quasar | aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b

Analysis

max time kernel
127s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
08-02-2025 18:00

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General

Target

Client-built.exe
Size

3.1MB
MD5

a72eb9413e621f09991cb29a3a1209c0
SHA1

ff376c2982c20f671c9d282fa9891c17d2dd7f8d
SHA256

aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b
SHA512

ef7c21b9b59eb28764c36392635a256dccc2b67896c384736da6ebb30166a2c565550b9967fa206262dcbad5d08e340edf2ea41d897a5b3ba4ced218e3354a3d
SSDEEP

49152:KveI22SsaNYfdPBldt698dBcjHk7RJ6QbR3LoGdmTHHB72eh2NT:KvT22SsaNYfdPBldt6+dBcjHk7RJ6q

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.254:4782

Mutex

b5c485dd-0be7-4175-9240-b94d067a1289

Attributes

encryption_key
ACAEE58B1EF31BFCC4D37857EF8688477F9EBF41
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/3972-1-0x00000000007A0000-0x0000000000AC4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c93-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1896	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
3620	schtasks.exe
2184	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3972	Client-built.exe
Token: SeDebugPrivilege	1896	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1896	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1896	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1896	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3972 wrote to memory of 3620	3972	Client-built.exe	87
PID 3972 wrote to memory of 3620	3972	Client-built.exe	87
PID 3972 wrote to memory of 1896	3972	Client-built.exe	89
PID 3972 wrote to memory of 1896	3972	Client-built.exe	89
PID 1896 wrote to memory of 2184	1896	Client.exe	90
PID 1896 wrote to memory of 2184	1896	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3972
- 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:3620
- 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:1896
- - 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:2184

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
a72eb9413e621f09991cb29a3a1209c0

SHA1
ff376c2982c20f671c9d282fa9891c17d2dd7f8d

SHA256
aea58b72a2a36d5f0401caba08756cad63465d1b40466cb77809f554b6e5d02b

SHA512
ef7c21b9b59eb28764c36392635a256dccc2b67896c384736da6ebb30166a2c565550b9967fa206262dcbad5d08e340edf2ea41d897a5b3ba4ced218e3354a3d

Download Submit
memory/1896-9-0x00007FFD26FA0000-0x00007FFD27A61000-memory.dmp

Filesize
10.8MB

Download
memory/1896-10-0x00007FFD26FA0000-0x00007FFD27A61000-memory.dmp

Filesize
10.8MB

Download
memory/1896-11-0x000000001C4C0000-0x000000001C510000-memory.dmp

Filesize
320KB

Download
memory/1896-12-0x000000001C5D0000-0x000000001C682000-memory.dmp

Filesize
712KB

Download
memory/1896-13-0x00007FFD26FA0000-0x00007FFD27A61000-memory.dmp

Filesize
10.8MB

Download
memory/3972-0-0x00007FFD26FA3000-0x00007FFD26FA5000-memory.dmp

Filesize
8KB

Download
memory/3972-1-0x00000000007A0000-0x0000000000AC4000-memory.dmp

Filesize
3.1MB

Download
memory/3972-2-0x00007FFD26FA0000-0x00007FFD27A61000-memory.dmp

Filesize
10.8MB

Download
memory/3972-8-0x00007FFD26FA0000-0x00007FFD27A61000-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