Malware Analysis Report

2024-11-13 15:21

Sample ID 240731-vfcyksydna
Target source_prepared.pyc
SHA256 64e3d2880a27d913b02d026f5f227ed0875d265eef0139b5e5a6749632f013da
Tags
pysilon discovery
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

64e3d2880a27d913b02d026f5f227ed0875d265eef0139b5e5a6749632f013da

Threat Level: Known bad

The file source_prepared.pyc was found to be: Known bad.

Malicious Activity Summary

pysilon discovery

Detect Pysilon

Pysilon family

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

Modifies registry class

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-31 16:55

Signatures

Detect Pysilon

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

Pysilon family

pysilon

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-31 16:55

Reported

2024-07-31 16:58

Platform

win7-20240705-en

Max time kernel

121s

Max time network

126s

Command Line

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

Signatures

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\pyc_auto_file\shell\Read\command C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\pyc_auto_file\shell\Read\command\ = "\"C:\\Program Files (x86)\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\" \"%1\"" C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\pyc_auto_file\ C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\.pyc C:\Windows\system32\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\.pyc\ = "pyc_auto_file" C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\pyc_auto_file\shell\Read C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\pyc_auto_file\shell C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_Classes\Local Settings C:\Windows\system32\rundll32.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3502430532-24693940-2469786940-1000_CLASSES\pyc_auto_file C:\Windows\system32\rundll32.exe N/A

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe N/A
N/A N/A C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe N/A

Processes

C:\Windows\system32\cmd.exe

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

C:\Windows\system32\rundll32.exe

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

C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe

"C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\source_prepared.pyc"

Network

N/A

Files

C:\Users\Admin\AppData\Roaming\Adobe\Acrobat\9.0\SharedDataEvents

MD5 6aed38e53fa10c9f491df210982ecd3f
SHA1 a7be72b2943bfbac13b549b15bca0da8ac63e73b
SHA256 02bbaa85697e1d6918cc05c6d1ad921c862f97defec134f23930741e56c605a9
SHA512 b5274c90f41fb82fd5f274b86875cf566ee02086f6bfeb5f5f6fd41011b45218c37ca2c59f102c75b36c7d1a688ea9af9a0e9a450ff90e85c3b88fc5a3f78fa9

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-31 16:55

Reported

2024-07-31 16:58

Platform

win10v2004-20240730-en

Max time kernel

149s

Max time network

150s

Command Line

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

Signatures

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2927035347-1736702767-189270196-1000_Classes\Local Settings C:\Windows\system32\cmd.exe N/A
Key created \REGISTRY\USER\S-1-5-21-2927035347-1736702767-189270196-1000_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\source_prepared.pyc

C:\Windows\system32\OpenWith.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 3.181.190.20.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 88.238.56.23.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

N/A