Malware Analysis Report

2025-06-16 03:38

Sample ID 240526-rl5zrshh87
Target 1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221
SHA256 1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
9/10

SHA256

1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221

Threat Level: Likely malicious

The file 1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221 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

Identifies Wine through registry keys

Checks whether UAC is enabled

Writes to the Master Boot Record (MBR)

Suspicious use of NtSetInformationThreadHideFromDebugger

Unsigned PE

Suspicious use of SetWindowsHookEx

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-26 14:17

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-26 14:17

Reported

2024-05-26 14:20

Platform

win7-20240221-en

Max time kernel

143s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Identifies Wine through registry keys

evasion
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Wine C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe

"C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe"

Network

N/A

Files

memory/1688-0-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-1-0x00000000765E0000-0x00000000765E1000-memory.dmp

memory/1688-4-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-5-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-6-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-7-0x0000000000400000-0x00000000036B8000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\pcsf.ini

MD5 681496ec06a1de0b86c016432b484d1c
SHA1 d7cd30308a7865424124b448638ab2701abacb11
SHA256 50ea92c083a43e75d9ddb9f578c18c146fe5202f208d1e3ee0c047c7b544dea8
SHA512 9626c2013693b6d8dc62a6c26115349f88085f3f90c1b8791d7ce52541fe2f62ccbfad56937d14f762d3960c5dca593f8aa7d6de04b102f5b41a638306d71de0

memory/1688-35-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-36-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-37-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-38-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-39-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-40-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-41-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-42-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-43-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1688-44-0x0000000000400000-0x00000000036B8000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-26 14:17

Reported

2024-05-26 14:20

Platform

win10v2004-20240508-en

Max time kernel

142s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Checks BIOS information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Identifies Wine through registry keys

evasion
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Software\Wine C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.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\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Suspicious use of NtSetInformationThreadHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe

"C:\Users\Admin\AppData\Local\Temp\1b55be7a86a29b28efdc8319e54e2f6895e4b41ad245a54ed9aba01efbd9e221.exe"

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4200,i,13035806169561352434,1332896185314862791,262144 --variations-seed-version --mojo-platform-channel-handle=4240 /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.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 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp

Files

memory/1252-0-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-3-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-4-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-5-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-6-0x0000000000400000-0x00000000036B8000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\pcsf.ini

MD5 681496ec06a1de0b86c016432b484d1c
SHA1 d7cd30308a7865424124b448638ab2701abacb11
SHA256 50ea92c083a43e75d9ddb9f578c18c146fe5202f208d1e3ee0c047c7b544dea8
SHA512 9626c2013693b6d8dc62a6c26115349f88085f3f90c1b8791d7ce52541fe2f62ccbfad56937d14f762d3960c5dca593f8aa7d6de04b102f5b41a638306d71de0

memory/1252-34-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-35-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-36-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-37-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-38-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-39-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-40-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-41-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-42-0x0000000000400000-0x00000000036B8000-memory.dmp

memory/1252-43-0x0000000000400000-0x00000000036B8000-memory.dmp