quasar | f8e5cfd63bc1fafc14772f29cfba051516776ce36ea054dcff65f46146b2a3b1 | Triage

Analysis

max time kernel
148s
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
04-01-2025 09:35

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General

Target

Client-built.exe
Size

3.1MB
MD5

786abdcb703d20e3de3bf5a379d81a14
SHA1

8e14e12df03ed017e2dd98fe1b00d4869ceacac4
SHA256

f8e5cfd63bc1fafc14772f29cfba051516776ce36ea054dcff65f46146b2a3b1
SHA512

28886a95fde73cc6bbf4252374a50979f893ba12d9ac92f95a40c46d5a9ef85dde436bf89a09eb84a7380d799b8ff59e50de7fd192ff17e4d7884d973fa39fe9
SSDEEP

49152:rvht62XlaSFNWPjljiFa2RoUYIYNi3Rar7loGdAxALTHHB72eh2NT:rvL62XlaSFNWPjljiFXRoUYIL3sH

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.46:4782

Mutex

5beee952-b6db-411d-a01f-ad2f22709cbe

Attributes

encryption_key
588523317381A841ECE4E6415CCED796AA0FA544
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/1968-1-0x0000000000EE0000-0x0000000001204000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b5f-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2584	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

pid	Process
3020	schtasks.exe
2492	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1968	Client-built.exe
Token: SeDebugPrivilege	2584	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2584	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2584	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1968 wrote to memory of 3020	1968	Client-built.exe	83
PID 1968 wrote to memory of 3020	1968	Client-built.exe	83
PID 1968 wrote to memory of 2584	1968	Client-built.exe	85
PID 1968 wrote to memory of 2584	1968	Client-built.exe	85
PID 2584 wrote to memory of 2492	2584	Client.exe	86
PID 2584 wrote to memory of 2492	2584	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:1968
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3020
- 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:2584
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2492

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:844

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
786abdcb703d20e3de3bf5a379d81a14

SHA1
8e14e12df03ed017e2dd98fe1b00d4869ceacac4

SHA256
f8e5cfd63bc1fafc14772f29cfba051516776ce36ea054dcff65f46146b2a3b1

SHA512
28886a95fde73cc6bbf4252374a50979f893ba12d9ac92f95a40c46d5a9ef85dde436bf89a09eb84a7380d799b8ff59e50de7fd192ff17e4d7884d973fa39fe9

Download Submit
memory/1968-0-0x00007FFD6EFA3000-0x00007FFD6EFA5000-memory.dmp

Filesize
8KB

Download
memory/1968-1-0x0000000000EE0000-0x0000000001204000-memory.dmp

Filesize
3.1MB

Download
memory/1968-2-0x00007FFD6EFA0000-0x00007FFD6FA61000-memory.dmp

Filesize
10.8MB

Download
memory/1968-8-0x00007FFD6EFA0000-0x00007FFD6FA61000-memory.dmp

Filesize
10.8MB

Download
memory/2584-9-0x00007FFD6EFA0000-0x00007FFD6FA61000-memory.dmp

Filesize
10.8MB

Download
memory/2584-10-0x00007FFD6EFA0000-0x00007FFD6FA61000-memory.dmp

Filesize
10.8MB

Download
memory/2584-11-0x000000001BE30000-0x000000001BE80000-memory.dmp

Filesize
320KB

Download
memory/2584-12-0x000000001BF40000-0x000000001BFF2000-memory.dmp

Filesize
712KB

Download
memory/2584-13-0x00007FFD6EFA0000-0x00007FFD6FA61000-memory.dmp

Filesize
10.8MB

Download