quasar | 28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04

Analysis

max time kernel
118s
max time network
124s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 03:50

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General

Target

M5JUU_Client-built.exe
Size

3.1MB
MD5

bee705cc59266d8ab855c591599b0f09
SHA1

cb2ab1afc9bee0d41786559505abb7220b7f83c8
SHA256

28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04
SHA512

6971cb2c3ee9efad0e14b162a074b10820a3d0e49f27aeead26302b3e74413033512eb502447b39f0e5776f21c72b8feacd0d0035fefcdbfab72a805eb7d423b
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjHctflEmLek/znLVGdn7FTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjHctfhLA7

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

3808ff71-c2df-4538-8d66-6459677347c3

Attributes

encryption_key
24BCF759F51AE66E5C4BF0A521BA79747D6F977F
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 1 IoCs

resource	yara_rule
behavioral1/memory/2816-1-0x00000000012F0000-0x0000000001614000-memory.dmp	family_quasar

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2860	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2816	M5JUU_Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2816 wrote to memory of 2860	2816	M5JUU_Client-built.exe	30
PID 2816 wrote to memory of 2860	2816	M5JUU_Client-built.exe	30
PID 2816 wrote to memory of 2860	2816	M5JUU_Client-built.exe	30

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\M5JUU_Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\M5JUU_Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2816
- 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:2860

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

memory/2816-0-0x000007FEF6383000-0x000007FEF6384000-memory.dmp

Filesize
4KB

Download
memory/2816-1-0x00000000012F0000-0x0000000001614000-memory.dmp

Filesize
3.1MB

Download
memory/2816-2-0x000007FEF6380000-0x000007FEF6D6C000-memory.dmp

Filesize
9.9MB

Download
memory/2816-4-0x000007FEF6383000-0x000007FEF6384000-memory.dmp

Filesize
4KB

Download
memory/2816-5-0x000007FEF6380000-0x000007FEF6D6C000-memory.dmp

Filesize
9.9MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads