Malware Analysis Report

2024-10-19 08:41

Sample ID 240419-2f4jvsab4t
Target Client-built.exe
SHA256 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59

Threat Level: Known bad

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

Malicious Activity Summary

quasar office04 spyware trojan

Quasar family

Quasar RAT

Quasar payload

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Creates scheduled task(s)

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-19 22:32

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

2024-04-19 22:32

Reported

2024-04-19 22:42

Platform

win10v2004-20240412-en

Max time kernel

565s

Max time network

576s

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\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

Creates scheduled task(s)

persistence
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 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 "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 206.221.208.4.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.32.209.4.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 154.173.246.72.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 240.197.17.2.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 14.251.17.2.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 208.14.97.104.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 23.173.189.20.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 217.14.97.104.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
US 138.91.171.81:80 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp

Files

memory/1508-0-0x0000000000B90000-0x0000000000EB4000-memory.dmp

memory/1508-1-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

memory/1508-2-0x00000000030A0000-0x00000000030B0000-memory.dmp

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

MD5 491d53dcfb36c12d0077bbb926f24d02
SHA1 4e35320259495d99e3d9fbc03aeea39c93c3a051
SHA256 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
SHA512 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b

memory/1508-8-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

memory/3508-9-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

memory/3508-10-0x000000001B9B0000-0x000000001B9C0000-memory.dmp

memory/3508-11-0x000000001B9C0000-0x000000001BA10000-memory.dmp

memory/3508-12-0x000000001C320000-0x000000001C3D2000-memory.dmp

memory/3508-13-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

memory/3508-14-0x000000001B9B0000-0x000000001B9C0000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-04-19 22:32

Reported

2024-04-19 22:35

Platform

win11-20240412-en

Max time kernel

125s

Max time network

145s

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\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

Creates scheduled task(s)

persistence
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 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 "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
IE 52.111.236.23:443 tcp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp

Files

memory/2056-0-0x0000000000710000-0x0000000000A34000-memory.dmp

memory/2056-1-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp

memory/2056-2-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

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

MD5 491d53dcfb36c12d0077bbb926f24d02
SHA1 4e35320259495d99e3d9fbc03aeea39c93c3a051
SHA256 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
SHA512 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b

memory/3944-9-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp

memory/2056-8-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp

memory/3944-10-0x000000001BB70000-0x000000001BB80000-memory.dmp

memory/3944-11-0x000000001BAE0000-0x000000001BB30000-memory.dmp

memory/3944-12-0x000000001C4B0000-0x000000001C562000-memory.dmp

memory/3944-13-0x00007FF93BA50000-0x00007FF93C512000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-19 22:32

Reported

2024-04-19 22:35

Platform

win10-20240404-en

Max time kernel

150s

Max time network

140s

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\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

Creates scheduled task(s)

persistence
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 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 "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
IE 52.111.236.23:443 tcp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp
N/A 192.168.1.139:4782 tcp
US 8.8.8.8:53 14.173.189.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
N/A 192.168.1.139:4782 tcp

Files

memory/4392-0-0x0000000000350000-0x0000000000674000-memory.dmp

memory/4392-1-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp

memory/4392-2-0x0000000000F50000-0x0000000000F60000-memory.dmp

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

MD5 491d53dcfb36c12d0077bbb926f24d02
SHA1 4e35320259495d99e3d9fbc03aeea39c93c3a051
SHA256 97cd6ad3a56efc266ba1860e2d1c5958094b988be74bd36e9499d22fdaed9c59
SHA512 7f9a8134032cb437278422d7f0ea123e68146fc5f6f3de693592b96620669eb36696625235fddbebae0949e9ddbbd4d8f694c61f16489a38322d90149f70553b

memory/4392-8-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp

memory/804-9-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp

memory/804-10-0x000000001BC30000-0x000000001BC40000-memory.dmp

memory/804-11-0x000000001C300000-0x000000001C350000-memory.dmp

memory/804-12-0x000000001C410000-0x000000001C4C2000-memory.dmp

memory/804-13-0x00007FFDDF720000-0x00007FFDE010C000-memory.dmp

memory/804-14-0x000000001BC30000-0x000000001BC40000-memory.dmp