quasar | 9f3064a561f1c6554ca816569553ccf751a9a22360184a53c9b32db66017dbca

Analysis

max time kernel
25s
max time network
21s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
13-11-2024 05:44

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General

Target

AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe
Size

3.1MB
MD5

434bebcd54481549163ce6c29eefb0ed
SHA1

f0a643b353cd1d5c16ededbec902ab4e8462a5cc
SHA256

9f3064a561f1c6554ca816569553ccf751a9a22360184a53c9b32db66017dbca
SHA512

3dcc0ae35b3d210e04042a70b933c00ad9fcf41eee9938e1239fc93a12f16cb1641ce2ac454e9893239d1f45c6065c21e3400a544db6c4e873a9cde5e3cde403
SSDEEP

49152:bvyI22SsaNYfdPBldt698dBcjHt5vE1JV/oGdcTHHB72eh2NT:bvf22SsaNYfdPBldt6+dBcjHt5vS

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

204.8.98.75:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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

Processes:

resource	yara_rule
behavioral1/memory/3148-1-0x0000000000710000-0x0000000000A34000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2560 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

Processes:

schtasks.exeschtasks.exe

pid process

3996 schtasks.exe
2856 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exeClient.exe

description pid process

Token: SeDebugPrivilege 3148 AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe
Token: SeDebugPrivilege 2560 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2560 Client.exe

pid	process
2560	Client.exe

pid	process
3996	schtasks.exe
2856	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3148	AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe
Token: SeDebugPrivilege	2560	Client.exe

pid	process
2560	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exeClient.exe

description	pid	process	target process
PID 3148 wrote to memory of 3996	3148	AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe	schtasks.exe
PID 3148 wrote to memory of 3996	3148	AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe	schtasks.exe
PID 3148 wrote to memory of 2560	3148	AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe	Client.exe
PID 3148 wrote to memory of 2560	3148	AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe	Client.exe
PID 2560 wrote to memory of 2856	2560	Client.exe	schtasks.exe
PID 2560 wrote to memory of 2856	2560	Client.exe	schtasks.exe

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\AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe
"C:\Users\Admin\AppData\Local\Temp\AIRVPNNNNNNNNNNNNNNNNNOSIRVEEEEEE.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3148
- 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:3996
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2560
- - 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:2856

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

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
434bebcd54481549163ce6c29eefb0ed

SHA1
f0a643b353cd1d5c16ededbec902ab4e8462a5cc

SHA256
9f3064a561f1c6554ca816569553ccf751a9a22360184a53c9b32db66017dbca

SHA512
3dcc0ae35b3d210e04042a70b933c00ad9fcf41eee9938e1239fc93a12f16cb1641ce2ac454e9893239d1f45c6065c21e3400a544db6c4e873a9cde5e3cde403

Download Submit
memory/2560-6-0x00007FFDF6280000-0x00007FFDF6D42000-memory.dmp

Filesize
10.8MB

Download
memory/2560-7-0x00007FFDF6280000-0x00007FFDF6D42000-memory.dmp

Filesize
10.8MB

Download
memory/2560-8-0x0000000002D30000-0x0000000002D80000-memory.dmp

Filesize
320KB

Download
memory/2560-9-0x000000001C8A0000-0x000000001C952000-memory.dmp

Filesize
712KB

Download
memory/2560-10-0x00007FFDF6280000-0x00007FFDF6D42000-memory.dmp

Filesize
10.8MB

Download
memory/3148-0-0x00007FFDF6283000-0x00007FFDF6285000-memory.dmp

Filesize
8KB

Download
memory/3148-1-0x0000000000710000-0x0000000000A34000-memory.dmp

Filesize
3.1MB

Download
memory/3148-2-0x00007FFDF6280000-0x00007FFDF6D42000-memory.dmp

Filesize
10.8MB

Download
memory/3148-5-0x00007FFDF6280000-0x00007FFDF6D42000-memory.dmp

Filesize
10.8MB

Download