Malware Analysis Report

2025-01-18 04:11

Sample ID 241030-n2cflstqfl
Target rezprivwoofer.7z
SHA256 6be1cae3cc032014e34c3a79e24aafd051639b807db79ea56d493d9203c2ac89
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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

6be1cae3cc032014e34c3a79e24aafd051639b807db79ea56d493d9203c2ac89

Threat Level: Known bad

The file rezprivwoofer.7z was found to be: Known bad.

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar RAT

Quasar payload

Executes dropped EXE

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-30 11:53

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

2024-10-30 11:53

Reported

2024-10-30 11:56

Platform

win7-20240903-en

Max time kernel

127s

Max time network

138s

Command Line

"C:\Users\Admin\AppData\Local\Temp\rezprivwoofer\TempWoofpriv.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
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

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\rezprivwoofer\TempWoofpriv.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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\rezprivwoofer\TempWoofpriv.exe

"C:\Users\Admin\AppData\Local\Temp\rezprivwoofer\TempWoofpriv.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
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp

Files

memory/2260-0-0x000007FEF6163000-0x000007FEF6164000-memory.dmp

memory/2260-1-0x0000000000B10000-0x0000000000E34000-memory.dmp

memory/2260-2-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

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

MD5 b9aee7a92f002f80a6b04c252b05bb29
SHA1 4e186ba6d401d5e45627ac789d3cf22d19698b8c
SHA256 72f27c509e27de2edbe9d98fa9258624260d3cabd7b9932636dceb610180d7ef
SHA512 b3f899e279c6f72cb8517160b747bcd44339909b61a82e4304d1e29e9e5da9506acdde8531d25ed3a3506781743c74427437dcfc6981bc992fdb5d83652cb6cd

memory/2852-9-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

memory/2852-8-0x0000000000380000-0x00000000006A4000-memory.dmp

memory/2260-7-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

memory/2852-10-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

memory/2852-11-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-30 11:53

Reported

2024-10-30 11:54

Platform

win10v2004-20241007-en

Max time kernel

26s

Max time network

23s

Command Line

"C:\Users\Admin\AppData\Local\Temp\rezprivwoofer\TempWoofpriv.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

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\rezprivwoofer\TempWoofpriv.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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\rezprivwoofer\TempWoofpriv.exe

"C:\Users\Admin\AppData\Local\Temp\rezprivwoofer\TempWoofpriv.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 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp

Files

memory/1060-0-0x00007FFFFDBF3000-0x00007FFFFDBF5000-memory.dmp

memory/1060-1-0x0000000000130000-0x0000000000454000-memory.dmp

memory/1060-2-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp

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

MD5 b9aee7a92f002f80a6b04c252b05bb29
SHA1 4e186ba6d401d5e45627ac789d3cf22d19698b8c
SHA256 72f27c509e27de2edbe9d98fa9258624260d3cabd7b9932636dceb610180d7ef
SHA512 b3f899e279c6f72cb8517160b747bcd44339909b61a82e4304d1e29e9e5da9506acdde8531d25ed3a3506781743c74427437dcfc6981bc992fdb5d83652cb6cd

memory/1060-8-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp

memory/1868-9-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp

memory/1868-10-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp

memory/1868-11-0x000000001BC30000-0x000000001BC80000-memory.dmp

memory/1868-12-0x000000001C470000-0x000000001C522000-memory.dmp

memory/1868-13-0x00007FFFFDBF0000-0x00007FFFFE6B1000-memory.dmp