quasar | b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8

Analysis

max time kernel
118s
max time network
120s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
11/04/2025, 10:08

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General

Target

Client-built.exe
Size

3.1MB
MD5

77de6e8143094a619804ebf2d59eb094
SHA1

b87fc79d0825d979314c392781b0211087e78ca2
SHA256

b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8
SHA512

fa6dcd1d8b78548e12d22098a6b9107a744b9b85dd8276c18faf601f30ada97e7f023c6e376dc929c715c308a57b1105199acdd69697a0e6930bccd7afc2a6f9
SSDEEP

49152:zvylL26AaNeWgPhlmVqvMQ7XSKokCP1JSLoGdatCTHHB72eh2NT:zvqL26AaNeWgPhlmVqkQ7XSKokCs

Score

10^/10

quasar test spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Test

193.161.193.99:35184

67.205.154.243:35184

Mutex

9cabbafb-503b-49f1-ab22-adc756455c10

Attributes

encryption_key
8B93C77AC1C58EA80A3327E9FD26246A79EF3B8E
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
MS Build Tools
subdirectory
Microsoft-Build-Tools

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/6040-1-0x00000000009E0000-0x0000000000D04000-memory.dmp	family_quasar
behavioral1/files/0x0007000000024239-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2772	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
368	schtasks.exe
2944	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	6040	Client-built.exe
Token: SeDebugPrivilege	2772	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2772	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6040 wrote to memory of 368	6040	Client-built.exe	87
PID 6040 wrote to memory of 368	6040	Client-built.exe	87
PID 6040 wrote to memory of 2772	6040	Client-built.exe	90
PID 6040 wrote to memory of 2772	6040	Client-built.exe	90
PID 2772 wrote to memory of 2944	2772	Client.exe	92
PID 2772 wrote to memory of 2944	2772	Client.exe	92

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:6040
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "MS Build Tools" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:368
- C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2772
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "MS Build Tools" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Microsoft-Build-Tools\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2944

Network

MITRE ATT&CK Enterprise v16

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\Microsoft-Build-Tools\Client.exe

Filesize
3.1MB

MD5
77de6e8143094a619804ebf2d59eb094

SHA1
b87fc79d0825d979314c392781b0211087e78ca2

SHA256
b961d39237a098049a7ba1b6c78f2f02b6f1b9e80d149593f3103aafb6b215b8

SHA512
fa6dcd1d8b78548e12d22098a6b9107a744b9b85dd8276c18faf601f30ada97e7f023c6e376dc929c715c308a57b1105199acdd69697a0e6930bccd7afc2a6f9

Download Submit
memory/2772-8-0x00007FFCB7110000-0x00007FFCB7BD1000-memory.dmp

Filesize
10.8MB

Download
memory/2772-9-0x00007FFCB7110000-0x00007FFCB7BD1000-memory.dmp

Filesize
10.8MB

Download
memory/2772-10-0x0000000002AF0000-0x0000000002B40000-memory.dmp

Filesize
320KB

Download
memory/2772-11-0x000000001BD60000-0x000000001BE12000-memory.dmp

Filesize
712KB

Download
memory/2772-13-0x00007FFCB7110000-0x00007FFCB7BD1000-memory.dmp

Filesize
10.8MB

Download
memory/6040-0-0x00007FFCB7113000-0x00007FFCB7115000-memory.dmp

Filesize
8KB

Download
memory/6040-1-0x00000000009E0000-0x0000000000D04000-memory.dmp

Filesize
3.1MB

Download
memory/6040-2-0x00007FFCB7110000-0x00007FFCB7BD1000-memory.dmp

Filesize
10.8MB

Download
memory/6040-12-0x00007FFCB7110000-0x00007FFCB7BD1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads