quasar | 4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9

Analysis

max time kernel
149s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
02-10-2024 01:15

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe
Size

3.1MB
MD5

641cb02c429feb106094750765d0d6af
SHA1

db5be32e7ef7c5e93b7ef4f06bd6854f3a393cbd
SHA256

4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9
SHA512

8c4baa95d860c22e0ede96da48136db417f61ec6b19fccb847d0317f775e77d1e299f80e2f19230055fabf9e91ec8dbb2d90b055ddeb75b4c714c971afbf37b9
SSDEEP

49152:TIMa8I9WtxU/Pom7ZlHMgK+YISxoJXFacCbG1JoQoGdLTHHB72eh2NT:TI38I9WtxU/Pom7ZlHMg8ISxoJXEcC4

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

39.102.36.209:4782

Mutex

6d2ccfb9-4bf8-4a23-933c-5674d8e6fac2

Attributes

encryption_key
F48794CF898BB4C5B6223D4F472D7C5E4AD2EF9D
install_name
Clienty.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

resource	yara_rule
behavioral2/memory/3728-1-0x00000000001D0000-0x00000000004F4000-memory.dmp	family_quasar
behavioral2/files/0x00070000000234c0-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4876	Clienty.exe

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
3744	schtasks.exe
2244	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3728	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe
Token: SeDebugPrivilege	4876	Clienty.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4876	Clienty.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3728 wrote to memory of 3744	3728	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	83
PID 3728 wrote to memory of 3744	3728	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	83
PID 3728 wrote to memory of 4876	3728	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	85
PID 3728 wrote to memory of 4876	3728	4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe	85
PID 4876 wrote to memory of 2244	4876	Clienty.exe	86
PID 4876 wrote to memory of 2244	4876	Clienty.exe	86

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\4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe
"C:\Users\Admin\AppData\Local\Temp\4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3728
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3744
- C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4876
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Clienty.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2244

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
641cb02c429feb106094750765d0d6af

SHA1
db5be32e7ef7c5e93b7ef4f06bd6854f3a393cbd

SHA256
4a04da4d657c3c6bc45ea42cfef67039cd51173159ce7b707467f69146e086f9

SHA512
8c4baa95d860c22e0ede96da48136db417f61ec6b19fccb847d0317f775e77d1e299f80e2f19230055fabf9e91ec8dbb2d90b055ddeb75b4c714c971afbf37b9

Download Submit
memory/3728-0-0x00007FFAD5833000-0x00007FFAD5835000-memory.dmp

Filesize
8KB

Download
memory/3728-1-0x00000000001D0000-0x00000000004F4000-memory.dmp

Filesize
3.1MB

Download
memory/3728-2-0x00007FFAD5830000-0x00007FFAD62F1000-memory.dmp

Filesize
10.8MB

Download
memory/3728-10-0x00007FFAD5830000-0x00007FFAD62F1000-memory.dmp

Filesize
10.8MB

Download
memory/4876-9-0x00007FFAD5830000-0x00007FFAD62F1000-memory.dmp

Filesize
10.8MB

Download
memory/4876-11-0x00007FFAD5830000-0x00007FFAD62F1000-memory.dmp

Filesize
10.8MB

Download
memory/4876-12-0x000000001C440000-0x000000001C490000-memory.dmp

Filesize
320KB

Download
memory/4876-13-0x000000001C550000-0x000000001C602000-memory.dmp

Filesize
712KB

Download
memory/4876-14-0x00007FFAD5830000-0x00007FFAD62F1000-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