Malware Analysis Report

2025-03-15 03:13

Sample ID 240105-w1f2eahdh3
Target VIRUS.exe
SHA256 3d646f6887111d21aa9de74404f2952a03ed724d0a1f08fef901fbed5d77a044
Tags
pyinstaller empyrean
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

3d646f6887111d21aa9de74404f2952a03ed724d0a1f08fef901fbed5d77a044

Threat Level: Known bad

The file VIRUS.exe was found to be: Known bad.

Malicious Activity Summary

pyinstaller empyrean

Detects Empyrean stealer

Empyrean family

Unsigned PE

Enumerates physical storage devices

Detects Pyinstaller

Suspicious use of WriteProcessMemory

Suspicious behavior: GetForegroundWindowSpam

Modifies registry class

Opens file in notepad (likely ransom note)

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-01-05 18:23

Signatures

Detects Empyrean stealer

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

Empyrean family

empyrean

Detects Pyinstaller

pyinstaller
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

2024-01-05 18:23

Reported

2024-01-05 18:25

Platform

win7-20231215-en

Max time kernel

21s

Max time network

23s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\main.pyc

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000_Classes\Local Settings C:\Windows\system32\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2224 wrote to memory of 2740 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 2224 wrote to memory of 2740 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 2224 wrote to memory of 2740 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\main.pyc

C:\Windows\system32\rundll32.exe

"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Local\Temp\main.pyc

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-05 18:23

Reported

2024-01-05 18:25

Platform

win10v2004-20231215-en

Max time kernel

62s

Max time network

73s

Command Line

cmd /c C:\Users\Admin\AppData\Local\Temp\main.pyc

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-1815711207-1844170477-3539718864-1000_Classes\Local Settings C:\Windows\system32\cmd.exe N/A
Key created \REGISTRY\USER\S-1-5-21-1815711207-1844170477-3539718864-1000_Classes\Local Settings C:\Windows\system32\OpenWith.exe N/A

Opens file in notepad (likely ransom note)

ransomware
Description Indicator Process Target
N/A N/A C:\Windows\system32\NOTEPAD.EXE N/A

Suspicious behavior: GetForegroundWindowSpam

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3888 wrote to memory of 2616 N/A C:\Windows\system32\OpenWith.exe C:\Windows\system32\NOTEPAD.EXE
PID 3888 wrote to memory of 2616 N/A C:\Windows\system32\OpenWith.exe C:\Windows\system32\NOTEPAD.EXE

Processes

C:\Windows\system32\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\main.pyc

C:\Windows\system32\OpenWith.exe

C:\Windows\system32\OpenWith.exe -Embedding

C:\Windows\system32\NOTEPAD.EXE

"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\main.pyc

Network

Country Destination Domain Proto
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 150.1.37.23.in-addr.arpa udp
US 8.8.8.8:53 17.53.126.40.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 11.2.37.23.in-addr.arpa udp

Files

N/A