Malware Analysis Report

2024-10-10 07:53

Sample ID 240615-ee5zzaybmb
Target gtr.exe
SHA256 b7f599d78c0a3943f299c67088fcb8821833a0fa62bf3f2ae760c85ebb326006
Tags
themida evasion ransomware 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

b7f599d78c0a3943f299c67088fcb8821833a0fa62bf3f2ae760c85ebb326006

Threat Level: Likely malicious

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

Malicious Activity Summary

themida evasion ransomware trojan

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

Modifies boot configuration data using bcdedit

Checks BIOS information in registry

Themida packer

Checks whether UAC is enabled

Suspicious use of NtSetInformationThreadHideFromDebugger

Unsigned PE

Modifies data under HKEY_USERS

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-15 03:52

Signatures

Themida packer

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

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-15 03:52

Reported

2024-06-15 03:53

Platform

win11-20240611-en

Max time kernel

14s

Max time network

16s

Command Line

"C:\Users\Admin\AppData\Local\Temp\gtr.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\gtr.exe N/A

Modifies boot configuration data using bcdedit

ransomware evasion
Description Indicator Process Target
N/A N/A C:\Windows\system32\bcdedit.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\gtr.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\gtr.exe N/A

Themida packer

themida
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A 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\gtr.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

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

Modifies data under HKEY_USERS

Description Indicator Process Target
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\ColorizationAfterglowBalance = "10" 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
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent 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\DWM\ColorizationColor = "3288365268" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" 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
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\EnableWindowColorization = "5" 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
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" 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\AccentColor = "4292114432" C:\Windows\system32\LogonUI.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeShutdownPrivilege N/A C:\Windows\system32\shutdown.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\system32\shutdown.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3080 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 1440 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 1440 wrote to memory of 5068 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 1440 wrote to memory of 5068 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\bcdedit.exe
PID 3080 wrote to memory of 1224 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 1224 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 2472 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 2472 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 1200 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 1200 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 4812 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 4812 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 3924 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 3924 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 3376 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3080 wrote to memory of 3376 N/A C:\Users\Admin\AppData\Local\Temp\gtr.exe C:\Windows\system32\cmd.exe
PID 3376 wrote to memory of 2944 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\shutdown.exe
PID 3376 wrote to memory of 2944 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\shutdown.exe

Processes

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

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

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c bcdedit /set hypervisorlaunchtype off >nul 2>&1

C:\Windows\system32\bcdedit.exe

bcdedit /set hypervisorlaunchtype off

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c cls

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c cls

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c cls

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c cls

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c cls

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c shutdown /r /f /t 0 >nul 2>&1

C:\Windows\system32\shutdown.exe

shutdown /r /f /t 0

C:\Windows\system32\LogonUI.exe

"LogonUI.exe" /flags:0x4 /state0:0xa3a14855 /state1:0x41c64e6d

Network

Country Destination Domain Proto
IE 52.111.236.23:443 tcp

Files

memory/3080-0-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-1-0x00007FFDF3E47000-0x00007FFDF3E49000-memory.dmp

memory/3080-2-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-3-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-4-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-6-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-5-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-7-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp

memory/3080-9-0x00007FF7983A0000-0x00007FF79916A000-memory.dmp