Malware Analysis Report

2024-10-19 08:41

Sample ID 240419-2hxt4aab8y
Target Client-builttttt.exe
SHA256 33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7
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

33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar payload

Quasar RAT

Quasar family

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

Creates scheduled task(s)

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-19 22:35

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

2024-04-19 22:35

Reported

2024-04-19 22:36

Platform

win11-20240412-en

Max time kernel

27s

Max time network

20s

Command Line

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

"C:\Users\Admin\AppData\Local\Temp\Client-builttttt.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 127.0.0.1:4782 tcp

Files

memory/1440-0-0x0000000000060000-0x0000000000384000-memory.dmp

memory/1440-1-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

memory/1440-2-0x000000001B110000-0x000000001B120000-memory.dmp

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

MD5 6008b1f40ce25519bacd9a12f89755df
SHA1 e38e22911d1baebae439caf4d5556143927e3a02
SHA256 33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7
SHA512 133aea39eb9617aa968c33add336304a1b1796ba1945db7ad7b6748d3463e77dbb405ff3755f4dc1f6d3de37eec870d9b01c3dcbaa0ff399f02e86174ec5a2ce

memory/1440-9-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

memory/4960-8-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

memory/4960-10-0x000000001BBB0000-0x000000001BBC0000-memory.dmp

memory/4960-11-0x000000001C740000-0x000000001C790000-memory.dmp

memory/4960-12-0x000000001C850000-0x000000001C902000-memory.dmp

memory/4960-13-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

memory/4960-14-0x000000001BBB0000-0x000000001BBC0000-memory.dmp