Malware Analysis Report

2025-04-13 11:54

Sample ID 240818-z7241avepd
Target Client-built.exe
SHA256 d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0
Tags
skids quasar spyware trojan
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

d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0

Threat Level: Known bad

The file Client-built.exe was found to be: Known bad.

Malicious Activity Summary

skids quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Suspicious use of FindShellTrayWindow

Scheduled Task/Job: Scheduled Task

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of SendNotifyMessage

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-18 21:22

Signatures

Quasar family

quasar

Quasar payload

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

2024-08-18 21:22

Reported

2024-08-18 21:25

Platform

win7-20240705-en

Max time kernel

128s

Max time network

141s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Executes dropped EXE

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

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\Windows\Windows Host Process.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Windows\system32\Windows\Windows Host Process.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A
N/A N/A C:\Windows\system32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\system32\Windows\Windows Host Process.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

C:\Windows\system32\Windows\Windows Host Process.exe

"C:\Windows\system32\Windows\Windows Host Process.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp

Files

memory/3016-0-0x000007FEF4E23000-0x000007FEF4E24000-memory.dmp

memory/3016-1-0x00000000013D0000-0x0000000001728000-memory.dmp

memory/3016-2-0x000007FEF4E20000-0x000007FEF580C000-memory.dmp

C:\Windows\System32\Windows\Windows Host Process.exe

MD5 9eb8732b560208f0380c386771aba096
SHA1 d2ae1ff6755e79f97485aea27912ed7710378b08
SHA256 d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0
SHA512 686b1968a19d6f81562df6efd659060ecc7d2eceb7b053d530e8bcba030db6e7b55cb7c6364d6dddc7ea9a46b5004cae3a78db5b432ed279ce2fa854fa400b8a

memory/2800-10-0x0000000000350000-0x00000000006A8000-memory.dmp

memory/2800-9-0x000007FEF4E20000-0x000007FEF580C000-memory.dmp

memory/3016-8-0x000007FEF4E20000-0x000007FEF580C000-memory.dmp

memory/2800-11-0x000007FEF4E20000-0x000007FEF580C000-memory.dmp

memory/2800-12-0x000007FEF4E20000-0x000007FEF580C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-18 21:22

Reported

2024-08-18 21:25

Platform

win10v2004-20240802-en

Max time kernel

147s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Executes dropped EXE

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

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\Windows\Windows Host Process.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Windows\system32\Windows\Windows Host Process.exe N/A
File created C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\system32\Windows\Windows Host Process.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

C:\Windows\system32\Windows\Windows Host Process.exe

"C:\Windows\system32\Windows\Windows Host Process.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 75.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 ipwho.is udp
US 8.8.8.8:53 22.221.185.147.in-addr.arpa udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 34.56.20.217.in-addr.arpa udp
US 8.8.8.8:53 25.140.123.92.in-addr.arpa udp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp

Files

memory/2932-0-0x00007FF88A013000-0x00007FF88A015000-memory.dmp

memory/2932-1-0x0000000000060000-0x00000000003B8000-memory.dmp

memory/2932-2-0x00007FF88A010000-0x00007FF88AAD1000-memory.dmp

C:\Windows\System32\Windows\Windows Host Process.exe

MD5 9eb8732b560208f0380c386771aba096
SHA1 d2ae1ff6755e79f97485aea27912ed7710378b08
SHA256 d00477c11f3c8ad73a0ea9c3c4b7e549754ed63b645a3a8f57de6dd2f89ec8d0
SHA512 686b1968a19d6f81562df6efd659060ecc7d2eceb7b053d530e8bcba030db6e7b55cb7c6364d6dddc7ea9a46b5004cae3a78db5b432ed279ce2fa854fa400b8a

memory/3008-9-0x00007FF88A010000-0x00007FF88AAD1000-memory.dmp

memory/3008-10-0x00007FF88A010000-0x00007FF88AAD1000-memory.dmp

memory/3008-11-0x000000001C090000-0x000000001C0E0000-memory.dmp

memory/3008-12-0x000000001C1A0000-0x000000001C252000-memory.dmp

memory/3008-15-0x000000001C120000-0x000000001C132000-memory.dmp

memory/3008-16-0x000000001C8A0000-0x000000001C8DC000-memory.dmp

memory/2932-17-0x00007FF88A010000-0x00007FF88AAD1000-memory.dmp

memory/3008-18-0x00007FF88A010000-0x00007FF88AAD1000-memory.dmp

memory/3008-19-0x000000001CCE0000-0x000000001CE89000-memory.dmp