Malware Analysis Report

2024-10-19 08:36

Sample ID 240728-xs4m6syhnr
Target Loader.exe
SHA256 342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0
Tags
quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0

Threat Level: Known bad

The file Loader.exe was found to be: Known bad.

Malicious Activity Summary

quasar office04 spyware trojan

Quasar payload

Quasar RAT

Quasar family

Executes dropped EXE

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-28 19:07

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: behavioral2

Detonation Overview

Submitted

2024-07-28 19:07

Reported

2024-07-28 19:11

Platform

win10v2004-20240709-en

Max time kernel

149s

Max time network

154s

Command Line

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

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

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /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 "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 25.140.123.92.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
N/A 192.168.1.51:4782 tcp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 38.58.20.217.in-addr.arpa udp
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 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 150.171.28.10:443 tse1.mm.bing.net tcp
N/A 192.168.1.51:4782 tcp
US 8.8.8.8:53 67.112.168.52.in-addr.arpa udp

Files

memory/2948-0-0x00007FFC7FD73000-0x00007FFC7FD75000-memory.dmp

memory/2948-1-0x0000000000440000-0x0000000000764000-memory.dmp

memory/2948-2-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

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

MD5 6c0cfc9686b74302e726ddcc3252740e
SHA1 a588ad7e2398448a1587576b1f90c9c59bcd78fc
SHA256 342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0
SHA512 1e9ae56b2ee6bef507cfd3137616b1ea0ffb98c4e0bd5fdf429fb77d5c6ee475ee9d22edacdc883dd7e0bd2b2b6c0e13c43a55f8cf3c84b229a98f42fa1acc02

memory/4716-10-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

memory/2948-9-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

memory/4716-11-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

memory/4716-12-0x000000001B700000-0x000000001B750000-memory.dmp

memory/4716-13-0x000000001C090000-0x000000001C142000-memory.dmp

memory/4716-14-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

memory/4716-15-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-28 19:07

Reported

2024-07-28 19:11

Platform

win7-20240708-en

Max time kernel

131s

Max time network

144s

Command Line

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

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

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 tcp
N/A 192.168.1.51:4782 tcp

Files

memory/2356-0-0x000007FEF5B93000-0x000007FEF5B94000-memory.dmp

memory/2356-1-0x0000000000990000-0x0000000000CB4000-memory.dmp

memory/2356-2-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

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

MD5 6c0cfc9686b74302e726ddcc3252740e
SHA1 a588ad7e2398448a1587576b1f90c9c59bcd78fc
SHA256 342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0
SHA512 1e9ae56b2ee6bef507cfd3137616b1ea0ffb98c4e0bd5fdf429fb77d5c6ee475ee9d22edacdc883dd7e0bd2b2b6c0e13c43a55f8cf3c84b229a98f42fa1acc02

memory/2156-8-0x0000000001040000-0x0000000001364000-memory.dmp

memory/2156-9-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2156-10-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2356-11-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2156-12-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp

memory/2156-13-0x000007FEF5B90000-0x000007FEF657C000-memory.dmp