Malware Analysis Report

2025-01-18 04:28

Sample ID 231128-pwm6lahh9w
Target Client-built.exe
SHA256 fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
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

fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Loads dropped DLL

Looks up external IP address via web service

Unsigned PE

Suspicious use of SetWindowsHookEx

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-11-28 12:41

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

2023-11-28 12:40

Reported

2023-11-28 12:43

Platform

win7-20231020-en

Max time kernel

118s

Max time network

139s

Command Line

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

Loads dropped DLL

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

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A
N/A N/A C:\Windows\SysWOW64\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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2256 wrote to memory of 2824 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 2256 wrote to memory of 2824 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 2256 wrote to memory of 2824 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 2256 wrote to memory of 2824 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 2256 wrote to memory of 2740 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2256 wrote to memory of 2740 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2256 wrote to memory of 2740 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2256 wrote to memory of 2740 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2740 wrote to memory of 2836 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 2740 wrote to memory of 2836 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 2740 wrote to memory of 2836 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 2740 wrote to memory of 2836 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe

Processes

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

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

C:\Windows\SysWOW64\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f

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

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

C:\Windows\SysWOW64\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 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 208.95.112.1:80 ip-api.com tcp
VN 223.27.104.5:4782 tcp

Files

memory/2256-0-0x0000000001170000-0x00000000011CE000-memory.dmp

memory/2256-1-0x0000000074400000-0x0000000074AEE000-memory.dmp

memory/2256-2-0x00000000049D0000-0x0000000004A10000-memory.dmp

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

MD5 2207ba09525cf5c4b7b7e09359bd6118
SHA1 2c266c94899b4cb038e812ed1c067b47979399bd
SHA256 fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb

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

MD5 2207ba09525cf5c4b7b7e09359bd6118
SHA1 2c266c94899b4cb038e812ed1c067b47979399bd
SHA256 fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb

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

MD5 2207ba09525cf5c4b7b7e09359bd6118
SHA1 2c266c94899b4cb038e812ed1c067b47979399bd
SHA256 fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb

memory/2256-9-0x0000000074400000-0x0000000074AEE000-memory.dmp

memory/2740-11-0x0000000001270000-0x00000000012CE000-memory.dmp

memory/2740-10-0x0000000074400000-0x0000000074AEE000-memory.dmp

memory/2740-12-0x0000000001210000-0x0000000001250000-memory.dmp

memory/2740-14-0x0000000074400000-0x0000000074AEE000-memory.dmp

memory/2740-15-0x0000000001210000-0x0000000001250000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-11-28 12:40

Reported

2023-11-28 12:43

Platform

win10v2004-20231127-en

Max time kernel

143s

Max time network

148s

Command Line

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

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A
N/A N/A C:\Windows\SysWOW64\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

Processes

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

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

C:\Windows\SysWOW64\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f

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

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

C:\Windows\SysWOW64\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 39.142.81.104.in-addr.arpa udp
US 8.8.8.8:53 68.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 1.112.95.208.in-addr.arpa udp
US 208.95.112.1:80 ip-api.com tcp
VN 223.27.104.5:4782 tcp
US 8.8.8.8:53 5.104.27.223.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 1.202.248.87.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 23.173.189.20.in-addr.arpa udp

Files

memory/856-0-0x0000000000EB0000-0x0000000000F0E000-memory.dmp

memory/856-1-0x00000000745C0000-0x0000000074D70000-memory.dmp

memory/856-2-0x0000000005EF0000-0x0000000006494000-memory.dmp

memory/856-3-0x00000000059E0000-0x0000000005A72000-memory.dmp

memory/856-4-0x00000000058D0000-0x00000000058E0000-memory.dmp

memory/856-5-0x0000000005B80000-0x0000000005BE6000-memory.dmp

memory/856-6-0x0000000006720000-0x0000000006732000-memory.dmp

memory/856-7-0x0000000006B60000-0x0000000006B9C000-memory.dmp

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

MD5 2207ba09525cf5c4b7b7e09359bd6118
SHA1 2c266c94899b4cb038e812ed1c067b47979399bd
SHA256 fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb

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

MD5 2207ba09525cf5c4b7b7e09359bd6118
SHA1 2c266c94899b4cb038e812ed1c067b47979399bd
SHA256 fe00b66746e04dc422da7033d22c5c4f516a41713de90c61580d4e4ec30469ed
SHA512 628a46802656589b4b90285b927756f9855718487bc317b194304d751cf9b8262fa1f9c805ae5b194b4f279f17ef02b4cab370a6e728aef8f6bb992d3a6eadeb

memory/404-13-0x00000000745C0000-0x0000000074D70000-memory.dmp

memory/856-14-0x00000000745C0000-0x0000000074D70000-memory.dmp

memory/404-15-0x0000000004F50000-0x0000000004F60000-memory.dmp

memory/404-17-0x0000000006700000-0x000000000670A000-memory.dmp

memory/404-18-0x00000000745C0000-0x0000000074D70000-memory.dmp

memory/404-19-0x0000000004F50000-0x0000000004F60000-memory.dmp