quasar | fe33baebf921d81c28b5c28ef1320a4f06f4e725e18c9547b0f3b23acf26afd6

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-01-2025 10:34

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General

Target

xeno.exe
Size

3.1MB
MD5

b41a318867f211209a6667cce4681bce
SHA1

e4cb286b8ba7f7d311453b7066b32c1650d1ffdb
SHA256

fe33baebf921d81c28b5c28ef1320a4f06f4e725e18c9547b0f3b23acf26afd6
SHA512

5c7814c9d807f06b1dbd01a9125fd501beed4f9d6afb30a94dc9284ed54badcd5c6c1f6a5f2dfbf8e1e9d137ad0291e2f540f1546d8eef359b5759793aa4400a
SSDEEP

49152:av3I22SsaNYfdPBldt698dBcjHwJRJ6ebR3LoGdMywTHHB72eh2NT:av422SsaNYfdPBldt6+dBcjHwJRJ6Y

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.68.1:4782

Mutex

948fde50-66bb-4ffd-aeca-4cc76d13c423

Attributes

encryption_key
FE78C5AAB1B8DB7C1492A05B7A35D613C6807754
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 3 IoCs

resource	yara_rule
behavioral1/memory/1548-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp	family_quasar
behavioral1/files/0x0009000000015d03-5.dat	family_quasar
behavioral1/memory/2844-9-0x0000000001280000-0x00000000015A4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2844	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
2724	schtasks.exe
2584	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1548	xeno.exe
Token: SeDebugPrivilege	2844	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2844	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1548 wrote to memory of 2724	1548	xeno.exe	28
PID 1548 wrote to memory of 2724	1548	xeno.exe	28
PID 1548 wrote to memory of 2724	1548	xeno.exe	28
PID 1548 wrote to memory of 2844	1548	xeno.exe	30
PID 1548 wrote to memory of 2844	1548	xeno.exe	30
PID 1548 wrote to memory of 2844	1548	xeno.exe	30
PID 2844 wrote to memory of 2584	2844	Client.exe	31
PID 2844 wrote to memory of 2584	2844	Client.exe	31
PID 2844 wrote to memory of 2584	2844	Client.exe	31

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\xeno.exe
"C:\Users\Admin\AppData\Local\Temp\xeno.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1548
- 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:2724
- 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:2844
- - 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:2584

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

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Downloads

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

Filesize
3.1MB

MD5
b41a318867f211209a6667cce4681bce

SHA1
e4cb286b8ba7f7d311453b7066b32c1650d1ffdb

SHA256
fe33baebf921d81c28b5c28ef1320a4f06f4e725e18c9547b0f3b23acf26afd6

SHA512
5c7814c9d807f06b1dbd01a9125fd501beed4f9d6afb30a94dc9284ed54badcd5c6c1f6a5f2dfbf8e1e9d137ad0291e2f540f1546d8eef359b5759793aa4400a

Download Submit
memory/1548-0-0x000007FEF6163000-0x000007FEF6164000-memory.dmp

Filesize
4KB

Download
memory/1548-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp

Filesize
3.1MB

Download
memory/1548-2-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

Filesize
9.9MB

Download
memory/1548-8-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

Filesize
9.9MB

Download
memory/2844-7-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

Filesize
9.9MB

Download
memory/2844-9-0x0000000001280000-0x00000000015A4000-memory.dmp

Filesize
3.1MB

Download
memory/2844-10-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

Filesize
9.9MB

Download
memory/2844-11-0x000007FEF6160000-0x000007FEF6B4C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads