Malware Analysis Report

2025-01-03 06:16

Sample ID 241123-rv2npswpfs
Target Realtek.exe
SHA256 3cf37367797ad61761ab44b22ec80c206d31411a604106d061be6935787b8110
Tags
stormkitty persistence stealer
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

3cf37367797ad61761ab44b22ec80c206d31411a604106d061be6935787b8110

Threat Level: Known bad

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

Malicious Activity Summary

stormkitty persistence stealer

StormKitty payload

Stormkitty family

Contains code to disable Windows Defender

StormKitty

Adds Run key to start application

Looks up external IP address via web service

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-23 14:31

Signatures

Contains code to disable Windows Defender

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

StormKitty payload

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

Stormkitty family

stormkitty

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-23 14:31

Reported

2024-11-23 14:34

Platform

win7-20241010-en

Max time kernel

122s

Max time network

126s

Command Line

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

Signatures

Contains code to disable Windows Defender

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

StormKitty

stealer stormkitty

StormKitty payload

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

Stormkitty family

stormkitty

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\nvidiaDValueOn = "C:\\Users\\Admin\\AppData\\Local\\NVIDIA Local Drivers\\DriversUpdateProcess_x64.exe" C:\Users\Admin\AppData\Local\Temp\Realtek.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A checkip.dyndns.org N/A N/A

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2088 wrote to memory of 3008 N/A C:\Users\Admin\AppData\Local\Temp\Realtek.exe C:\Windows\system32\WerFault.exe
PID 2088 wrote to memory of 3008 N/A C:\Users\Admin\AppData\Local\Temp\Realtek.exe C:\Windows\system32\WerFault.exe
PID 2088 wrote to memory of 3008 N/A C:\Users\Admin\AppData\Local\Temp\Realtek.exe C:\Windows\system32\WerFault.exe

Processes

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

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

C:\Windows\system32\WerFault.exe

C:\Windows\system32\WerFault.exe -u -p 2088 -s 1068

Network

Country Destination Domain Proto
US 8.8.8.8:53 checkip.dyndns.org udp
BR 132.226.247.73:80 checkip.dyndns.org tcp

Files

memory/2088-0-0x000007FEF5F63000-0x000007FEF5F64000-memory.dmp

memory/2088-1-0x00000000000D0000-0x00000000000E8000-memory.dmp

memory/2088-2-0x000007FEF5F60000-0x000007FEF694C000-memory.dmp

memory/2088-5-0x000007FEF5F63000-0x000007FEF5F64000-memory.dmp

memory/2088-6-0x000007FEF5F60000-0x000007FEF694C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-23 14:31

Reported

2024-11-23 14:34

Platform

win10v2004-20241007-en

Max time kernel

145s

Max time network

146s

Command Line

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

Signatures

Contains code to disable Windows Defender

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

StormKitty

stealer stormkitty

StormKitty payload

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

Stormkitty family

stormkitty

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\nvidiaDValueOn = "C:\\Users\\Admin\\AppData\\Local\\NVIDIA Local Drivers\\DriversUpdateProcess_x64.exe" C:\Users\Admin\AppData\Local\Temp\Realtek.exe N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A checkip.dyndns.org N/A N/A

Suspicious use of AdjustPrivilegeToken

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

Processes

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 checkip.dyndns.org udp
US 193.122.130.0:80 checkip.dyndns.org tcp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 0.130.122.193.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 241.42.69.40.in-addr.arpa udp
US 8.8.8.8:53 10.24.18.2.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 24.73.42.20.in-addr.arpa udp

Files

memory/3856-0-0x00007FFFD6ED3000-0x00007FFFD6ED5000-memory.dmp

memory/3856-1-0x00000000003A0000-0x00000000003B8000-memory.dmp

memory/3856-2-0x00007FFFD6ED0000-0x00007FFFD7991000-memory.dmp

memory/3856-5-0x00007FFFD6ED0000-0x00007FFFD7991000-memory.dmp