Malware Analysis Report

2024-10-19 08:41

Sample ID 240422-gtxm9agg3s
Target Client-built.exe
SHA256 1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb
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 Overview

score
10/10

SHA256

1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb

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 payload

Quasar RAT

Executes dropped EXE

Unsigned PE

Uses Task Scheduler COM API

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-22 06:06

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

2024-04-22 06:06

Reported

2024-04-22 06:09

Platform

win10-20240404-en

Max time kernel

149s

Max time network

135s

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:\Users\Admin\AppData\Roaming\SubDir\Client.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:\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 192.168.40.129:4782 tcp
N/A 192.168.40.129:4782 tcp
N/A 192.168.40.129:4782 tcp
N/A 192.168.40.129:4782 tcp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
N/A 192.168.40.129:4782 tcp
N/A 192.168.40.129:4782 tcp
US 8.8.8.8:53 10.173.189.20.in-addr.arpa udp
N/A 192.168.40.129:4782 tcp

Files

memory/3508-0-0x0000000000EB0000-0x00000000011D4000-memory.dmp

memory/3508-1-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

memory/3508-2-0x000000001BF00000-0x000000001BF10000-memory.dmp

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

MD5 41de983b173011ea0f81bc18257927ea
SHA1 48b40eadc6eca603b8adc15bc38a0b5b9450e56a
SHA256 1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb
SHA512 4efe78911125a02dea2a1e5112ae5869773b95862a104c9a97b4953a9a723898a56638f25cbb8508219896ffee9d5ae5d15d9dd1eb8790c2f28bfea1209a3525

memory/3508-10-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

memory/4832-9-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

memory/4832-11-0x000000001B1E0000-0x000000001B1F0000-memory.dmp

memory/4832-12-0x000000001B960000-0x000000001B9B0000-memory.dmp

memory/4832-13-0x000000001BA70000-0x000000001BB22000-memory.dmp

memory/4832-14-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

memory/4832-15-0x000000001B1E0000-0x000000001B1F0000-memory.dmp