quasar | 585994f293d32b4ec6e4dc54d1070be1d354cc8d664e093e04f803668a5dd7eb

Analysis

max time kernel
132s
max time network
149s
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, 02:46

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General

Target

ConfigOnlyfan.exe
Size

1.7MB
MD5

126d31857003b2419fcbbb56badd03ec
SHA1

3d3dba10a7b40717d5417c69e8ef877e9e020e5b
SHA256

585994f293d32b4ec6e4dc54d1070be1d354cc8d664e093e04f803668a5dd7eb
SHA512

5e28b04d1af7dd44425c38ca6d44ccb7070ba5e19023762012f40e5bfc844d9814faec5af50dd284ffda0077be8fa00f8a23fd08c7bc692639f4c56e5d126be3
SSDEEP

49152:zgqKIXz0IxxiXIHLyolt7queAFJX4PxYL:zzXxqIHL5t7bRIE

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.106:4782

Mutex

9c07f090-acd6-4680-ab7f-3c91d1c0952e

Attributes

encryption_key
08BDB12AD6EA6C42AF768FC9E335BD427791BC89
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/files/0x000900000002420e-6.dat	family_quasar
behavioral2/memory/1488-15-0x0000000000150000-0x0000000000474000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	ConfigOnlyfan.exe

Executes dropped EXE 2 IoCs

pid	Process
1488	start.exe
6100	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

T1053.005

pid	Process
3348	schtasks.exe
4744	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1488	start.exe
Token: SeDebugPrivilege	6100	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
6100	Client.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4468 wrote to memory of 1488	4468	ConfigOnlyfan.exe	94
PID 4468 wrote to memory of 1488	4468	ConfigOnlyfan.exe	94
PID 1488 wrote to memory of 3348	1488	start.exe	96
PID 1488 wrote to memory of 3348	1488	start.exe	96
PID 1488 wrote to memory of 6100	1488	start.exe	98
PID 1488 wrote to memory of 6100	1488	start.exe	98
PID 6100 wrote to memory of 4744	6100	Client.exe	100
PID 6100 wrote to memory of 4744	6100	Client.exe	100

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\ConfigOnlyfan.exe
"C:\Users\Admin\AppData\Local\Temp\ConfigOnlyfan.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4468
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\start.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\start.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1488
- - 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:3348
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:6100
  - - 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
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4744

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\start.exe

Filesize
3.1MB

MD5
8122ebd1a765415403ef9fc062f99f99

SHA1
f818aabab9f995de68b00f2817a4e8d7181109a6

SHA256
212e2f5028b47deefc88814fc58ad83728ade51b5986682e313f3f45eef90af6

SHA512
22c13f98dbf2cf4477071e93144fc0a627ce3028407cc00753a645ea4d8bdc8281144106e5c08af148937ec8b7195de749b341e191966cf9646e56e8dcd910c1

Download Submit
memory/1488-14-0x00007FFF58C03000-0x00007FFF58C05000-memory.dmp

Filesize
8KB

Download
memory/1488-15-0x0000000000150000-0x0000000000474000-memory.dmp

Filesize
3.1MB

Download
memory/1488-16-0x00007FFF58C00000-0x00007FFF596C1000-memory.dmp

Filesize
10.8MB

Download
memory/1488-23-0x00007FFF58C00000-0x00007FFF596C1000-memory.dmp

Filesize
10.8MB

Download
memory/6100-24-0x000000001BE50000-0x000000001BEA0000-memory.dmp

Filesize
320KB

Download
memory/6100-25-0x000000001BF60000-0x000000001C012000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads