quasar | 597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9 | Triage

Analysis

max time kernel
127s
max time network
146s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-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 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4460-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp	family_quasar
behavioral2/files/0x00280000000450ee-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
2532	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

Processes:

schtasks.exeschtasks.exe

pid	Process
4880	schtasks.exe
4896	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	4460	Client-built.exe
Token: SeDebugPrivilege	2532	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
2532	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
2532	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process	procid_target
PID 4460 wrote to memory of 4880	4460	Client-built.exe	83
PID 4460 wrote to memory of 4880	4460	Client-built.exe	83
PID 4460 wrote to memory of 2532	4460	Client-built.exe	85
PID 4460 wrote to memory of 2532	4460	Client-built.exe	85
PID 2532 wrote to memory of 4896	2532	Client.exe	86
PID 2532 wrote to memory of 4896	2532	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:4460
- 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:4880
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2532
- - 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:4896

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

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
671df8e1c2f83f10f1cfb3f447299806

SHA1
9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0

SHA256
597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9

SHA512
097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690

Download Submit
memory/2532-6-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp

Filesize
10.8MB

Download
memory/2532-7-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp

Filesize
10.8MB

Download
memory/2532-8-0x000000001D710000-0x000000001D760000-memory.dmp

Filesize
320KB

Download
memory/2532-9-0x000000001D820000-0x000000001D8D2000-memory.dmp

Filesize
712KB

Download
memory/2532-10-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp

Filesize
10.8MB

Download
memory/4460-0-0x00007FFE261B3000-0x00007FFE261B5000-memory.dmp

Filesize
8KB

Download
memory/4460-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp

Filesize
3.1MB

Download
memory/4460-2-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp

Filesize
10.8MB

Download
memory/4460-5-0x00007FFE261B0000-0x00007FFE26C72000-memory.dmp

Filesize
10.8MB

Download