Malware Analysis Report

2025-01-18 04:16

Sample ID 240108-n5vflaabh2
Target Client.exe
SHA256 8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c
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

8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar RAT

Quasar payload

Quasar family

Executes dropped EXE

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-01-08 11:59

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 11:59

Reported

2024-01-08 12:02

Platform

win7-20231215-en

Max time kernel

134s

Max time network

164s

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 s4.v100.vip udp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp

Files

memory/2476-1-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

memory/2476-0-0x0000000001240000-0x0000000001564000-memory.dmp

memory/2476-2-0x000000001B260000-0x000000001B2E0000-memory.dmp

memory/2476-7-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

memory/1704-9-0x0000000000360000-0x0000000000684000-memory.dmp

memory/1704-8-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

memory/1704-10-0x000000001AB90000-0x000000001AC10000-memory.dmp

memory/1704-11-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

memory/1704-12-0x000000001AB90000-0x000000001AC10000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-08 11:59

Reported

2024-01-08 12:02

Platform

win10v2004-20231215-en

Max time kernel

153s

Max time network

166s

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 138.91.171.81:80 tcp
US 8.8.8.8:53 147.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 s4.v100.vip udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 134.71.91.104.in-addr.arpa udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
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
US 92.123.241.104:80 tcp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 178.178.17.96.in-addr.arpa udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 174.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 udp
US 92.123.241.104:80 tcp
US 8.8.8.8:53 udp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 8.8.8.8:53 udp
GB 96.17.178.174:80 tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
GB 96.17.178.174:80 tcp
GB 96.17.178.174:80 tcp
GB 96.17.178.174:80 tcp
GB 96.17.178.174:80 tcp
US 8.8.8.8:53 udp
US 8.8.8.8:53 udp
US 192.229.221.95:80 tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 udp

Files

memory/4976-0-0x0000000000630000-0x0000000000954000-memory.dmp

memory/4976-2-0x000000001B780000-0x000000001B790000-memory.dmp

memory/4976-1-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

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

MD5 baf55b95da4a601229647f25dad12878
SHA1 abc16954ebfd213733c4493fc1910164d825cac8
SHA256 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
SHA512 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

memory/4976-10-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

memory/3912-11-0x000000001B560000-0x000000001B570000-memory.dmp

memory/3912-9-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

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

MD5 379dba3ccd9f0cf1bbf0be8e4c0f5b17
SHA1 a627b49c6a4c44df8c38e1814c9e73f2256479c2
SHA256 6a345b8019c0d9f3783addf793ac867781ca0990e1a7b29f32db90d970934bca
SHA512 20e6f85d2a174182834561c1effefea008d0aedc4d66efe49fbaef67b928064768e825e78a171e6f755082b2b3661ed20bdc39bf4e493392771f5f46a2ccc899

memory/3912-12-0x0000000002AA0000-0x0000000002AF0000-memory.dmp

memory/3912-13-0x000000001BC30000-0x000000001BCE2000-memory.dmp

memory/3912-14-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

memory/3912-15-0x000000001B560000-0x000000001B570000-memory.dmp