quasar | 72779331ccef1ecb19122b72a2a2745b2c6f46d3b2f811d6cdfd361969408b13

Analysis

max time kernel
149s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
05-12-2024 22:49

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General

Target

Client-built.exe
Size

3.2MB
MD5

8bb05d28fb2de6c00e4f9237cb9d3ce9
SHA1

14507bff45cf98227291084caf8d2994027e4d91
SHA256

72779331ccef1ecb19122b72a2a2745b2c6f46d3b2f811d6cdfd361969408b13
SHA512

cb28635b80bd62974559a3983f97e693b07d0b98c2ea7c4f88a7f51299500689f08dd47953e9550c206021b9779f3676920416962d7a07594e2c10a5e717e782
SSDEEP

49152:Yvht62XlaSFNWPjljiFa2RoUYI9cUZxoGtvAoTHHB72eh2NTx:YvL62XlaSFNWPjljiFXRoUYI9cw3

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.208.1:4782

Mutex

3f84c085-3a8d-4b82-9872-c704d7977ad0

Attributes

encryption_key
69B752FA4F70AC7EF5AE67EAE90277065B69315A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Exam
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/1236-1-0x0000000000C30000-0x0000000000F60000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b95-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4092	Client.exe

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
1848	schtasks.exe
2104	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1236	Client-built.exe
Token: SeDebugPrivilege	4092	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4092	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4092	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4092	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1236 wrote to memory of 1848	1236	Client-built.exe	83
PID 1236 wrote to memory of 1848	1236	Client-built.exe	83
PID 1236 wrote to memory of 4092	1236	Client-built.exe	85
PID 1236 wrote to memory of 4092	1236	Client-built.exe	85
PID 4092 wrote to memory of 2104	4092	Client.exe	86
PID 4092 wrote to memory of 2104	4092	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:1236
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Exam" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1848
- 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:4092
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Exam" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2104

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.2MB

MD5
8bb05d28fb2de6c00e4f9237cb9d3ce9

SHA1
14507bff45cf98227291084caf8d2994027e4d91

SHA256
72779331ccef1ecb19122b72a2a2745b2c6f46d3b2f811d6cdfd361969408b13

SHA512
cb28635b80bd62974559a3983f97e693b07d0b98c2ea7c4f88a7f51299500689f08dd47953e9550c206021b9779f3676920416962d7a07594e2c10a5e717e782

Download Submit
memory/1236-0-0x00007FFBC2933000-0x00007FFBC2935000-memory.dmp

Filesize
8KB

Download
memory/1236-1-0x0000000000C30000-0x0000000000F60000-memory.dmp

Filesize
3.2MB

Download
memory/1236-2-0x00007FFBC2930000-0x00007FFBC33F1000-memory.dmp

Filesize
10.8MB

Download
memory/1236-9-0x00007FFBC2930000-0x00007FFBC33F1000-memory.dmp

Filesize
10.8MB

Download
memory/4092-10-0x00007FFBC2930000-0x00007FFBC33F1000-memory.dmp

Filesize
10.8MB

Download
memory/4092-11-0x00007FFBC2930000-0x00007FFBC33F1000-memory.dmp

Filesize
10.8MB

Download
memory/4092-12-0x000000001B680000-0x000000001B6D0000-memory.dmp

Filesize
320KB

Download
memory/4092-13-0x000000001BEA0000-0x000000001BF52000-memory.dmp

Filesize
712KB

Download
memory/4092-14-0x00007FFBC2930000-0x00007FFBC33F1000-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