quasar | 5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29

Analysis

max time kernel
125s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
18-01-2025 04:26

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General

Target

5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe
Size

502KB
MD5

9aae678c7cea5987d5092a61623207e2
SHA1

0243213e394988c281596785b9cdd3c5c8db0253
SHA256

5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29
SHA512

1f4e1df5d6936048456b493ed2d4268f611b94940f51b41c3c70f925306b451201d882e59031c80cd265ecbe84e0e22f57cc2f5446a9390a87973254db034be9
SSDEEP

12288:1TEgdfYXxURT3qh4kywJUpvZKJyRXMUykUcdW:WUw+25ywJUpvZKJGn8cdW

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

93.177.102.208:1337

Mutex

b1f80fe6-27eb-4a1c-bb91-851d5cd8d500

Attributes

encryption_key
9C554DBE5929DA2C3E389A9DF35A30153D68038C
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Java Updater
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/1856-1-0x00000000005F0000-0x0000000000674000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b8d-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
372	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
4596	schtasks.exe
2352	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1856	5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe
Token: SeDebugPrivilege	372	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
372	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
372	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1856 wrote to memory of 4596	1856	5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe	83
PID 1856 wrote to memory of 4596	1856	5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe	83
PID 1856 wrote to memory of 372	1856	5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe	85
PID 1856 wrote to memory of 372	1856	5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe	85
PID 372 wrote to memory of 2352	372	Client.exe	86
PID 372 wrote to memory of 2352	372	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\5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe
"C:\Users\Admin\AppData\Local\Temp\5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1856
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4596
- 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:372
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2352

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\Roaming\SubDir\Client.exe

Filesize
502KB

MD5
9aae678c7cea5987d5092a61623207e2

SHA1
0243213e394988c281596785b9cdd3c5c8db0253

SHA256
5f541a16b678fb79fe6dc150a57108881efc9d392e77644024e288a38c02ff29

SHA512
1f4e1df5d6936048456b493ed2d4268f611b94940f51b41c3c70f925306b451201d882e59031c80cd265ecbe84e0e22f57cc2f5446a9390a87973254db034be9

Download Submit
memory/372-10-0x00007FFA03C40000-0x00007FFA04701000-memory.dmp

Filesize
10.8MB

Download
memory/372-8-0x00007FFA03C40000-0x00007FFA04701000-memory.dmp

Filesize
10.8MB

Download
memory/372-11-0x000000001C640000-0x000000001C690000-memory.dmp

Filesize
320KB

Download
memory/372-12-0x000000001C750000-0x000000001C802000-memory.dmp

Filesize
712KB

Download
memory/372-13-0x00007FFA03C40000-0x00007FFA04701000-memory.dmp

Filesize
10.8MB

Download
memory/1856-0-0x00007FFA03C43000-0x00007FFA03C45000-memory.dmp

Filesize
8KB

Download
memory/1856-1-0x00000000005F0000-0x0000000000674000-memory.dmp

Filesize
528KB

Download
memory/1856-2-0x00007FFA03C40000-0x00007FFA04701000-memory.dmp

Filesize
10.8MB

Download
memory/1856-9-0x00007FFA03C40000-0x00007FFA04701000-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