Malware Analysis Report

2025-01-18 04:31

Sample ID 231229-pnpdpadffj
Target Client-built.exe
SHA256 118be55a76743e05e33251b51cad97c46de6ba3fe7090ad65dc3a5400f45979d
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 Overview

score
10/10

SHA256

118be55a76743e05e33251b51cad97c46de6ba3fe7090ad65dc3a5400f45979d

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar payload

Quasar family

Quasar RAT

Executes dropped EXE

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-12-29 12:28

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

2023-12-29 12:28

Reported

2023-12-29 12:31

Platform

win10v2004-20231215-en

Max time kernel

139s

Max time network

159s

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\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-built.exe N/A
Token: SeDebugPrivilege 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-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.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 23.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.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 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.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
N/A 192.168.178.197:4782 tcp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
N/A 192.168.178.197:4782 tcp
US 8.8.8.8:53 177.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
N/A 192.168.178.197:4782 tcp
US 8.8.8.8:53 210.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
N/A 192.168.178.197:4782 tcp
US 8.8.8.8:53 58.99.105.20.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
N/A 192.168.178.197:4782 tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 24.73.42.20.in-addr.arpa udp

Files

memory/3192-0-0x0000000000E20000-0x0000000001144000-memory.dmp

memory/3192-1-0x00007FFCA7B20000-0x00007FFCA85E1000-memory.dmp

memory/3192-2-0x000000001BCA0000-0x000000001BCB0000-memory.dmp

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

MD5 8024af6152ce6dc1c65c57b9e2c88017
SHA1 b3683f398f36b35d4e1ed5af789521a1aa07c11c
SHA256 118be55a76743e05e33251b51cad97c46de6ba3fe7090ad65dc3a5400f45979d
SHA512 e28089ca4cec5f79f3ce7770e424535e891a4eb1cb0b8de204083d4c7b4791be4e33b55b746fd22fd7d1597ebb2f90e5fb75c91641aebe5fe2f352afb9080791

memory/5032-9-0x00007FFCA7B20000-0x00007FFCA85E1000-memory.dmp

memory/5032-10-0x000000001B960000-0x000000001B970000-memory.dmp

memory/3192-11-0x00007FFCA7B20000-0x00007FFCA85E1000-memory.dmp

memory/5032-12-0x000000001B8F0000-0x000000001B940000-memory.dmp

memory/5032-13-0x000000001BF30000-0x000000001BFE2000-memory.dmp

memory/5032-14-0x00007FFCA7B20000-0x00007FFCA85E1000-memory.dmp

memory/5032-15-0x000000001B960000-0x000000001B970000-memory.dmp