quasar | b03fe87bdc5b196912492fbbf7de2d5d052ba9be2387731c485d71aa72f2682c

Analysis

max time kernel
150s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
27-12-2024 03:59

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General

Target

Client-built.exe
Size

3.1MB
MD5

7875137406f7a2a8ef308a0155274879
SHA1

950cdcf1c2a5432825d941224c99d399f2fa4ec6
SHA256

b03fe87bdc5b196912492fbbf7de2d5d052ba9be2387731c485d71aa72f2682c
SHA512

f7ca3bc5197fa1711550a4bc880c42b35913292f1b1e4761912ba50a95357674b3735004076401b5bcf9af88c6e8c5be928d49b97f10ff039412a0d524d03a47
SSDEEP

49152:rvvI22SsaNYfdPBldt698dBcjH5oHSmztNoGd5THHB72eh2NT:rvg22SsaNYfdPBldt6+dBcjH5oHD

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

99.158.40.205:4782

Mutex

9b87aeaa-0335-4ea7-8b7c-669e8b94b68e

Attributes

encryption_key
EF070280F01636B40C0F0E99C1661A590CF4BA82
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/3492-1-0x0000000000110000-0x0000000000434000-memory.dmp	family_quasar
behavioral2/files/0x001a00000002aac7-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1172	Client.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.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
504	schtasks.exe
564	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3492	Client-built.exe
Token: SeDebugPrivilege	1172	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1172	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3492 wrote to memory of 504	3492	Client-built.exe	77
PID 3492 wrote to memory of 504	3492	Client-built.exe	77
PID 3492 wrote to memory of 1172	3492	Client-built.exe	79
PID 3492 wrote to memory of 1172	3492	Client-built.exe	79
PID 1172 wrote to memory of 564	1172	Client.exe	80
PID 1172 wrote to memory of 564	1172	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⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3492
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:504
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1172
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:564

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1500

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:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
7875137406f7a2a8ef308a0155274879

SHA1
950cdcf1c2a5432825d941224c99d399f2fa4ec6

SHA256
b03fe87bdc5b196912492fbbf7de2d5d052ba9be2387731c485d71aa72f2682c

SHA512
f7ca3bc5197fa1711550a4bc880c42b35913292f1b1e4761912ba50a95357674b3735004076401b5bcf9af88c6e8c5be928d49b97f10ff039412a0d524d03a47

Download Submit
memory/1172-8-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/1172-10-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/1172-11-0x000000001BEA0000-0x000000001BEF0000-memory.dmp

Filesize
320KB

Download
memory/1172-12-0x000000001C660000-0x000000001C712000-memory.dmp

Filesize
712KB

Download
memory/1172-13-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/3492-0-0x00007FFF1D2C3000-0x00007FFF1D2C5000-memory.dmp

Filesize
8KB

Download
memory/3492-1-0x0000000000110000-0x0000000000434000-memory.dmp

Filesize
3.1MB

Download
memory/3492-2-0x00007FFF1D2C0000-0x00007FFF1DD82000-memory.dmp

Filesize
10.8MB

Download
memory/3492-9-0x00007FFF1D2C0000-0x00007FFF1DD82000-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