quasar | f0003f3b8243ba176fd8706d62d3bd777cd8eb8d57840ceef07d376f47c4b237

Analysis

max time kernel
55s
max time network
65s
platform
windows11-21h2_x64
resource
win11-20241023-en
resource tags

arch:x64arch:x86image:win11-20241023-enlocale:en-usos:windows11-21h2-x64system
submitted
04-02-2025 22:39

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General

Target

Client-built.exe
Size

3.2MB
MD5

b6a3f432c7707dbaaa75a1d606b7df0b
SHA1

f0333d868079382731e15bd88ecd07159490b04d
SHA256

f0003f3b8243ba176fd8706d62d3bd777cd8eb8d57840ceef07d376f47c4b237
SHA512

bf4c6a363359ff2490f388638543d267374c3f0da1a46b83345636fafa5f9337d546f3365c5bc95af867f59cfb88dcfce2119dc756465f6d32e611870e4e39ef
SSDEEP

49152:pvXG42pda6D+/PjlLOlg6yQipV3x9E1zOk/JxooGdofTHHB72eh2NT:pv242pda6D+/PjlLOlZyQipV3xay

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4800

2601:147:8500:53c0:959e:b4e0:7099:8e90:4800

10.0.0.34:4800

Mutex

dd229ccb-39cd-4301-9413-ea14fa25ce22

Attributes

encryption_key
F023A1C93603AFE96871B3F0323AA7B852FA745F
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
discord
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
behavioral1/memory/2328-1-0x0000000000380000-0x00000000006B4000-memory.dmp	family_quasar
behavioral1/files/0x001d00000002aae4-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4944	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
3332	schtasks.exe
552	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2328	Client-built.exe
Token: SeDebugPrivilege	4944	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4944	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2328 wrote to memory of 3332	2328	Client-built.exe	77
PID 2328 wrote to memory of 3332	2328	Client-built.exe	77
PID 2328 wrote to memory of 4944	2328	Client-built.exe	79
PID 2328 wrote to memory of 4944	2328	Client-built.exe	79
PID 4944 wrote to memory of 552	4944	Client.exe	80
PID 4944 wrote to memory of 552	4944	Client.exe	80

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:2328
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3332
- 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:4944
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:552

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
3.2MB

MD5
b6a3f432c7707dbaaa75a1d606b7df0b

SHA1
f0333d868079382731e15bd88ecd07159490b04d

SHA256
f0003f3b8243ba176fd8706d62d3bd777cd8eb8d57840ceef07d376f47c4b237

SHA512
bf4c6a363359ff2490f388638543d267374c3f0da1a46b83345636fafa5f9337d546f3365c5bc95af867f59cfb88dcfce2119dc756465f6d32e611870e4e39ef

Download Submit
memory/2328-0-0x00007FFC89233000-0x00007FFC89235000-memory.dmp

Filesize
8KB

Download
memory/2328-1-0x0000000000380000-0x00000000006B4000-memory.dmp

Filesize
3.2MB

Download
memory/2328-2-0x00007FFC89230000-0x00007FFC89CF2000-memory.dmp

Filesize
10.8MB

Download
memory/2328-9-0x00007FFC89230000-0x00007FFC89CF2000-memory.dmp

Filesize
10.8MB

Download
memory/4944-10-0x00007FFC89230000-0x00007FFC89CF2000-memory.dmp

Filesize
10.8MB

Download
memory/4944-11-0x00007FFC89230000-0x00007FFC89CF2000-memory.dmp

Filesize
10.8MB

Download
memory/4944-12-0x000000001B2E0000-0x000000001B330000-memory.dmp

Filesize
320KB

Download
memory/4944-13-0x000000001BAF0000-0x000000001BBA2000-memory.dmp

Filesize
712KB

Download
memory/4944-14-0x00007FFC89230000-0x00007FFC89CF2000-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