Malware Analysis Report

2025-01-18 04:11

Sample ID 241103-c11ahavphn
Target 36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe
SHA256 36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291
Tags
quasar office04 discovery 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

36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291

Threat Level: Known bad

The file 36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe was found to be: Known bad.

Malicious Activity Summary

quasar office04 discovery spyware trojan

Quasar family

Quasar payload

Quasar RAT

Loads dropped DLL

Checks computer location settings

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of AdjustPrivilegeToken

Suspicious use of SendNotifyMessage

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

Suspicious use of FindShellTrayWindow

Scheduled Task/Job: Scheduled Task

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-03 02:33

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-03 02:33

Reported

2024-11-03 02:35

Platform

win7-20240903-en

Max time kernel

150s

Max time network

154s

Command Line

"C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.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\Local\Temp\Client-built.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.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 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

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 1680 wrote to memory of 2472 N/A C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe
PID 1680 wrote to memory of 2472 N/A C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe
PID 1680 wrote to memory of 2472 N/A C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe
PID 1680 wrote to memory of 2472 N/A C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe
PID 2472 wrote to memory of 2624 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2472 wrote to memory of 2624 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2472 wrote to memory of 2624 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\schtasks.exe
PID 2472 wrote to memory of 2688 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2472 wrote to memory of 2688 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2472 wrote to memory of 2688 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2688 wrote to memory of 2656 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2688 wrote to memory of 2656 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2688 wrote to memory of 2656 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe

"C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe"

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 "puttystart" /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 "puttystart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp
PL 83.168.110.87:4782 tcp

Files

memory/1680-0-0x0000000074E9E000-0x0000000074E9F000-memory.dmp

memory/1680-1-0x0000000001150000-0x00000000014A0000-memory.dmp

memory/1680-2-0x0000000074E90000-0x000000007557E000-memory.dmp

\Users\Admin\AppData\Local\Temp\Client-built.exe

MD5 e456f2449b504e6af29acb9c1e0ebd25
SHA1 4680b936eca2d5a88cbeed164b54a0b12f138892
SHA256 7ce80a4a4932516cf8163f73c85537e621b0a1e1a0c0fda41da1f71b1867dfc6
SHA512 ffe8788bae2143eb5b68f57edb3ded569bc1e75390bc48a7eb92e65a95688d34229039001d80f717f1c14e650fe94c01ec6e9438dac045af17569dc6811ab281

memory/1680-9-0x0000000074E90000-0x000000007557E000-memory.dmp

memory/2472-10-0x000007FEF6033000-0x000007FEF6034000-memory.dmp

memory/2472-11-0x0000000000A20000-0x0000000000D44000-memory.dmp

memory/2472-12-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

memory/2688-19-0x0000000000DE0000-0x0000000001104000-memory.dmp

memory/2472-18-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-03 02:33

Reported

2024-11-03 02:35

Platform

win10v2004-20241007-en

Max time kernel

141s

Max time network

138s

Command Line

"C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.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 FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A
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
N/A 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\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe

"C:\Users\Admin\AppData\Local\Temp\36c5e613a6f16466cfbea6b74f926cb9d357bf78e1e229d9f47f38e7b78a7291.exe"

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 "puttystart" /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 "puttystart" /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 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 74.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
PL 83.168.110.87:4782 tcp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 87.110.168.83.in-addr.arpa udp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
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

Files

memory/1840-0-0x0000000074CDE000-0x0000000074CDF000-memory.dmp

memory/1840-1-0x0000000000040000-0x0000000000390000-memory.dmp

memory/1840-2-0x0000000074CD0000-0x0000000075480000-memory.dmp

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

MD5 e456f2449b504e6af29acb9c1e0ebd25
SHA1 4680b936eca2d5a88cbeed164b54a0b12f138892
SHA256 7ce80a4a4932516cf8163f73c85537e621b0a1e1a0c0fda41da1f71b1867dfc6
SHA512 ffe8788bae2143eb5b68f57edb3ded569bc1e75390bc48a7eb92e65a95688d34229039001d80f717f1c14e650fe94c01ec6e9438dac045af17569dc6811ab281

memory/788-15-0x00007FF974783000-0x00007FF974785000-memory.dmp

memory/1840-16-0x0000000074CD0000-0x0000000075480000-memory.dmp

memory/788-17-0x00000000003C0000-0x00000000006E4000-memory.dmp

memory/788-18-0x00007FF974780000-0x00007FF975241000-memory.dmp

memory/788-25-0x00007FF974780000-0x00007FF975241000-memory.dmp

memory/2860-26-0x000000001C260000-0x000000001C2B0000-memory.dmp

memory/2860-27-0x000000001C370000-0x000000001C422000-memory.dmp

memory/2860-30-0x000000001C2F0000-0x000000001C302000-memory.dmp

memory/2860-31-0x000000001CE70000-0x000000001CEAC000-memory.dmp