quasar | 1ea872be9eeda2c5637a2f53b1121e88417bf0bff95fc12a2aeee9c48f0664e3 | Triage

Analysis

max time kernel
10s
max time network
14s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250128-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250128-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
31-01-2025 19:39

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General

Target

s.exe
Size

3.1MB
MD5

c710a6667ea3c649ee266a981893440d
SHA1

064314508d0579b471c568741ce170f1d6ce61d3
SHA256

1ea872be9eeda2c5637a2f53b1121e88417bf0bff95fc12a2aeee9c48f0664e3
SHA512

f9cc489459127a011f4e883f53d20c146d1ee2410e77b0c767162b11e42d2c3b19fb7fb40df841ce6c18bc3f3ad1b453de7692abaa69db71373c5a953fd31fe6
SSDEEP

49152:bvTlL26AaNeWgPhlmVqvMQ7XSK2ixNESEXk/idLoGdSTHHB72eh2NT:bvJL26AaNeWgPhlmVqkQ7XSKfxeV

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

per-cassette.gl.at.ply.gg:41388

Mutex

96621e5e-be82-4575-8b94-bb078b016935

Attributes

encryption_key
8372309E4F7DFDD0DD443E979B8B9374D4F2B48F
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
behavioral3/memory/2808-1-0x0000000000360000-0x0000000000684000-memory.dmp	family_quasar
behavioral3/files/0x000b000000027cc4-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2800	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
2588	schtasks.exe
4112	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2808	s.exe
Token: SeDebugPrivilege	2800	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2800	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2800	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2808 wrote to memory of 2588	2808	s.exe	83
PID 2808 wrote to memory of 2588	2808	s.exe	83
PID 2808 wrote to memory of 2800	2808	s.exe	85
PID 2808 wrote to memory of 2800	2808	s.exe	85
PID 2800 wrote to memory of 4112	2800	Client.exe	86
PID 2800 wrote to memory of 4112	2800	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\s.exe
"C:\Users\Admin\AppData\Local\Temp\s.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2808
- 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:2588
- 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:2800
- - 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:4112

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

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Downloads

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

Filesize
3.1MB

MD5
c710a6667ea3c649ee266a981893440d

SHA1
064314508d0579b471c568741ce170f1d6ce61d3

SHA256
1ea872be9eeda2c5637a2f53b1121e88417bf0bff95fc12a2aeee9c48f0664e3

SHA512
f9cc489459127a011f4e883f53d20c146d1ee2410e77b0c767162b11e42d2c3b19fb7fb40df841ce6c18bc3f3ad1b453de7692abaa69db71373c5a953fd31fe6

Download Submit
memory/2800-5-0x00007FFB062F0000-0x00007FFB06DB2000-memory.dmp

Filesize
10.8MB

Download
memory/2800-7-0x00007FFB062F0000-0x00007FFB06DB2000-memory.dmp

Filesize
10.8MB

Download
memory/2800-8-0x000000001CB10000-0x000000001CB60000-memory.dmp

Filesize
320KB

Download
memory/2800-9-0x000000001CC20000-0x000000001CCD2000-memory.dmp

Filesize
712KB

Download
memory/2800-10-0x00007FFB062F0000-0x00007FFB06DB2000-memory.dmp

Filesize
10.8MB

Download
memory/2808-0-0x00007FFB062F3000-0x00007FFB062F5000-memory.dmp

Filesize
8KB

Download
memory/2808-1-0x0000000000360000-0x0000000000684000-memory.dmp

Filesize
3.1MB

Download
memory/2808-2-0x00007FFB062F0000-0x00007FFB06DB2000-memory.dmp

Filesize
10.8MB

Download
memory/2808-6-0x00007FFB062F0000-0x00007FFB06DB2000-memory.dmp

Filesize
10.8MB

Download