Malware Analysis Report

2025-04-14 04:54

Sample ID 241213-lz3tnswqcl
Target Client-built.exe
SHA256 89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d
Tags
office04 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

89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar RAT

Quasar payload

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

Suspicious use of SendNotifyMessage

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

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 09:59

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

2024-12-13 09:59

Reported

2024-12-13 10:01

Platform

win7-20241010-en

Max time kernel

131s

Max time network

144s

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:\Users\Admin\AppData\Roaming\SubDir\Client.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:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp

Files

memory/432-0-0x000007FEF65A3000-0x000007FEF65A4000-memory.dmp

memory/432-1-0x0000000001270000-0x0000000001594000-memory.dmp

memory/432-2-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

MD5 6d6b0853a2aac3f0fe8403826e778cfd
SHA1 2a7d910997330b2e00555252603b725af6a9a8bb
SHA256 89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d
SHA512 2d1b1af0c174c85f0c0be5f946a71826c8d18489d7b6c8a8f8d09a9709f1669c232e270fbce945d04740c5cfabf46e17e17a291d263c537a04dda8932e40ec28

memory/2880-9-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

memory/432-8-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

memory/2880-10-0x0000000000EE0000-0x0000000001204000-memory.dmp

memory/2880-11-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

memory/2880-12-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-13 09:59

Reported

2024-12-13 10:01

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

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:\Users\Admin\AppData\Roaming\SubDir\Client.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:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
N/A 192.168.181.84:4782 tcp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
N/A 192.168.181.84:4782 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 8.8.8.8:53 107.12.20.2.in-addr.arpa udp
N/A 192.168.181.84:4782 tcp
US 8.8.8.8:53 24.125.209.23.in-addr.arpa udp
N/A 192.168.181.84:4782 tcp
US 8.8.8.8:53 25.125.209.23.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp
N/A 192.168.181.84:4782 tcp

Files

memory/1100-0-0x00007FFA102C3000-0x00007FFA102C5000-memory.dmp

memory/1100-1-0x0000000000E90000-0x00000000011B4000-memory.dmp

memory/1100-2-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

MD5 6d6b0853a2aac3f0fe8403826e778cfd
SHA1 2a7d910997330b2e00555252603b725af6a9a8bb
SHA256 89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d
SHA512 2d1b1af0c174c85f0c0be5f946a71826c8d18489d7b6c8a8f8d09a9709f1669c232e270fbce945d04740c5cfabf46e17e17a291d263c537a04dda8932e40ec28

memory/1100-9-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

memory/3356-10-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

memory/3356-11-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

memory/3356-12-0x000000001C080000-0x000000001C0D0000-memory.dmp

memory/3356-13-0x000000001C190000-0x000000001C242000-memory.dmp

memory/3356-14-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp