Malware Analysis Report

2025-04-13 11:57

Sample ID 240818-12w68sxdmb
Target Client-built.exe
SHA256 7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa
Tags
ran 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

7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa

Threat Level: Known bad

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

Malicious Activity Summary

ran quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Scheduled Task/Job: Scheduled Task

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-18 22:09

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 22:09

Reported

2024-08-18 22:11

Platform

win7-20240705-en

Max time kernel

149s

Max time network

147s

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 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
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

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 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp

Files

memory/1984-0-0x000007FEF6543000-0x000007FEF6544000-memory.dmp

memory/1984-1-0x0000000001280000-0x00000000015E6000-memory.dmp

memory/1984-2-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

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

MD5 58587e08cc617fb97526bfbac57b62e8
SHA1 bd38f26aa6541b07a510d0a064b5c7235c9c8a5b
SHA256 7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa
SHA512 b0ecdbe15b1fd4d2e190c285c14d1e454e9192105698f0d89952999a13b2b238128326eaf243e29c13c8d1c1e8372c7b6d735c92374921e2740fdd91d91da525

memory/1984-8-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

memory/1376-11-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

memory/1376-10-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

memory/1376-9-0x00000000010D0000-0x0000000001436000-memory.dmp

memory/1376-12-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-18 22:09

Reported

2024-08-18 22:23

Platform

win10v2004-20240802-en

Max time kernel

444s

Max time network

445s

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 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
File opened for modification 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
Token: SeCreateGlobalPrivilege N/A C:\Windows\system32\dwm.exe N/A
Token: SeChangeNotifyPrivilege N/A C:\Windows\system32\dwm.exe N/A
Token: 33 N/A C:\Windows\system32\dwm.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\system32\dwm.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

C:\Windows\system32\dwm.exe

"dwm.exe"

C:\Windows\system32\sihost.exe

sihost.exe

C:\Windows\system32\sihost.exe

sihost.exe

C:\Windows\system32\dwm.exe

"dwm.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 25.140.123.92.in-addr.arpa udp
US 8.8.8.8:53 134.32.126.40.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 22.221.185.147.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 ipwho.is 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 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 28.73.42.20.in-addr.arpa udp

Files

memory/1740-0-0x00007FFDDF7D3000-0x00007FFDDF7D5000-memory.dmp

memory/1740-1-0x0000000000170000-0x00000000004D6000-memory.dmp

memory/1740-2-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp

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

MD5 58587e08cc617fb97526bfbac57b62e8
SHA1 bd38f26aa6541b07a510d0a064b5c7235c9c8a5b
SHA256 7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa
SHA512 b0ecdbe15b1fd4d2e190c285c14d1e454e9192105698f0d89952999a13b2b238128326eaf243e29c13c8d1c1e8372c7b6d735c92374921e2740fdd91d91da525

memory/5052-9-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp

memory/1740-10-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp

memory/5052-11-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp

memory/5052-12-0x000000001C2F0000-0x000000001C340000-memory.dmp

memory/5052-13-0x000000001C400000-0x000000001C4B2000-memory.dmp

memory/5052-16-0x000000001C340000-0x000000001C352000-memory.dmp

memory/5052-17-0x000000001C3A0000-0x000000001C3DC000-memory.dmp

memory/5052-18-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp

memory/5052-19-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp

memory/5052-21-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp