quasar | a26517c83e728ad6838387fa72a896fa3fecfce7738f261094525664f2943ebe

Analysis

max time kernel
27s
max time network
29s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
05-02-2025 02:24

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General

Target

Client-built.exe
Size

3.1MB
MD5

c34c1c84a5ddc076f5c547552eddec32
SHA1

f297da8e6965bc67415883c9be02ba00d011f111
SHA256

a26517c83e728ad6838387fa72a896fa3fecfce7738f261094525664f2943ebe
SHA512

b423ac33a8a17b42cd59edd3b216295ec05261a8d8afa7032a16a70777aa0c366d7aada23f34dd3e1432de5a79d1e80a8898b711894fb807ce38d156916551c1
SSDEEP

49152:HvnI22SsaNYfdPBldt698dBcjHbrRJ6TbR3LoGdkTHHB72eh2NT:HvI22SsaNYfdPBldt6+dBcjHbrRJ6F

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

db685ca2-37a4-4b0f-a77e-669dd933618e

Attributes

encryption_key
6F9C27EEE52A9297584149E44D98C7DF193B4BC6
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
behavioral1/memory/1460-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp	family_quasar
behavioral1/files/0x001b00000002ab46-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2072	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
2484	schtasks.exe
416	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1460	Client-built.exe
Token: SeDebugPrivilege	2072	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2072	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2072	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2072	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1460 wrote to memory of 2484	1460	Client-built.exe	78
PID 1460 wrote to memory of 2484	1460	Client-built.exe	78
PID 1460 wrote to memory of 2072	1460	Client-built.exe	80
PID 1460 wrote to memory of 2072	1460	Client-built.exe	80
PID 2072 wrote to memory of 416	2072	Client.exe	81
PID 2072 wrote to memory of 416	2072	Client.exe	81

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:1460
- 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:2484
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2072
- - 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:416

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

System Information Discovery

T1082

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
c34c1c84a5ddc076f5c547552eddec32

SHA1
f297da8e6965bc67415883c9be02ba00d011f111

SHA256
a26517c83e728ad6838387fa72a896fa3fecfce7738f261094525664f2943ebe

SHA512
b423ac33a8a17b42cd59edd3b216295ec05261a8d8afa7032a16a70777aa0c366d7aada23f34dd3e1432de5a79d1e80a8898b711894fb807ce38d156916551c1

Download Submit
memory/1460-0-0x00007FFF04B73000-0x00007FFF04B75000-memory.dmp

Filesize
8KB

Download
memory/1460-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp

Filesize
3.1MB

Download
memory/1460-2-0x00007FFF04B70000-0x00007FFF05632000-memory.dmp

Filesize
10.8MB

Download
memory/1460-9-0x00007FFF04B70000-0x00007FFF05632000-memory.dmp

Filesize
10.8MB

Download
memory/2072-10-0x00007FFF04B70000-0x00007FFF05632000-memory.dmp

Filesize
10.8MB

Download
memory/2072-11-0x00007FFF04B70000-0x00007FFF05632000-memory.dmp

Filesize
10.8MB

Download
memory/2072-12-0x000000001C860000-0x000000001C8B0000-memory.dmp

Filesize
320KB

Download
memory/2072-13-0x000000001C970000-0x000000001CA22000-memory.dmp

Filesize
712KB

Download
memory/2072-14-0x00007FFF04B70000-0x00007FFF05632000-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