Malware Analysis Report

2025-01-18 04:35

Sample ID 240108-lsr4lafdcq
Target Client.exe
SHA256 d7a8958c5fde707a0943fb7021e254fd142fb434f4d9b7fcd03f1857ddfeeea9
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

d7a8958c5fde707a0943fb7021e254fd142fb434f4d9b7fcd03f1857ddfeeea9

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Unsigned PE

Creates scheduled task(s)

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-01-08 09:48

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

2024-01-08 09:48

Reported

2024-01-08 09:50

Platform

win7-20231215-en

Max time kernel

149s

Max time network

150s

Command Line

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

Executes dropped EXE

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

Creates scheduled task(s)

persistence
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.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\Client.exe

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

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 192.168.0.145:4782 tcp
N/A 192.168.0.145:4782 tcp
N/A 192.168.0.145:4782 tcp
N/A 192.168.0.145:4782 tcp
N/A 192.168.0.145:4782 tcp
N/A 192.168.0.145:4782 tcp
N/A 192.168.0.145:4782 tcp

Files

memory/1564-0-0x0000000000BC0000-0x0000000000EE4000-memory.dmp

memory/1564-1-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp

memory/1564-2-0x000000001B1B0000-0x000000001B230000-memory.dmp

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

MD5 48326c4d7f7305cd367d69c61593db38
SHA1 731b05943fba78cd161d50ae2b9f50392aff12d1
SHA256 ebf8d5fd18e458810280879cc1e782b9b0180083049301939060f21c55f2abfe
SHA512 d3e6ae47d10345eae1fe32237d50a467cd4a62e5f27708de8183b3506cba20a404bf83bf3573d97c193c03fe545004c130c86c0a65e5502f062c6d8aae3697ab

memory/2372-9-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp

memory/2372-10-0x000000001B3F0000-0x000000001B470000-memory.dmp

memory/2372-8-0x00000000009F0000-0x0000000000D14000-memory.dmp

memory/1564-7-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp

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

MD5 bfb70f6b45d4239bda6c60afb185c415
SHA1 99a8ed14889cd4c594bc9ff0e6be09b2abb63d74
SHA256 be456c09857247d734e975107e8522bf09bba7833e13ecff434db231e44a1e6a
SHA512 7dd523b21a1558847e6262b34389ba53ee0b55816e92f79c8539b0f8037c52a69ea19af4b0bd21d3187000124032168c2c8fdf9e19248945355651294f2ed0d8

memory/2372-11-0x000007FEF5300000-0x000007FEF5CEC000-memory.dmp

memory/2372-12-0x000000001B3F0000-0x000000001B470000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-08 09:48

Reported

2024-01-08 09:51

Platform

win10v2004-20231215-en

Max time kernel

156s

Max time network

171s

Command Line

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

Creates scheduled task(s)

persistence
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.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\Client.exe

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

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 22.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 114.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 134.71.91.104.in-addr.arpa udp
N/A 192.168.0.145:4782 tcp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
N/A 192.168.0.145:4782 tcp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
N/A 192.168.0.145:4782 tcp
US 8.8.8.8:53 18.173.189.20.in-addr.arpa udp
N/A 192.168.0.145:4782 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
N/A 192.168.0.145:4782 tcp

Files

memory/3988-0-0x0000000000160000-0x0000000000484000-memory.dmp

memory/3988-1-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp

memory/3988-2-0x000000001B010000-0x000000001B020000-memory.dmp

memory/3988-3-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp

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

MD5 228e6dce6f5770e966b7e2be915aec8b
SHA1 96886116cd9472d6cffb38ff90567c4cf5b4f608
SHA256 d7a8958c5fde707a0943fb7021e254fd142fb434f4d9b7fcd03f1857ddfeeea9
SHA512 5f75ac6af421291df9dade1edc4969b584b1264e6cfb027f58a23c199e4f82b98a24f21cbc755cd7f0d16ea4291160765c49e651c95273f891f79c419076fd6d

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log

MD5 baf55b95da4a601229647f25dad12878
SHA1 abc16954ebfd213733c4493fc1910164d825cac8
SHA256 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
SHA512 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

memory/3800-10-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp

memory/3988-11-0x000000001B010000-0x000000001B020000-memory.dmp

memory/3800-12-0x0000000002C70000-0x0000000002C80000-memory.dmp

memory/3988-13-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp

memory/3800-14-0x000000001C080000-0x000000001C0D0000-memory.dmp

memory/3800-15-0x000000001C190000-0x000000001C242000-memory.dmp

memory/3800-16-0x00007FF99DF60000-0x00007FF99EA21000-memory.dmp