quasar | 9431c0edb66c91b824e87f2576c0329056838518cccea37c58f2ccecd5a78cd0

Analysis

max time kernel
126s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
06/01/2025, 18:39

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General

Target

MalwareBytes.exe
Size

3.1MB
MD5

1af2519e38937542ec6eca9bd1509026
SHA1

00f3d3e74fa6fe2e2299add76db4211de41996fa
SHA256

9431c0edb66c91b824e87f2576c0329056838518cccea37c58f2ccecd5a78cd0
SHA512

46289dede2688c3dadbe89087b0deab8f2def92bb9c30345d68ffae2c4a70ec84c0bd3af7c6967db3757682440744d81cd254dec804908a5d674175600bb1d33
SSDEEP

49152:7vyI22SsaNYfdPBldt698dBcjHOKRJ6abR3LoGd2THHB72eh2NT:7vf22SsaNYfdPBldt6+dBcjHOKRJ60

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.145:4782

Mutex

9d952f82-b8b7-4948-b2b7-53c225a63ebb

Attributes

encryption_key
AAB9DCB0841C8C889A6BCA76764D0770416B2FE1
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/2236-1-0x0000000000700000-0x0000000000A24000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b79-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4704	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
4904	schtasks.exe
2936	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2236	MalwareBytes.exe
Token: SeDebugPrivilege	4704	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4704	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 4904	2236	MalwareBytes.exe	82
PID 2236 wrote to memory of 4904	2236	MalwareBytes.exe	82
PID 2236 wrote to memory of 4704	2236	MalwareBytes.exe	84
PID 2236 wrote to memory of 4704	2236	MalwareBytes.exe	84
PID 4704 wrote to memory of 2936	4704	Client.exe	85
PID 4704 wrote to memory of 2936	4704	Client.exe	85

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\MalwareBytes.exe
"C:\Users\Admin\AppData\Local\Temp\MalwareBytes.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2236
- 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:4904
- 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:4704
- - 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:2936

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
1af2519e38937542ec6eca9bd1509026

SHA1
00f3d3e74fa6fe2e2299add76db4211de41996fa

SHA256
9431c0edb66c91b824e87f2576c0329056838518cccea37c58f2ccecd5a78cd0

SHA512
46289dede2688c3dadbe89087b0deab8f2def92bb9c30345d68ffae2c4a70ec84c0bd3af7c6967db3757682440744d81cd254dec804908a5d674175600bb1d33

Download Submit
memory/2236-0-0x00007FFA4CE53000-0x00007FFA4CE55000-memory.dmp

Filesize
8KB

Download
memory/2236-1-0x0000000000700000-0x0000000000A24000-memory.dmp

Filesize
3.1MB

Download
memory/2236-2-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

Filesize
10.8MB

Download
memory/2236-9-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

Filesize
10.8MB

Download
memory/4704-10-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

Filesize
10.8MB

Download
memory/4704-11-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

Filesize
10.8MB

Download
memory/4704-12-0x000000001B020000-0x000000001B070000-memory.dmp

Filesize
320KB

Download
memory/4704-13-0x000000001B9C0000-0x000000001BA72000-memory.dmp

Filesize
712KB

Download
memory/4704-14-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

Filesize
10.8MB

Download
memory/4704-15-0x000000001C0B0000-0x000000001C5D8000-memory.dmp

Filesize
5.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads