quasar | aa3170ce6b4bbd9960ac0ccd60f7d0b39cc0d28254bfe73545b540cbd8444b21 | Triage™

Analysis

max time kernel
1800s
max time network
1806s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
15/10/2024, 01:26

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
Client-built.exe
Size 3.1MB
Sample241015-btmkds1arr
SHA256 aa3170ce6b4bbd9960ac0ccd60f7d0b39cc0d28254bfe73545b540cbd8444b21
MD5 e35d832888fda0fd705386a4b94ecc49
SHA1 86380c3eea496c7947c25c547748cfeed51c4de9
SHA512 60d6aec705948474fa007dad26fdba9b92dcb1098aefb4eed2898af7b048729e4a3ee5af7e7b9ca9e555b97b54f6d97007dfc1531d0abb9e5da01b5911c5fd63
SSDEEP 49152:Av4lL26AaNeWgPhlmVqvMQ7XSKNEREuY4oGdPwTHHB72eh2NT:AvQL26AaNeWgPhlmVqkQ7XSKmREuT
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

HomoThugger-36407.portmap.host:36407

Mutex

42d6f4c0-e8fc-473a-b92d-ded3fb29334a

Attributes

encryption_key
3CDA48FEB25557C87485A9F37CDC861398BEA3C7
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/2516-1-0x00000000002F0000-0x0000000000614000-memory.dmp	family_quasar

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
2448	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2516	Client-built.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2516	Client-built.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2516	Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 2448	2516	Client-built.exe	30
PID 2516 wrote to memory of 2448	2516	Client-built.exe	30
PID 2516 wrote to memory of 2448	2516	Client-built.exe	30

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2516
- 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
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2448

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/2516-0-0x000007FEF5E73000-0x000007FEF5E74000-memory.dmp

Download

memory/2516-1-0x00000000002F0000-0x0000000000614000-memory.dmp

Download

memory/2516-2-0x000007FEF5E70000-0x000007FEF685C000-memory.dmp

Download

memory/2516-3-0x000007FEF5E73000-0x000007FEF5E74000-memory.dmp

Download

memory/2516-4-0x000007FEF5E70000-0x000007FEF685C000-memory.dmp

Download