Malware Analysis Report

2025-04-14 05:06

Sample ID 230123-rdj3bsde54
Target 1f8f68e7623630103601f6235e9c94a6.bin
SHA256 e51a6cc27a8e9f21f56404bcf479978db71825bd61ed6eaf4570b5d64edbe2a2
Tags
quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V6

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

e51a6cc27a8e9f21f56404bcf479978db71825bd61ed6eaf4570b5d64edbe2a2

Threat Level: Known bad

The file 1f8f68e7623630103601f6235e9c94a6.bin was found to be: Known bad.

Malicious Activity Summary

quasar office04 spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-01-23 14:04

Signatures

Quasar family

quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-01-23 14:04

Reported

2023-01-23 14:07

Platform

win7-20220812-en

Max time kernel

138s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.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
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

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\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1392 wrote to memory of 952 N/A C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe C:\Windows\system32\schtasks.exe
PID 1392 wrote to memory of 952 N/A C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe C:\Windows\system32\schtasks.exe
PID 1392 wrote to memory of 952 N/A C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe C:\Windows\system32\schtasks.exe
PID 1392 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 1392 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 1392 wrote to memory of 1688 N/A C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 1688 wrote to memory of 1348 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 1688 wrote to memory of 1348 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 1688 wrote to memory of 1348 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe

Processes

C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe

"C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.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
N/A 192.168.1.237:1290 tcp
N/A 192.168.1.237:1290 tcp
N/A 192.168.1.237:1290 tcp
N/A 192.168.1.237:1290 tcp
N/A 192.168.1.237:1290 tcp
N/A 192.168.1.237:1290 tcp

Files

memory/1392-54-0x0000000000D20000-0x0000000000DA4000-memory.dmp

memory/1392-55-0x000007FEFBA81000-0x000007FEFBA83000-memory.dmp

memory/952-56-0x0000000000000000-mapping.dmp

memory/1688-57-0x0000000000000000-mapping.dmp

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

MD5 1f8f68e7623630103601f6235e9c94a6
SHA1 3c32c376b1be12d1f9df117eb8435804548c02c8
SHA256 76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591
SHA512 c93ba03f50602919a8355334c1450fb9f57aeb432027e53c458195d7dfbdc3940d042e136eb3ace24cd76c1ffbd359be05582893fc0e53f5fe764c8c32fe6631

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

MD5 1f8f68e7623630103601f6235e9c94a6
SHA1 3c32c376b1be12d1f9df117eb8435804548c02c8
SHA256 76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591
SHA512 c93ba03f50602919a8355334c1450fb9f57aeb432027e53c458195d7dfbdc3940d042e136eb3ace24cd76c1ffbd359be05582893fc0e53f5fe764c8c32fe6631

memory/1688-60-0x0000000000BC0000-0x0000000000C44000-memory.dmp

memory/1348-62-0x0000000000000000-mapping.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-01-23 14:04

Reported

2023-01-23 14:07

Platform

win10v2004-20220812-en

Max time kernel

144s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.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
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

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\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

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

Processes

C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe

"C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591.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
N/A 192.168.1.237:1290 tcp
N/A 8.238.23.254:80 tcp
N/A 8.238.23.254:80 tcp
N/A 192.168.1.237:1290 tcp
N/A 51.116.253.170:443 tcp
N/A 93.184.221.240:80 tcp
N/A 93.184.221.240:80 tcp
N/A 93.184.221.240:80 tcp
N/A 192.168.1.237:1290 tcp
N/A 93.184.221.240:80 tcp
N/A 93.184.220.29:80 tcp
N/A 192.168.1.237:1290 tcp
N/A 93.184.221.240:80 tcp
N/A 192.168.1.237:1290 tcp
N/A 192.168.1.237:1290 tcp

Files

memory/4616-132-0x0000000000970000-0x00000000009F4000-memory.dmp

memory/4616-133-0x00007FFB54A80000-0x00007FFB55541000-memory.dmp

memory/4844-134-0x0000000000000000-mapping.dmp

memory/3788-135-0x0000000000000000-mapping.dmp

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

MD5 1f8f68e7623630103601f6235e9c94a6
SHA1 3c32c376b1be12d1f9df117eb8435804548c02c8
SHA256 76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591
SHA512 c93ba03f50602919a8355334c1450fb9f57aeb432027e53c458195d7dfbdc3940d042e136eb3ace24cd76c1ffbd359be05582893fc0e53f5fe764c8c32fe6631

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

MD5 1f8f68e7623630103601f6235e9c94a6
SHA1 3c32c376b1be12d1f9df117eb8435804548c02c8
SHA256 76257feb8d753a419e11bd0672eac3d236ac990d8ba8baf7ec44c5f1f3eac591
SHA512 c93ba03f50602919a8355334c1450fb9f57aeb432027e53c458195d7dfbdc3940d042e136eb3ace24cd76c1ffbd359be05582893fc0e53f5fe764c8c32fe6631

memory/4616-138-0x00007FFB54A80000-0x00007FFB55541000-memory.dmp

memory/3788-139-0x00007FFB54A80000-0x00007FFB55541000-memory.dmp

memory/4264-140-0x0000000000000000-mapping.dmp

memory/3788-141-0x000000001C910000-0x000000001C960000-memory.dmp

memory/3788-142-0x000000001CA20000-0x000000001CAD2000-memory.dmp

memory/3788-143-0x00007FFB54A80000-0x00007FFB55541000-memory.dmp