quasar | c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82

Analysis

max time kernel
126s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
22-01-2025 22:49

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General

Target

Client-built.exe
Size

3.1MB
MD5

9c5ec5683c91176f1146cbc9b427e518
SHA1

2eccfa9607f1a9023079c4f88aa72b5a552bed70
SHA256

c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82
SHA512

5aa2bc8d741b10e1d94431db71e69d6d19f1ca52cafc3580c2efcae45c82d74932b42a969a9ef69973aaa799809cef648477fae5356f456953d29335fe854fcc
SSDEEP

49152:mvyI22SsaNYfdPBldt698dBcjHll6bs1JGLoGdd8FiTHHB72eh2NT:mvf22SsaNYfdPBldt6+dBcjHWbb

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.12:4782

Mutex

0372494a-0bed-4fef-b80b-1e5a15a502c1

Attributes

encryption_key
C79910CC46FB1EA158892672F174AE58510A5B0F
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/2648-1-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b75-8.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4176	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
3860	schtasks.exe
3688	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2648	Client-built.exe
Token: SeDebugPrivilege	4176	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4176	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 3860	2648	Client-built.exe	83
PID 2648 wrote to memory of 3860	2648	Client-built.exe	83
PID 2648 wrote to memory of 4176	2648	Client-built.exe	85
PID 2648 wrote to memory of 4176	2648	Client-built.exe	85
PID 4176 wrote to memory of 3688	4176	Client.exe	86
PID 4176 wrote to memory of 3688	4176	Client.exe	86

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:2648
- 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:3860
- 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:4176
- - 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:3688

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
9c5ec5683c91176f1146cbc9b427e518

SHA1
2eccfa9607f1a9023079c4f88aa72b5a552bed70

SHA256
c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82

SHA512
5aa2bc8d741b10e1d94431db71e69d6d19f1ca52cafc3580c2efcae45c82d74932b42a969a9ef69973aaa799809cef648477fae5356f456953d29335fe854fcc

Download Submit
memory/2648-0-0x00007FFBE16B3000-0x00007FFBE16B5000-memory.dmp

Filesize
8KB

Download
memory/2648-1-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2648-2-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/2648-13-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/4176-9-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/4176-10-0x00007FFBE16B0000-0x00007FFBE2171000-memory.dmp

Filesize
10.8MB

Download
memory/4176-11-0x0000000001730000-0x0000000001780000-memory.dmp

Filesize
320KB

Download
memory/4176-12-0x000000001C370000-0x000000001C422000-memory.dmp

Filesize
712KB

Download
memory/4176-14-0x00007FFBE16B0000-0x00007FFBE2171000-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