Malware Analysis Report

2025-01-18 04:11

Sample ID 241102-nvcssswlcr
Target Client-built.exe
SHA256 3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887
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

3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887

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 SetWindowsHookEx

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-02 11:42

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

2024-11-02 11:42

Reported

2024-11-02 11:45

Platform

win10v2004-20241007-en

Max time kernel

139s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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\Client-built.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-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

C:\Windows\System32\rundll32.exe

C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
N/A 192.168.0.102:4782 tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
N/A 192.168.0.102:4782 tcp
US 8.8.8.8:53 212.20.149.52.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 110.11.19.2.in-addr.arpa udp
N/A 192.168.0.102:4782 tcp
US 8.8.8.8:53 73.209.201.84.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
N/A 192.168.0.102:4782 tcp
N/A 192.168.0.102:4782 tcp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
N/A 192.168.0.102:4782 tcp

Files

memory/988-0-0x00007FFCC7303000-0x00007FFCC7305000-memory.dmp

memory/988-1-0x0000000000A80000-0x0000000000DA4000-memory.dmp

memory/988-2-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

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

MD5 96dbf079644fad007ddee4a898bdb096
SHA1 3eec62ed768ce4a1181f00a0dd6cca3564e1f9f1
SHA256 3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887
SHA512 356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385

memory/988-9-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

memory/428-10-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

memory/428-11-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

memory/428-12-0x000000001C190000-0x000000001C1E0000-memory.dmp

memory/428-13-0x000000001C2A0000-0x000000001C352000-memory.dmp

memory/428-14-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

memory/428-15-0x000000001CBD0000-0x000000001D0F8000-memory.dmp