Malware Analysis Report

2025-04-14 04:54

Sample ID 241213-l1nq5svkgy
Target Client-built.exe
SHA256 fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee
Tags
quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee

Threat Level: Known bad

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

Malicious Activity Summary

quasar office04 spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Drops file in System32 directory

Enumerates physical storage devices

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SendNotifyMessage

Suspicious use of FindShellTrayWindow

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-13 10:00

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: behavioral2

Detonation Overview

Submitted

2024-12-13 10:00

Reported

2024-12-13 10:02

Platform

win10v2004-20241007-en

Max time kernel

126s

Max time network

150s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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\SubDir\Client.exe N/A

Drops file in System32 directory

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

Enumerates physical storage devices

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\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.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 "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f

C:\Windows\system32\SubDir\Client.exe

"C:\Windows\system32\SubDir\Client.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 69.160.242.105:4782 tcp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 69.160.242.105:11066 tcp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 69.160.242.105:4782 tcp
US 8.8.8.8:53 133.130.81.91.in-addr.arpa udp
US 69.160.242.105:11066 tcp
US 69.160.242.105:4782 tcp
US 69.160.242.105:11066 tcp

Files

memory/1316-0-0x00007FFC72ED3000-0x00007FFC72ED5000-memory.dmp

memory/1316-1-0x0000000000F10000-0x0000000000F94000-memory.dmp

memory/1316-2-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

C:\Windows\System32\SubDir\Client.exe

MD5 05aa0a6d16f1dabf72b4c880a5d357d0
SHA1 4a3ebaa010ba5306cd09c07eb26bbe99ff46496f
SHA256 fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee
SHA512 931a147bf27a8a14db99b8f6480dddfa2bd1e0b4aaa59092552ef93e9f93adddbcb71d7d9c7a1f45f7854e32d16555dc7f3be701a2df9578a9e99349e972758a

memory/3468-8-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

memory/1316-10-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

memory/3468-9-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

memory/3468-11-0x000000001BCA0000-0x000000001BCF0000-memory.dmp

memory/3468-12-0x000000001BDB0000-0x000000001BE62000-memory.dmp

memory/3468-13-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-13 10:00

Reported

2024-12-13 10:02

Platform

win7-20240903-en

Max time kernel

126s

Max time network

135s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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\SubDir\Client.exe N/A

Drops file in System32 directory

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

Enumerates physical storage devices

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\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\SubDir\Client.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 "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f

C:\Windows\system32\SubDir\Client.exe

"C:\Windows\system32\SubDir\Client.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 69.160.242.105:4782 tcp
US 69.160.242.105:11066 tcp
US 69.160.242.105:4782 tcp
US 69.160.242.105:11066 tcp
US 69.160.242.105:4782 tcp
US 69.160.242.105:11066 tcp

Files

memory/2104-0-0x000007FEF5A23000-0x000007FEF5A24000-memory.dmp

memory/2104-1-0x0000000000EC0000-0x0000000000F44000-memory.dmp

memory/2104-2-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

C:\Windows\System32\SubDir\Client.exe

MD5 05aa0a6d16f1dabf72b4c880a5d357d0
SHA1 4a3ebaa010ba5306cd09c07eb26bbe99ff46496f
SHA256 fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee
SHA512 931a147bf27a8a14db99b8f6480dddfa2bd1e0b4aaa59092552ef93e9f93adddbcb71d7d9c7a1f45f7854e32d16555dc7f3be701a2df9578a9e99349e972758a

memory/2648-8-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

memory/2648-7-0x0000000000CD0000-0x0000000000D54000-memory.dmp

memory/2648-9-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

memory/2104-10-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

memory/2648-11-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp

memory/2648-12-0x000007FEF5A20000-0x000007FEF640C000-memory.dmp