quasar | f47017465588d49383d9bb5071956e251d4c2ab024270f97b6ba35a3e6e7dec8

Analysis

max time kernel
30s
max time network
28s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2025, 14:19

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General

Target

Client-built10.exe
Size

3.1MB
MD5

8b09b710cf79da2dbb54ac8548eee0ad
SHA1

b75efaae2675e05f51337bb1380c38b692074656
SHA256

f47017465588d49383d9bb5071956e251d4c2ab024270f97b6ba35a3e6e7dec8
SHA512

92e08ed6248f7e25e630dcfdfadeac8ada8a402def03da2c74c1d69455a8f0262648cb3b14195ea8b7cb7e1de8e510f9fdff897017db9babb675eebd6e07feb5
SSDEEP

49152:WvUt62XlaSFNWPjljiFa2RoUYIxC11JuAoGd/THHB72eh2NT:WvI62XlaSFNWPjljiFXRoUYIxCF

Score

10^/10

quasar kazeku spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

kazeku

0.tcp.ap.ngrok.io:10431

Mutex

7fb11f4b-e530-407c-a46c-8834ab5c4f45

Attributes

encryption_key
2E002E0BA1D95CECCDECD8F8B383C3F7C76A7FD7
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
kazeku
subdirectory
kazeku

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/5352-1-0x0000000000B60000-0x0000000000E84000-memory.dmp	family_quasar
behavioral2/files/0x000800000002433d-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1756	Client.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 IoCs

Web Service

T1102

flow	ioc
9	0.tcp.ap.ngrok.io

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\kazeku\Client.exe	Client-built10.exe
File created	C:\Program Files\kazeku\Client.exe	Client-built10.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
5800	schtasks.exe
5436	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5352	Client-built10.exe
Token: SeDebugPrivilege	1756	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1756	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5352 wrote to memory of 5800	5352	Client-built10.exe	87
PID 5352 wrote to memory of 5800	5352	Client-built10.exe	87
PID 5352 wrote to memory of 1756	5352	Client-built10.exe	90
PID 5352 wrote to memory of 1756	5352	Client-built10.exe	90
PID 1756 wrote to memory of 5436	1756	Client.exe	93
PID 1756 wrote to memory of 5436	1756	Client.exe	93

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-built10.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built10.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5352
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "kazeku" /sc ONLOGON /tr "C:\Program Files\kazeku\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5800
- C:\Program Files\kazeku\Client.exe
  "C:\Program Files\kazeku\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1756
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "kazeku" /sc ONLOGON /tr "C:\Program Files\kazeku\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5436

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

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Program Files\kazeku\Client.exe

Filesize
3.1MB

MD5
8b09b710cf79da2dbb54ac8548eee0ad

SHA1
b75efaae2675e05f51337bb1380c38b692074656

SHA256
f47017465588d49383d9bb5071956e251d4c2ab024270f97b6ba35a3e6e7dec8

SHA512
92e08ed6248f7e25e630dcfdfadeac8ada8a402def03da2c74c1d69455a8f0262648cb3b14195ea8b7cb7e1de8e510f9fdff897017db9babb675eebd6e07feb5

Download Submit
memory/1756-9-0x00007FF9E0EC0000-0x00007FF9E1981000-memory.dmp

Filesize
10.8MB

Download
memory/1756-10-0x00007FF9E0EC0000-0x00007FF9E1981000-memory.dmp

Filesize
10.8MB

Download
memory/1756-11-0x000000001C160000-0x000000001C1B0000-memory.dmp

Filesize
320KB

Download
memory/1756-12-0x000000001C270000-0x000000001C322000-memory.dmp

Filesize
712KB

Download
memory/1756-13-0x00007FF9E0EC0000-0x00007FF9E1981000-memory.dmp

Filesize
10.8MB

Download
memory/5352-0-0x00007FF9E0EC3000-0x00007FF9E0EC5000-memory.dmp

Filesize
8KB

Download
memory/5352-1-0x0000000000B60000-0x0000000000E84000-memory.dmp

Filesize
3.1MB

Download
memory/5352-2-0x00007FF9E0EC0000-0x00007FF9E1981000-memory.dmp

Filesize
10.8MB

Download
memory/5352-8-0x00007FF9E0EC0000-0x00007FF9E1981000-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