Malware Analysis Report

2025-01-18 04:07

Sample ID 241029-v6ng1aymek
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 payload

Quasar family

Quasar RAT

Executes dropped EXE

Adds Run key to start application

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-29 17:36

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 17:36

Reported

2024-10-29 17:38

Platform

win7-20240903-en

Max time kernel

150s

Max time network

136s

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-1-5-21-4177215427-74451935-3209572229-1000\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-1-5-21-4177215427-74451935-3209572229-1000\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
N/A 192.168.1.28:4782 tcp

Files

memory/1692-0-0x000007FEF5F83000-0x000007FEF5F84000-memory.dmp

memory/1692-1-0x00000000013E0000-0x0000000001704000-memory.dmp

memory/1692-2-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

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

MD5 c65338d7d892863734f74ee949cb7a16
SHA1 50151ab64046e04bc2e8d58c7c3bff0991299e9b
SHA256 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
SHA512 c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0

memory/2552-9-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2552-8-0x0000000000160000-0x0000000000484000-memory.dmp

memory/2552-10-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/1692-7-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

memory/2552-11-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-29 17:36

Reported

2024-10-29 17:38

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

150s

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 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 73.190.18.2.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
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp

Files

memory/2464-0-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

memory/2464-1-0x0000000000110000-0x0000000000434000-memory.dmp

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

MD5 c65338d7d892863734f74ee949cb7a16
SHA1 50151ab64046e04bc2e8d58c7c3bff0991299e9b
SHA256 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
SHA512 c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0

memory/2464-7-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

memory/3964-8-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

memory/3964-9-0x000000001BEC0000-0x000000001BF10000-memory.dmp

memory/3964-10-0x000000001C700000-0x000000001C7B2000-memory.dmp

memory/3964-11-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp