-1-0x0000000076D30000-0x0000000076E20000-memory.dmp

memory/4560-2-0x0000000076D30000-0x0000000076E20000-memory.dmp

memory/4560-3-0x0000000076D30000-0x0000000076E20000-memory.dmp

memory/4560-4-0x0000000076D30000-0x0000000076E20000-memory.dmp

memory/4560-6-0x0000000000400000-0x0000000004CA9000-memory.dmp

memory/4560-7-0x0000000000400000-0x0000000004CA9000-memory.dmp

memory/4560-8-0x0000000000400000-0x0000000004CA9000-memory.dmp

memory/4560-9-0x0000000000400000-0x0000000004CA9000-memory.dmp

memory/4560-10-0x0000000000400000-0x0000000004CA9000-memory.dmp

memory/4560-13-0x0000000076D30000-0x0000000076E20000-memory.dmp

memory/4560-12-0x0000000000400000-0x0000000004CA9000-memory.dmp