quasar | ccb74c64a45f838a6e7403d976d9b2d82afe40d96dc08952e6a374d8af3f09dd

Analysis

max time kernel
145s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
25-01-2025 14:23

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General

Target

Client-built.exe
Size

3.1MB
MD5

7dbac71bcc7920b66e8c4fc04fbc30dd
SHA1

c746b4358c2a15765a010c1890979239f152d6f7
SHA256

ccb74c64a45f838a6e7403d976d9b2d82afe40d96dc08952e6a374d8af3f09dd
SHA512

56ffa2c92d97ef6b247db44225f659d8894f0c4c1134a8376346eb8f0a36bbb3331803752b8e24ada28dc554ef14d2098627ae751152b9eba956bb5e4d7c0c24
SSDEEP

49152:bvylL26AaNeWgPhlmVqvMQ7XSKB4RJ6kbR3LoGdXdTHHB72eh2NT:bvqL26AaNeWgPhlmVqkQ7XSKB4RJ6uH

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

hojex31104-23437.portmap.host:23437

Mutex

de505f8f-b6d9-44cb-b9ce-7e2f491eb29e

Attributes

encryption_key
D9C52C486698B9297B9AC8B87A65EA67135BE386
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/1188-1-0x0000000000D40000-0x0000000001064000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c8b-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3968	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
3620	schtasks.exe
3500	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1188	Client-built.exe
Token: SeDebugPrivilege	3968	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3968	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3968	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3968	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1188 wrote to memory of 3620	1188	Client-built.exe	83
PID 1188 wrote to memory of 3620	1188	Client-built.exe	83
PID 1188 wrote to memory of 3968	1188	Client-built.exe	85
PID 1188 wrote to memory of 3968	1188	Client-built.exe	85
PID 3968 wrote to memory of 3500	3968	Client.exe	86
PID 3968 wrote to memory of 3500	3968	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:1188
- 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:3620
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3968
- - 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:3500

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
3.1MB

MD5
7dbac71bcc7920b66e8c4fc04fbc30dd

SHA1
c746b4358c2a15765a010c1890979239f152d6f7

SHA256
ccb74c64a45f838a6e7403d976d9b2d82afe40d96dc08952e6a374d8af3f09dd

SHA512
56ffa2c92d97ef6b247db44225f659d8894f0c4c1134a8376346eb8f0a36bbb3331803752b8e24ada28dc554ef14d2098627ae751152b9eba956bb5e4d7c0c24

Download Submit
memory/1188-0-0x00007FFF61233000-0x00007FFF61235000-memory.dmp

Filesize
8KB

Download
memory/1188-1-0x0000000000D40000-0x0000000001064000-memory.dmp

Filesize
3.1MB

Download
memory/1188-2-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/1188-8-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/3968-9-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/3968-10-0x00007FFF61230000-0x00007FFF61CF1000-memory.dmp

Filesize
10.8MB

Download
memory/3968-11-0x000000001C910000-0x000000001C960000-memory.dmp

Filesize
320KB

Download
memory/3968-12-0x000000001CA20000-0x000000001CAD2000-memory.dmp

Filesize
712KB

Download
memory/3968-13-0x00007FFF61230000-0x00007FFF61CF1000-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