quasar | 720baa82d1885d2cf6338413d10658192fd6ba861a8d0f4dcc42501af9782f7a

Analysis

max time kernel
126s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-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
behavioral1/memory/3624-1-0x00000000007F0000-0x0000000000B14000-memory.dmp	family_quasar
behavioral1/files/0x00070000000242aa-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5576	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
5964	schtasks.exe
1604	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3624	Client-built.exe
Token: SeDebugPrivilege	5576	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5576	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5576	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3624 wrote to memory of 5964	3624	Client-built.exe	87
PID 3624 wrote to memory of 5964	3624	Client-built.exe	87
PID 3624 wrote to memory of 5576	3624	Client-built.exe	89
PID 3624 wrote to memory of 5576	3624	Client-built.exe	89
PID 5576 wrote to memory of 1604	5576	Client.exe	90
PID 5576 wrote to memory of 1604	5576	Client.exe	90

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:3624
- 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:5964
- 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:5576
- - 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:1604

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/3624-0-0x00007FF85BE03000-0x00007FF85BE05000-memory.dmp

Filesize
8KB

Download
memory/3624-1-0x00000000007F0000-0x0000000000B14000-memory.dmp

Filesize
3.1MB

Download
memory/3624-2-0x00007FF85BE00000-0x00007FF85C8C1000-memory.dmp

Filesize
10.8MB

Download
memory/3624-8-0x00007FF85BE00000-0x00007FF85C8C1000-memory.dmp

Filesize
10.8MB

Download
memory/5576-9-0x00007FF85BE00000-0x00007FF85C8C1000-memory.dmp

Filesize
10.8MB

Download
memory/5576-10-0x00007FF85BE00000-0x00007FF85C8C1000-memory.dmp

Filesize
10.8MB

Download
memory/5576-11-0x000000001C7E0000-0x000000001C830000-memory.dmp

Filesize
320KB

Download
memory/5576-12-0x000000001C8F0000-0x000000001C9A2000-memory.dmp

Filesize
712KB

Download
memory/5576-13-0x00007FF85BE00000-0x00007FF85C8C1000-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