Malware Analysis Report

2025-01-18 04:07

Sample ID 241031-hcj69stnek
Target Client-built.exe
SHA256 4cf9ad714c5b87300da61b54e8b3f2c7c8179834ca22f4df8a7fa75e7474d112
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

4cf9ad714c5b87300da61b54e8b3f2c7c8179834ca22f4df8a7fa75e7474d112

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

Enumerates physical storage devices

Unsigned PE

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-31 06:35

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

2024-10-31 06:35

Reported

2024-10-31 06:38

Platform

win10ltsc2021-20241023-en

Max time kernel

125s

Max time network

142s

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 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
N/A 10.127.0.200:4782 tcp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
N/A 10.127.0.200:4782 tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 fd.api.iris.microsoft.com udp
NL 20.103.156.88:443 fd.api.iris.microsoft.com tcp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
N/A 10.127.0.200:4782 tcp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
N/A 10.127.0.200:4782 tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
N/A 10.127.0.200:4782 tcp
N/A 10.127.0.200:4782 tcp

Files

memory/928-0-0x00007FFCF4243000-0x00007FFCF4245000-memory.dmp

memory/928-1-0x0000000000160000-0x0000000000484000-memory.dmp

memory/928-2-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

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

MD5 ab1979896105bac4ca36869f682ae4e6
SHA1 524c924cf54fc2cb271806fb812753664468d480
SHA256 4cf9ad714c5b87300da61b54e8b3f2c7c8179834ca22f4df8a7fa75e7474d112
SHA512 c3c87d91127a9e57cf9808775fe4306dbe0d41c969060246a60937ab04d630015ec7e9308ed164541705027a38118f3274b5851b9d95635052029cf6ade28a03

memory/928-5-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

memory/3476-6-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

memory/3476-7-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

memory/3476-8-0x000000001C920000-0x000000001C970000-memory.dmp

memory/3476-9-0x000000001CA30000-0x000000001CAE2000-memory.dmp

memory/3476-10-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp