Malware Analysis Report

2025-01-18 04:28

Sample ID 231201-mj55jaha95
Target client-2.exe
SHA256 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
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

7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4

Threat Level: Known bad

The file client-2.exe was found to be: Known bad.

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Enumerates physical storage devices

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Suspicious use of SendNotifyMessage

Suspicious use of FindShellTrayWindow

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-12-01 10:30

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

2023-12-01 10:30

Reported

2023-12-01 10:33

Platform

win7-20231023-en

Max time kernel

117s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\client-2.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
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-2.exe N/A
File opened for modification C:\Windows\system32\SubDir\Client.exe C:\Users\Admin\AppData\Local\Temp\client-2.exe N/A

Enumerates physical storage devices

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-2.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-2.exe

"C:\Users\Admin\AppData\Local\Temp\client-2.exe"

C:\Windows\system32\schtasks.exe

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

Network

Country Destination Domain Proto
N/A 127.0.0.1:7777 tcp

Files

memory/2696-0-0x0000000001250000-0x0000000001574000-memory.dmp

memory/2696-1-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

memory/2696-2-0x0000000000260000-0x00000000002E0000-memory.dmp

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

MD5 cac610eeae60d8291a852ad9dda90c81
SHA1 d97afeabdc465c60ba040becfbc5abde19ec9326
SHA256 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
SHA512 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

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

MD5 cac610eeae60d8291a852ad9dda90c81
SHA1 d97afeabdc465c60ba040becfbc5abde19ec9326
SHA256 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
SHA512 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

memory/2728-7-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

memory/2696-8-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

memory/2728-9-0x00000000003B0000-0x00000000006D4000-memory.dmp

memory/2728-10-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp

memory/2728-11-0x000000001B600000-0x000000001B680000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-01 10:30

Reported

2023-12-01 10:33

Platform

win10v2004-20231127-en

Max time kernel

150s

Max time network

155s

Command Line

"C:\Users\Admin\AppData\Local\Temp\client-2.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\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-2.exe N/A
File opened for modification C:\Windows\system32\SubDir\Client.exe C:\Users\Admin\AppData\Local\Temp\client-2.exe N/A

Enumerates physical storage devices

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-2.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-2.exe

"C:\Users\Admin\AppData\Local\Temp\client-2.exe"

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
N/A 127.0.0.1:7777 tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 8.173.189.20.in-addr.arpa udp
US 8.8.8.8:53 107.175.53.84.in-addr.arpa udp
US 8.8.8.8:53 14.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 68.159.190.20.in-addr.arpa udp

Files

memory/4112-0-0x0000000000D40000-0x0000000001064000-memory.dmp

memory/4112-1-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp

memory/4112-2-0x0000000003450000-0x0000000003460000-memory.dmp

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

MD5 cac610eeae60d8291a852ad9dda90c81
SHA1 d97afeabdc465c60ba040becfbc5abde19ec9326
SHA256 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
SHA512 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

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

MD5 cac610eeae60d8291a852ad9dda90c81
SHA1 d97afeabdc465c60ba040becfbc5abde19ec9326
SHA256 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
SHA512 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5

memory/2972-8-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp

memory/2972-9-0x000000001B280000-0x000000001B290000-memory.dmp

memory/2972-10-0x000000001D7C0000-0x000000001D810000-memory.dmp

memory/2972-11-0x000000001D8D0000-0x000000001D982000-memory.dmp

memory/4112-12-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp

memory/2972-13-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp

memory/2972-14-0x000000001B280000-0x000000001B290000-memory.dmp