quasar | 685c721b920861aa69eef6902155b3b84ff3a85e7dc4a0388965f8966989b04a

Analysis

max time kernel
21s
max time network
18s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 03:27

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General

Target

Client-built.exe
Size

3.1MB
MD5

e86fb7102e34f936aa128fa8e1c8204b
SHA1

c7fc6d96da627bee860e022c5ae93795835422ef
SHA256

685c721b920861aa69eef6902155b3b84ff3a85e7dc4a0388965f8966989b04a
SHA512

a733d3f845bdc7c032c4102a86907aa7f5bd25901c16d760ef2a565650060c639a670ce04c5fedbc0c8a18311afec882bf7b0c5e4697f8144325e516fde29f90
SSDEEP

49152:PvyI22SsaNYfdPBldt698dBcjHtfRJ6/bR3LoGdilmTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjHtfRJ6Ry

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/3000-1-0x0000000000030000-0x0000000000354000-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
2968	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3000	Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3000 wrote to memory of 2968	3000	Client-built.exe	29
PID 3000 wrote to memory of 2968	3000	Client-built.exe	29
PID 3000 wrote to memory of 2968	3000	Client-built.exe	29

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:3000
- 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:2968

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/3000-0-0x000007FEF6423000-0x000007FEF6424000-memory.dmp

Filesize
4KB

Download
memory/3000-1-0x0000000000030000-0x0000000000354000-memory.dmp

Filesize
3.1MB

Download
memory/3000-2-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download
memory/3000-4-0x000007FEF6423000-0x000007FEF6424000-memory.dmp

Filesize
4KB

Download
memory/3000-5-0x000007FEF6420000-0x000007FEF6E0C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads