quasar | e358e8eff32f6c6ec1e95e04e0573023856c6e2625dd4b0aa28739a49c4f9e17

Analysis

max time kernel
1045s
max time network
1051s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08-01-2025 17:43

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

Client-built.exe
Size

3.1MB
MD5

b1c7e0c32b9e9daf61e6cafc7e983379
SHA1

3a6c799ce6fcf5d6c3e72ebabdc2ad37b1c7fcde
SHA256

e358e8eff32f6c6ec1e95e04e0573023856c6e2625dd4b0aa28739a49c4f9e17
SHA512

452a26a27327082764fb3d0b31412686e59429742a0ea6b7be4762d41e19abcc330c675a4fae143c295cd9796b9a612521c96244cef0442fa9ae4722c08dca20
SSDEEP

49152:rv3I22SsaNYfdPBldt698dBcjHWQxNESEyk/icLoGd9THHB72eh2NT:rv422SsaNYfdPBldt6+dBcjHpxRi

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

ubxn6j9dc.localto.net:2424

Mutex

7a517489-e7aa-4d3a-8bac-14c016a258fe

Attributes

encryption_key
A896862809BEA850DB21D754E127B53DD347664D
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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4080-1-0x0000000000C10000-0x0000000000F34000-memory.dmp	family_quasar
behavioral2/files/0x0031000000023b75-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4644	Client.exe

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 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2584	schtasks.exe
4248	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4080	Client-built.exe
Token: SeDebugPrivilege	4644	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4644	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4644	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4080 wrote to memory of 2584	4080	Client-built.exe	82
PID 4080 wrote to memory of 2584	4080	Client-built.exe	82
PID 4080 wrote to memory of 4644	4080	Client-built.exe	84
PID 4080 wrote to memory of 4644	4080	Client-built.exe	84
PID 4644 wrote to memory of 4248	4644	Client.exe	85
PID 4644 wrote to memory of 4248	4644	Client.exe	85

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:4080
- 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:2584
- 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 WriteProcessMemory
  PID:4644
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4248

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

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
b1c7e0c32b9e9daf61e6cafc7e983379

SHA1
3a6c799ce6fcf5d6c3e72ebabdc2ad37b1c7fcde

SHA256
e358e8eff32f6c6ec1e95e04e0573023856c6e2625dd4b0aa28739a49c4f9e17

SHA512
452a26a27327082764fb3d0b31412686e59429742a0ea6b7be4762d41e19abcc330c675a4fae143c295cd9796b9a612521c96244cef0442fa9ae4722c08dca20

Download Submit
memory/4080-0-0x00007FFF48353000-0x00007FFF48355000-memory.dmp

Filesize
8KB

Download
memory/4080-1-0x0000000000C10000-0x0000000000F34000-memory.dmp

Filesize
3.1MB

Download
memory/4080-2-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download
memory/4080-8-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download
memory/4644-9-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download
memory/4644-10-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download
memory/4644-11-0x000000001D7A0000-0x000000001D7F0000-memory.dmp

Filesize
320KB

Download
memory/4644-12-0x000000001D8B0000-0x000000001D962000-memory.dmp

Filesize
712KB

Download
memory/4644-13-0x00007FFF48350000-0x00007FFF48E11000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads