Malware Analysis Report

2025-01-18 04:08

Sample ID 241105-e4a6wsxkdk
Target Client-built.exe
SHA256 d2422e4e839fa1da5bdb80a4762ba07c26c6134eb9f00e691894ec5312024c83
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

d2422e4e839fa1da5bdb80a4762ba07c26c6134eb9f00e691894ec5312024c83

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

Unsigned PE

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of FindShellTrayWindow

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-05 04:29

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

2024-11-05 04:29

Reported

2024-11-05 04:46

Platform

win10ltsc2021-20241023-en

Max time kernel

1034s

Max time network

1050s

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:\Users\Admin\AppData\Roaming\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:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

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
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
N/A 10.127.1.127:4782 tcp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
N/A 10.127.1.127:4782 tcp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
N/A 10.127.1.127:4782 tcp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
US 8.8.8.8:53 28.173.189.20.in-addr.arpa udp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp
N/A 10.127.1.127:4782 tcp

Files

memory/764-0-0x00007FFB80023000-0x00007FFB80025000-memory.dmp

memory/764-1-0x00000000002F0000-0x0000000000614000-memory.dmp

memory/764-2-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

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

MD5 fef7fc18a56919307292dad1b0481e8e
SHA1 1b4cc3b74a2c5c43cad76cf12f7b03dafe6dad3a
SHA256 d2422e4e839fa1da5bdb80a4762ba07c26c6134eb9f00e691894ec5312024c83
SHA512 6fd9b368c64364b28e35a972fe5dc25f3afc3ce13ab4bb8764c9a80018bf97b1c6e13b2026750dc5dc08909a3f7054b85c5d23ef59217489f1d7807e3132e568

memory/764-5-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

memory/924-6-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

memory/924-7-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

memory/924-8-0x000000001C440000-0x000000001C490000-memory.dmp

memory/924-9-0x000000001C550000-0x000000001C602000-memory.dmp

memory/924-10-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp