quasar | e8a8edfe33db5e5f64d809af4e09c178a4f24c3664c52256453f006f751fa67e

Analysis

max time kernel
126s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2025, 21:08

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General

Target

Client-built.exe
Size

3.1MB
MD5

627472780aa08c81430c6e00a03a58b4
SHA1

5577504b7d6ff99497d5d5f546211a281583e349
SHA256

e8a8edfe33db5e5f64d809af4e09c178a4f24c3664c52256453f006f751fa67e
SHA512

dfac7c943bc97fae120bf9bc01749e10c25d83346091a7d3ffa9a57bf71561bc047583b4e9f45d1fbb7e8d35afc7dbde0e14f6b98982001c4b19bdd3bf44c15e
SSDEEP

49152:CvyI22SsaNYfdPBldt698dBcjHJiRJ61bR3LoGdl2THHB72eh2NT:Cvf22SsaNYfdPBldt6+dBcjHJiRJ6H

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.237.150:4782

Mutex

cca6f222-119d-4901-a7c0-415a3c461781

Attributes

encryption_key
A20ABDA3377B184B54624403E023FF2EBFFE49D6
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/5304-1-0x00000000001D0000-0x00000000004F4000-memory.dmp	family_quasar
behavioral2/files/0x00080000000242e7-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3488	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
2388	schtasks.exe
4956	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5304	Client-built.exe
Token: SeDebugPrivilege	3488	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3488	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5304 wrote to memory of 2388	5304	Client-built.exe	92
PID 5304 wrote to memory of 2388	5304	Client-built.exe	92
PID 5304 wrote to memory of 3488	5304	Client-built.exe	94
PID 5304 wrote to memory of 3488	5304	Client-built.exe	94
PID 3488 wrote to memory of 4956	3488	Client.exe	95
PID 3488 wrote to memory of 4956	3488	Client.exe	95

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:5304
- 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:2388
- 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:3488
- - 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:4956

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
627472780aa08c81430c6e00a03a58b4

SHA1
5577504b7d6ff99497d5d5f546211a281583e349

SHA256
e8a8edfe33db5e5f64d809af4e09c178a4f24c3664c52256453f006f751fa67e

SHA512
dfac7c943bc97fae120bf9bc01749e10c25d83346091a7d3ffa9a57bf71561bc047583b4e9f45d1fbb7e8d35afc7dbde0e14f6b98982001c4b19bdd3bf44c15e

Download Submit
memory/3488-10-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/3488-11-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/3488-12-0x00000000027C0000-0x0000000002810000-memory.dmp

Filesize
320KB

Download
memory/3488-13-0x000000001BAE0000-0x000000001BB92000-memory.dmp

Filesize
712KB

Download
memory/3488-14-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/5304-0-0x00007FFB7B243000-0x00007FFB7B245000-memory.dmp

Filesize
8KB

Download
memory/5304-1-0x00000000001D0000-0x00000000004F4000-memory.dmp

Filesize
3.1MB

Download
memory/5304-2-0x00007FFB7B240000-0x00007FFB7BD01000-memory.dmp

Filesize
10.8MB

Download
memory/5304-9-0x00007FFB7B240000-0x00007FFB7BD01000-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