quasar | 720baa82d1885d2cf6338413d10658192fd6ba861a8d0f4dcc42501af9782f7a

Analysis

max time kernel
126s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20250410-en
resource tags

arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
submitted
20/04/2025, 12:52

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General

Target

Client-built.exe
Size

3.1MB
MD5

da6777d48b7b3c6687ac0d91a8306a85
SHA1

ea1e9305c2131c19ba475cabbfff6222f8d81c29
SHA256

720baa82d1885d2cf6338413d10658192fd6ba861a8d0f4dcc42501af9782f7a
SHA512

31262d51f78b8643cc1bfc5e5a2098ce5b6c8a68644999b8dc99944e92707c9a27f8c62dbe17eff01ef7b19a41a84dd125a4d783246a7ef15383a667cc03295f
SSDEEP

49152:2vht62XlaSFNWPjljiFa2RoUYIGT/5h8arNqoGdkHTHHB72eh2NT:2vL62XlaSFNWPjljiFXRoUYIKxha

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.117:443

Mutex

a7074e5e-ed13-4240-b2bd-3139cf111cf4

Attributes

encryption_key
B1A93851F2B7AB11E1C412D6A94DD30CC9FC53BD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java update
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/4936-1-0x0000000000B70000-0x0000000000E94000-memory.dmp	family_quasar
behavioral2/files/0x001e00000002af1a-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
640	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
4776	schtasks.exe
2752	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4936	Client-built.exe
Token: SeDebugPrivilege	640	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
640	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
640	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4936 wrote to memory of 4776	4936	Client-built.exe	78
PID 4936 wrote to memory of 4776	4936	Client-built.exe	78
PID 4936 wrote to memory of 640	4936	Client-built.exe	80
PID 4936 wrote to memory of 640	4936	Client-built.exe	80
PID 640 wrote to memory of 2752	640	Client.exe	81
PID 640 wrote to memory of 2752	640	Client.exe	81

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:4936
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "java update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4776
- 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:640
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2752

Network

MITRE ATT&CK Enterprise v16

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
da6777d48b7b3c6687ac0d91a8306a85

SHA1
ea1e9305c2131c19ba475cabbfff6222f8d81c29

SHA256
720baa82d1885d2cf6338413d10658192fd6ba861a8d0f4dcc42501af9782f7a

SHA512
31262d51f78b8643cc1bfc5e5a2098ce5b6c8a68644999b8dc99944e92707c9a27f8c62dbe17eff01ef7b19a41a84dd125a4d783246a7ef15383a667cc03295f

Download Submit
memory/640-9-0x00007FFC616F0000-0x00007FFC621B2000-memory.dmp

Filesize
10.8MB

Download
memory/640-10-0x00007FFC616F0000-0x00007FFC621B2000-memory.dmp

Filesize
10.8MB

Download
memory/640-11-0x000000001BD10000-0x000000001BD60000-memory.dmp

Filesize
320KB

Download
memory/640-12-0x000000001BE20000-0x000000001BED2000-memory.dmp

Filesize
712KB

Download
memory/640-13-0x00007FFC616F0000-0x00007FFC621B2000-memory.dmp

Filesize
10.8MB

Download
memory/4936-0-0x00007FFC616F3000-0x00007FFC616F5000-memory.dmp

Filesize
8KB

Download
memory/4936-1-0x0000000000B70000-0x0000000000E94000-memory.dmp

Filesize
3.1MB

Download
memory/4936-2-0x00007FFC616F0000-0x00007FFC621B2000-memory.dmp

Filesize
10.8MB

Download
memory/4936-8-0x00007FFC616F0000-0x00007FFC621B2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads