Malware Analysis Report

2025-01-18 04:06

Sample ID 241029-v8zm2swncx
Target Client-built.exe
SHA256 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
Tags
office04 quasar persistence 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

14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar persistence spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Adds Run key to start application

Unsigned PE

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-29 17:40

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

2024-10-29 17:40

Reported

2024-10-29 17:42

Platform

win7-20240903-en

Max time kernel

126s

Max time network

135s

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
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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" 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\Client-built.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\Client-built.exe

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

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "." /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 "." /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/2824-0-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

memory/2824-1-0x0000000000370000-0x0000000000694000-memory.dmp

memory/2824-2-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

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

MD5 c65338d7d892863734f74ee949cb7a16
SHA1 50151ab64046e04bc2e8d58c7c3bff0991299e9b
SHA256 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
SHA512 c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0

memory/2824-7-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

memory/2852-8-0x0000000001210000-0x0000000001534000-memory.dmp

memory/2852-9-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

memory/2852-10-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

memory/2852-11-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-29 17:40

Reported

2024-10-29 17:42

Platform

win10v2004-20241007-en

Max time kernel

150s

Max time network

152s

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" 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\Client-built.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\Client-built.exe

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

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "." /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 "." /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 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 150.171.28.10:443 g.bing.com tcp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 71.209.201.84.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 106.209.201.84.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp

Files

memory/4912-0-0x00007FFD9EAD3000-0x00007FFD9EAD5000-memory.dmp

memory/4912-1-0x0000000000370000-0x0000000000694000-memory.dmp

memory/4912-2-0x00007FFD9EAD0000-0x00007FFD9F591000-memory.dmp

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

MD5 c65338d7d892863734f74ee949cb7a16
SHA1 50151ab64046e04bc2e8d58c7c3bff0991299e9b
SHA256 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
SHA512 c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0

memory/1532-9-0x00007FFD9EAD0000-0x00007FFD9F591000-memory.dmp

memory/4912-8-0x00007FFD9EAD0000-0x00007FFD9F591000-memory.dmp

memory/1532-10-0x00007FFD9EAD0000-0x00007FFD9F591000-memory.dmp

memory/1532-11-0x0000000003080000-0x00000000030D0000-memory.dmp

memory/1532-12-0x000000001BFA0000-0x000000001C052000-memory.dmp

memory/1532-13-0x00007FFD9EAD0000-0x00007FFD9F591000-memory.dmp