Malware Analysis Report

2024-11-30 13:35

Sample ID 240603-3g99gada9t
Target Fluxus.exe
SHA256 fdf87242103dbee69ddf44b5766da2587291b0e7a8b85a35459e5084d5eb7b3e
Tags
pyinstaller
score
4/10

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
4/10

SHA256

fdf87242103dbee69ddf44b5766da2587291b0e7a8b85a35459e5084d5eb7b3e

Threat Level: Likely benign

The file Fluxus.exe was found to be: Likely benign.

Malicious Activity Summary

pyinstaller

Drops file in Windows directory

Enumerates physical storage devices

Detects Pyinstaller

Unsigned PE

Modifies registry class

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious behavior: AddClipboardFormatListener

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-03 23:30

Signatures

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

2024-06-03 23:30

Reported

2024-06-03 23:31

Platform

win7-20240508-en

Max time kernel

23s

Max time network

17s

Command Line

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

Signatures

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Debug\WIA\wiatrace.log C:\Windows\system32\mspaint.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\pyc_auto_file C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\pyc_auto_file\ C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\pyc_auto_file\shell C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\pyc_auto_file\shell\edit\command C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\pyc_auto_file\shell\edit\command\ = "\"%systemroot%\\system32\\mspaint.exe\" \"%1\"" C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_Classes\Local Settings C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\.pyc C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\.pyc\ = "pyc_auto_file" C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3691908287-3775019229-3534252667-1000_CLASSES\pyc_auto_file\shell\edit C:\Windows\system32\rundll32.exe N/A

Suspicious behavior: AddClipboardFormatListener

Description Indicator Process Target
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Windows\system32\rundll32.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\mspaint.exe N/A
N/A N/A C:\Windows\system32\mspaint.exe N/A
N/A N/A C:\Windows\system32\mspaint.exe N/A
N/A N/A C:\Windows\system32\mspaint.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1276 wrote to memory of 2200 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 1276 wrote to memory of 2200 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 1276 wrote to memory of 2200 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\rundll32.exe
PID 2200 wrote to memory of 2588 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\mspaint.exe
PID 2200 wrote to memory of 2588 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\mspaint.exe
PID 2200 wrote to memory of 2588 N/A C:\Windows\system32\rundll32.exe C:\Windows\system32\mspaint.exe

Processes

C:\Windows\system32\cmd.exe

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

C:\Windows\system32\rundll32.exe

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

C:\Windows\system32\mspaint.exe

"C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\cstealer.pyc"

C:\Program Files\VideoLAN\VLC\vlc.exe

"C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Desktop\WriteSync.3g2"

Network

N/A

Files

memory/2588-24-0x000007FEFAD90000-0x000007FEFADDC000-memory.dmp

memory/2588-25-0x000007FEFAD90000-0x000007FEFADDC000-memory.dmp

memory/2180-38-0x000000013FEB0000-0x000000013FFA8000-memory.dmp

memory/2180-39-0x000007FEF7C80000-0x000007FEF7CB4000-memory.dmp

memory/2180-40-0x000007FEF64B0000-0x000007FEF6766000-memory.dmp

memory/2180-41-0x000007FEF42E0000-0x000007FEF5390000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-03 23:30

Reported

2024-06-03 23:33

Platform

win10v2004-20240508-en

Max time kernel

138s

Max time network

127s

Command Line

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

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings C:\Windows\system32\cmd.exe N/A
Key created \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000_Classes\Local Settings C:\Windows\system32\OpenWith.exe N/A

Suspicious use of SetWindowsHookEx

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

Processes

C:\Windows\system32\cmd.exe

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

C:\Windows\system32\OpenWith.exe

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

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=3452,i,16710585221322798697,8586257254049248207,262144 --variations-seed-version --mojo-platform-channel-handle=4444 /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 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.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 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 101.58.20.217.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 8.8.8.8:53 26.35.223.20.in-addr.arpa udp

Files

N/A