quasar | 37393231ee6c2f1e4e81bb820867302f509abe5108d7e6eac891fe1ab4b66ca5

Analysis

max time kernel
148s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:15

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General

Target

b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe
Size

3.1MB
MD5

87dfddb45995c73454ba66221a7d5ccb
SHA1

e19424b088d2bbadce97c09bb47274b0a903a0f1
SHA256

b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6
SHA512

ca836583e98785ade578648a721dd9e541c6a41ec2b72b92b7ba6af186000c4b224ea4a7a635f9a4dbd8e582932cd346ca9216c34b633818cbddec1bb04cfee2
SSDEEP

49152:mvFt62XlaSFNWPjljiFa2RoUYIsIxNESE0k/i1LoGduTHHB72eh2NT:mv362XlaSFNWPjljiFXRoUYIfxvN

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

185.231.252.213:4782

Mutex

83869558-8cdc-407f-8360-c60becc36814

Attributes

encryption_key
319FB675FBEF028D45A1B7802E958A563903B876
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
update
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
behavioral10/memory/5508-1-0x0000000000080000-0x00000000003A4000-memory.dmp	family_quasar

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 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4616	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5508	b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5508	b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5508	b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5508	b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 5508 wrote to memory of 4616	5508	b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe	87
PID 5508 wrote to memory of 4616	5508	b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe	87

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\b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe
"C:\Users\Admin\AppData\Local\Temp\b55e92f4a25bac9a1f90a8cf3d7ef9c91d1649598d692eb497d8fed1f20a97a6.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5508
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4616

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

memory/5508-0-0x00007FFF33143000-0x00007FFF33145000-memory.dmp

Filesize
8KB

Download
memory/5508-1-0x0000000000080000-0x00000000003A4000-memory.dmp

Filesize
3.1MB

Download
memory/5508-2-0x00007FFF33140000-0x00007FFF33C01000-memory.dmp

Filesize
10.8MB

Download
memory/5508-3-0x000000001BC90000-0x000000001BCE0000-memory.dmp

Filesize
320KB

Download
memory/5508-4-0x000000001BDA0000-0x000000001BE52000-memory.dmp

Filesize
712KB

Download
memory/5508-5-0x00007FFF33143000-0x00007FFF33145000-memory.dmp

Filesize
8KB

Download
memory/5508-6-0x00007FFF33140000-0x00007FFF33C01000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads