quasar | dbf2303343fab0a78ce528e1b9f553ab86b4693fb4bcfc585fefa7a20038fbd3

Analysis

max time kernel
126s
max time network
143s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
05-02-2025 03:34

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General

Target

Client-built.exe
Size

3.1MB
MD5

7a2b52c45786b1b63b5ce07eb1ae0865
SHA1

21c47fca7b0278e93d79dec401f8f2640540e946
SHA256

dbf2303343fab0a78ce528e1b9f553ab86b4693fb4bcfc585fefa7a20038fbd3
SHA512

75e71497a49636967398da0547aa643f03ce6003892ded04aed111fd7771523c9ea0e8de37d07e07b4313373e98c6f4dc05345bb2cc49802db074c8419ebc50f
SSDEEP

49152:yvnI22SsaNYfdPBldt698dBcjH69QaEf/rk/M59oGdWTHHB72eh2NT:yvI22SsaNYfdPBldt6+dBcjH69QPr

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

db685ca2-37a4-4b0f-a77e-669dd933618e

Attributes

encryption_key
6F9C27EEE52A9297584149E44D98C7DF193B4BC6
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
behavioral1/memory/4400-1-0x0000000000F40000-0x0000000001264000-memory.dmp	family_quasar
behavioral1/files/0x001f00000002aab4-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5972	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
5864	schtasks.exe
6116	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4400	Client-built.exe
Token: SeDebugPrivilege	5972	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5972	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5972	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5972	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4400 wrote to memory of 6116	4400	Client-built.exe	77
PID 4400 wrote to memory of 6116	4400	Client-built.exe	77
PID 4400 wrote to memory of 5972	4400	Client-built.exe	79
PID 4400 wrote to memory of 5972	4400	Client-built.exe	79
PID 5972 wrote to memory of 5864	5972	Client.exe	80
PID 5972 wrote to memory of 5864	5972	Client.exe	80

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:4400
- 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:6116
- 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:5972
- - 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:5864

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

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Downloads

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

Filesize
3.1MB

MD5
7a2b52c45786b1b63b5ce07eb1ae0865

SHA1
21c47fca7b0278e93d79dec401f8f2640540e946

SHA256
dbf2303343fab0a78ce528e1b9f553ab86b4693fb4bcfc585fefa7a20038fbd3

SHA512
75e71497a49636967398da0547aa643f03ce6003892ded04aed111fd7771523c9ea0e8de37d07e07b4313373e98c6f4dc05345bb2cc49802db074c8419ebc50f

Download Submit
memory/4400-0-0x00007FF994253000-0x00007FF994255000-memory.dmp

Filesize
8KB

Download
memory/4400-1-0x0000000000F40000-0x0000000001264000-memory.dmp

Filesize
3.1MB

Download
memory/4400-2-0x00007FF994250000-0x00007FF994D12000-memory.dmp

Filesize
10.8MB

Download
memory/4400-9-0x00007FF994250000-0x00007FF994D12000-memory.dmp

Filesize
10.8MB

Download
memory/5972-10-0x00007FF994250000-0x00007FF994D12000-memory.dmp

Filesize
10.8MB

Download
memory/5972-11-0x00007FF994250000-0x00007FF994D12000-memory.dmp

Filesize
10.8MB

Download
memory/5972-12-0x000000001C950000-0x000000001C9A0000-memory.dmp

Filesize
320KB

Download
memory/5972-13-0x000000001CA60000-0x000000001CB12000-memory.dmp

Filesize
712KB

Download
memory/5972-14-0x00007FF994250000-0x00007FF994D12000-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