quasar | a8a97fe89cfb912227c5e40cc288fcd816b52c273d160843db984e9e51bb6667

Analysis

max time kernel
134s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
13-05-2024 19:55

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

Client-built.exe
Size

3.1MB
MD5

4b7c599b895a9fa0dda7e55d9c13376d
SHA1

4c8b7e05cfe4b53ea335db96931c8031c6ceebdb
SHA256

a8a97fe89cfb912227c5e40cc288fcd816b52c273d160843db984e9e51bb6667
SHA512

7fb7c6cb49cbd7fdf4436c74c108d5438c37ddf505252fe9aea18549672a9f48d1987fe9396d1c16b20258ff353805cf96f7aa5b2a0ad2c63b8745e3afcb76e3
SSDEEP

49152:rvylL26AaNeWgPhlmVqvMQ7XSKJkYC1JrBoGdq/THHB72eh2NT:rvqL26AaNeWgPhlmVqkQ7XSKJkYY

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.100.213:4782

26.129.198.185:4782

Mutex

cf7698f7-6984-4327-a3ad-0cf3f7a5f85c

Attributes

encryption_key
B84D867DF2B37D5B2F9AC9A779D84549AFC6AD79
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 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2660-1-0x0000000000B00000-0x0000000000E24000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

3436 Client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

5056 schtasks.exe
5028 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2660 Client-built.exe
Token: SeDebugPrivilege 3436 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

3436 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

3436 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

3436 Client.exe

pid	process
3436	Client.exe

pid	process
5056	schtasks.exe
5028	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2660	Client-built.exe
Token: SeDebugPrivilege	3436	Client.exe

pid	process
3436	Client.exe

pid	process
3436	Client.exe

pid	process
3436	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2660 wrote to memory of 5056	2660	Client-built.exe	schtasks.exe
PID 2660 wrote to memory of 5056	2660	Client-built.exe	schtasks.exe
PID 2660 wrote to memory of 3436	2660	Client-built.exe	Client.exe
PID 2660 wrote to memory of 3436	2660	Client-built.exe	Client.exe
PID 3436 wrote to memory of 5028	3436	Client.exe	schtasks.exe
PID 3436 wrote to memory of 5028	3436	Client.exe	schtasks.exe

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 WriteProcessMemory
PID:2660

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⤵
- Creates scheduled task(s)
PID:5056

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3436

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
3⤵
- Creates scheduled task(s)
PID:5028

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
4b7c599b895a9fa0dda7e55d9c13376d

SHA1
4c8b7e05cfe4b53ea335db96931c8031c6ceebdb

SHA256
a8a97fe89cfb912227c5e40cc288fcd816b52c273d160843db984e9e51bb6667

SHA512
7fb7c6cb49cbd7fdf4436c74c108d5438c37ddf505252fe9aea18549672a9f48d1987fe9396d1c16b20258ff353805cf96f7aa5b2a0ad2c63b8745e3afcb76e3

Download Submit
memory/2660-0-0x00007FF947473000-0x00007FF947475000-memory.dmp

Filesize
8KB

Download
memory/2660-1-0x0000000000B00000-0x0000000000E24000-memory.dmp

Filesize
3.1MB

Download
memory/2660-2-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/2660-8-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/3436-9-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/3436-10-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/3436-11-0x000000001C710000-0x000000001C760000-memory.dmp

Filesize
320KB

Download
memory/3436-12-0x000000001C820000-0x000000001C8D2000-memory.dmp

Filesize
712KB

Download
memory/3436-13-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download