Malware Analysis Report

2024-10-19 08:35

Sample ID 240731-3xcyxazeqp
Target Client-built.exe
SHA256 76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c
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

76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c

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

Unsigned PE

Uses Task Scheduler COM API

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-31 23:53

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 23:53

Reported

2024-07-31 23:55

Platform

win7-20240729-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 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\BootstrapperV1.11.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\BootstrapperV1.11.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.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 "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe

"C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.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/2336-0-0x000007FEF6063000-0x000007FEF6064000-memory.dmp

memory/2336-1-0x00000000002A0000-0x00000000005C4000-memory.dmp

memory/2336-2-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe

MD5 b45a77a2cdaca1dbaf0ebeec34178a95
SHA1 4b43a29635df7b060ec3c7696c45446bf37c8150
SHA256 76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c
SHA512 cdfbe90b1ad02b69a5bfcb577d1cd8c12d055df2e370716d0faccf65364edecf5c8103f55355daa11a8d845a24d453b78c6e49f06242043ffa1a0a9d8e7d052d

memory/3056-10-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

memory/3056-9-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

memory/2336-8-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

memory/3056-7-0x0000000000110000-0x0000000000434000-memory.dmp

memory/3056-11-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-31 23:53

Reported

2024-07-31 23:55

Platform

win10v2004-20240730-en

Max time kernel

126s

Max time network

143s

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.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\BootstrapperV1.11.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.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 "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe

"C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.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 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
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 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 147.142.123.92.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
N/A 192.168.1.28:4782 tcp
N/A 192.168.1.28:4782 tcp

Files

memory/3412-0-0x00007FFA02D43000-0x00007FFA02D45000-memory.dmp

memory/3412-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp

memory/3412-2-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\BootstrapperV1.11.exe

MD5 b45a77a2cdaca1dbaf0ebeec34178a95
SHA1 4b43a29635df7b060ec3c7696c45446bf37c8150
SHA256 76ba8ec8222df3a96263d57d284c0acd8f62a604e2a46e86e8a5b46d6018607c
SHA512 cdfbe90b1ad02b69a5bfcb577d1cd8c12d055df2e370716d0faccf65364edecf5c8103f55355daa11a8d845a24d453b78c6e49f06242043ffa1a0a9d8e7d052d

memory/2112-8-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

memory/3412-9-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

memory/2112-10-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp

memory/2112-11-0x000000001BBC0000-0x000000001BC10000-memory.dmp

memory/2112-12-0x000000001BCD0000-0x000000001BD82000-memory.dmp

memory/2112-13-0x00007FFA02D40000-0x00007FFA03801000-memory.dmp