quasar | df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453

Analysis

max time kernel
127s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
05-02-2025 05:25

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General

Target

df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe
Size

3.1MB
MD5

5069fe748eedf0e4041c185146320f3a
SHA1

2f99d5e6279049e4fea6df914c017843abf920cd
SHA256

df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453
SHA512

25b57d73ecccd7980ab75bbe740ea73238b268c9149692a2a57ceb64fba47999334bd6863fd272c11665f103aa3f5db6db79fbabb184ff6e17cadf2318b6775b
SSDEEP

49152:CvyI22SsaNYfdPBldt698dBcjHYxOZESD9k/rGoGdxTHHB72eh2NT:Cvf22SsaNYfdPBldt6+dBcjHYxOp

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.101:8080

Mutex

02b9d5d5-a658-4c3f-beb3-e1e9cbb4ed8e

Attributes

encryption_key
188193B0C2081128F4D28BCFDBDC78F4E505ED6B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
PC

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/1468-1-0x0000000000610000-0x0000000000934000-memory.dmp	family_quasar
behavioral2/files/0x0032000000023b2d-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2980	Client.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
4432	schtasks.exe
2828	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1468	df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe
Token: SeDebugPrivilege	2980	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2980	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1468 wrote to memory of 4432	1468	df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe	86
PID 1468 wrote to memory of 4432	1468	df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe	86
PID 1468 wrote to memory of 2980	1468	df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe	88
PID 1468 wrote to memory of 2980	1468	df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe	88
PID 2980 wrote to memory of 2828	2980	Client.exe	90
PID 2980 wrote to memory of 2828	2980	Client.exe	90

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\df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe
"C:\Users\Admin\AppData\Local\Temp\df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1468
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\PC\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4432
- C:\Users\Admin\AppData\Roaming\PC\Client.exe
  "C:\Users\Admin\AppData\Roaming\PC\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2980
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\PC\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2828

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

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Downloads

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

Filesize
3.1MB

MD5
5069fe748eedf0e4041c185146320f3a

SHA1
2f99d5e6279049e4fea6df914c017843abf920cd

SHA256
df1efbc7ad460171eccb432f6a1bea7fdfe239c0625a2a1fc2ba4e46121fd453

SHA512
25b57d73ecccd7980ab75bbe740ea73238b268c9149692a2a57ceb64fba47999334bd6863fd272c11665f103aa3f5db6db79fbabb184ff6e17cadf2318b6775b

Download Submit
memory/1468-0-0x00007FF8114F3000-0x00007FF8114F5000-memory.dmp

Filesize
8KB

Download
memory/1468-1-0x0000000000610000-0x0000000000934000-memory.dmp

Filesize
3.1MB

Download
memory/1468-2-0x00007FF8114F0000-0x00007FF811FB1000-memory.dmp

Filesize
10.8MB

Download
memory/1468-9-0x00007FF8114F0000-0x00007FF811FB1000-memory.dmp

Filesize
10.8MB

Download
memory/2980-10-0x00007FF8114F0000-0x00007FF811FB1000-memory.dmp

Filesize
10.8MB

Download
memory/2980-11-0x00007FF8114F0000-0x00007FF811FB1000-memory.dmp

Filesize
10.8MB

Download
memory/2980-12-0x000000001B6C0000-0x000000001B710000-memory.dmp

Filesize
320KB

Download
memory/2980-13-0x000000001C010000-0x000000001C0C2000-memory.dmp

Filesize
712KB

Download
memory/2980-14-0x00007FF8114F0000-0x00007FF811FB1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads