Malware Analysis Report

2024-10-19 08:41

Sample ID 240418-1tra1sha2t
Target Client-built.exe
SHA256 a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840
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

a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840

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

Drops file in System32 directory

Unsigned PE

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-18 21:56

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

2024-04-18 21:56

Reported

2024-04-18 21:57

Platform

win7-20240319-en

Max time kernel

32s

Max time network

27s

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

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\SubDir\updale.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\SubDir\updale.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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 340 wrote to memory of 1716 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 340 wrote to memory of 1716 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 340 wrote to memory of 1716 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe

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 "windows av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f

C:\Windows\explorer.exe

"C:\Windows\explorer.exe"

Network

N/A

Files

memory/340-0-0x0000000000860000-0x0000000000B84000-memory.dmp

memory/340-1-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

memory/340-2-0x0000000000300000-0x0000000000380000-memory.dmp

memory/340-4-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

memory/340-5-0x0000000000300000-0x0000000000380000-memory.dmp