Malware Analysis Report

2024-10-19 08:35

Sample ID 240731-3gh5zstfnc
Target b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62
SHA256 b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62
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

b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62

Threat Level: Known bad

The file b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62 was found to be: Known bad.

Malicious Activity Summary

office04 quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Scheduled Task/Job: Scheduled Task

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-31 23:29

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

2024-07-31 23:29

Reported

2024-07-31 23:31

Platform

win7-20240708-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.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

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\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.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 2928 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe C:\Windows\system32\schtasks.exe
PID 2928 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe C:\Windows\system32\schtasks.exe
PID 2928 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe C:\Windows\system32\schtasks.exe
PID 2928 wrote to memory of 2724 N/A C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2928 wrote to memory of 2724 N/A C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2928 wrote to memory of 2724 N/A C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 2724 wrote to memory of 2664 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2724 wrote to memory of 2664 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\system32\schtasks.exe
PID 2724 wrote to memory of 2664 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\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe

"C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "BootstrapperV1.11" /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 "BootstrapperV1.11" /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/2928-0-0x000007FEF5B93000-0x000007FEF5B94000-memory.dmp

memory/2928-1-0x0000000001380000-0x00000000016A4000-memory.dmp

memory/2928-2-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

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

MD5 7c57eda4bef5b6a6f5ca084dde31deb7
SHA1 8ed5f1f48691e8d3d5e910b1fd46d0ce0d30eb1e
SHA256 b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62
SHA512 22d5be1c470f673b7a89ccb972c9b907eb76a070246d071550d891d52d2e4eba2a14df6924b98e1d866ad216e02e3a7cc368f545a578dfe6eaffec461abefe5d

memory/2724-7-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2928-9-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2724-8-0x00000000012A0000-0x00000000015C4000-memory.dmp

memory/2724-10-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2724-11-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-31 23:29

Reported

2024-07-31 23:31

Platform

win10v2004-20240730-en

Max time kernel

150s

Max time network

141s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.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

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\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.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\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe

"C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "BootstrapperV1.11" /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 "BootstrapperV1.11" /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 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 58.99.105.20.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
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/1212-1-0x0000000000C30000-0x0000000000F54000-memory.dmp

memory/1212-0-0x00007FFCE9D83000-0x00007FFCE9D85000-memory.dmp

memory/1212-2-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

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

MD5 7c57eda4bef5b6a6f5ca084dde31deb7
SHA1 8ed5f1f48691e8d3d5e910b1fd46d0ce0d30eb1e
SHA256 b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62
SHA512 22d5be1c470f673b7a89ccb972c9b907eb76a070246d071550d891d52d2e4eba2a14df6924b98e1d866ad216e02e3a7cc368f545a578dfe6eaffec461abefe5d

memory/1212-9-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

memory/4224-8-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

memory/4224-10-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

memory/4224-11-0x000000001C630000-0x000000001C680000-memory.dmp

memory/4224-12-0x000000001C740000-0x000000001C7F2000-memory.dmp

memory/4224-13-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp