Malware Analysis Report

2025-04-14 04:54

Sample ID 241214-lnqpzazlek
Target Client-built.exe
SHA256 b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6
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

b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Drops file in Program Files directory

Enumerates physical storage devices

Unsigned PE

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

Suspicious use of SendNotifyMessage

Scheduled Task/Job: Scheduled Task

Suspicious use of FindShellTrayWindow

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-14 09:41

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

2024-12-14 09:41

Reported

2024-12-14 09:42

Platform

win10v2004-20241007-en

Max time kernel

30s

Max time network

31s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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:\Program Files\SubDir\Client.exe N/A

Drops file in Program Files directory

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

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
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:\Program Files\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Program Files\SubDir\Client.exe N/A
N/A N/A C:\Program Files\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Program Files\SubDir\Client.exe N/A
N/A N/A C:\Program Files\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:\Program Files\SubDir\Client.exe" /rl HIGHEST /f

C:\Program Files\SubDir\Client.exe

"C:\Program Files\SubDir\Client.exe"

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 Waix-40247.portmap.host udp
DE 193.161.193.99:40247 Waix-40247.portmap.host tcp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 99.193.161.193.in-addr.arpa udp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp

Files

memory/4896-0-0x00007FFD4F463000-0x00007FFD4F465000-memory.dmp

memory/4896-1-0x00000000003D0000-0x00000000006F4000-memory.dmp

memory/4896-2-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

C:\Program Files\SubDir\Client.exe

MD5 5d941424d5ea2bcacc9205837acc1dff
SHA1 dad94e588db27fb9afabce3831f2bf4f6ed1e8f2
SHA256 b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6
SHA512 f3ef395430ccb27ab7fbac3b8b120aac0d93ac605b09862bfa3085005e9e241e6deee3def80ed7d6c8ae7a1c46c93400ad97f0049e5f79aefb05e65a82d1dab4

memory/3596-9-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

memory/4896-10-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

memory/3596-11-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

memory/3596-12-0x000000001C200000-0x000000001C250000-memory.dmp

memory/3596-13-0x000000001C310000-0x000000001C3C2000-memory.dmp

memory/3596-14-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

memory/3596-17-0x000000001C250000-0x000000001C262000-memory.dmp

memory/3596-18-0x000000001C2B0000-0x000000001C2EC000-memory.dmp