quasar | 597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9 | Triage

Analysis

max time kernel
122s
max time network
129s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
03/11/2024, 07:12

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General

Target

Client-built.exe
Size

3.1MB
MD5

671df8e1c2f83f10f1cfb3f447299806
SHA1

9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0
SHA256

597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9
SHA512

097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690
SSDEEP

49152:3v3I22SsaNYfdPBldt698dBcjHrExNESEok/iTLoGd3ITHHB72eh2NT:3v422SsaNYfdPBldt6+dBcjHAxrf

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.18:4782

Mutex

44193681-10d5-4b16-9270-2c8ec974b704

Attributes

encryption_key
1F1F096D9E0048372D789D0F2D073EB8FE99A5E0
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
behavioral4/memory/2368-1-0x0000000000F20000-0x0000000001244000-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

pid	Process
2308	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2368	Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 2308	2368	Client-built.exe	30
PID 2368 wrote to memory of 2308	2368	Client-built.exe	30
PID 2368 wrote to memory of 2308	2368	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2368
- 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:2308

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2368-0-0x000007FEF5653000-0x000007FEF5654000-memory.dmp

Filesize
4KB

Download
memory/2368-1-0x0000000000F20000-0x0000000001244000-memory.dmp

Filesize
3.1MB

Download
memory/2368-2-0x000007FEF5650000-0x000007FEF603C000-memory.dmp

Filesize
9.9MB

Download
memory/2368-4-0x000007FEF5653000-0x000007FEF5654000-memory.dmp

Filesize
4KB

Download
memory/2368-5-0x000007FEF5650000-0x000007FEF603C000-memory.dmp

Filesize
9.9MB

Download