quasar | 740eae2194c61a026196e3e6e0ebd629d4b876f8e591fdfd0b662878a86546e0

Analysis

max time kernel
136s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
01-06-2024 13:32

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General

Target

image_logger.exe
Size

3.1MB
MD5

87548af645ae05d1270e35bab6c7180c
SHA1

186758774e90f0f88537a2223f2919cce582a3b3
SHA256

740eae2194c61a026196e3e6e0ebd629d4b876f8e591fdfd0b662878a86546e0
SHA512

9e36a35d7c96f78401331d47f17a7dc127ffcf254c748f93f1fba41c91aa8886dd305a97d54acf743576659143b534af174adcd0625f10e03b931ba42c234604
SSDEEP

49152:rvXI22SsaNYfdPBldt698dBcjHRpRJ6sbR3LoGdJqTHHB72eh2NT:rvY22SsaNYfdPBldt6+dBcjHRpRJ62Z

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.146:4782

Mutex

34162b02-2762-4654-b588-2cfc3f9d49d6

Attributes

encryption_key
53AE412E3C7FE26F176F4B85B9D37FEA82C46128
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 payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3568-1-0x00000000001F0000-0x0000000000514000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

560 Client.exe

pid	process
560	Client.exe

Drops file in System32 directory 5 IoCs

Processes:

image_logger.exeClient.exe

description	ioc	process
File created	C:\Windows\system32\SubDir\Client.exe	image_logger.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	image_logger.exe
File opened for modification	C:\Windows\system32\SubDir	image_logger.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1676 schtasks.exe
4776 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

image_logger.exeClient.exe

description pid process

Token: SeDebugPrivilege 3568 image_logger.exe
Token: SeDebugPrivilege 560 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

560 Client.exe

pid	process
1676	schtasks.exe
4776	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3568	image_logger.exe
Token: SeDebugPrivilege	560	Client.exe

pid	process
560	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

image_logger.exeClient.exe

description	pid	process	target process
PID 3568 wrote to memory of 1676	3568	image_logger.exe	schtasks.exe
PID 3568 wrote to memory of 1676	3568	image_logger.exe	schtasks.exe
PID 3568 wrote to memory of 560	3568	image_logger.exe	Client.exe
PID 3568 wrote to memory of 560	3568	image_logger.exe	Client.exe
PID 560 wrote to memory of 4776	560	Client.exe	schtasks.exe
PID 560 wrote to memory of 4776	560	Client.exe	schtasks.exe

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\image_logger.exe
"C:\Users\Admin\AppData\Local\Temp\image_logger.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3568

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1676

C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:560

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4776

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Windows\System32\SubDir\Client.exe
Filesize
3.1MB

MD5
87548af645ae05d1270e35bab6c7180c

SHA1
186758774e90f0f88537a2223f2919cce582a3b3

SHA256
740eae2194c61a026196e3e6e0ebd629d4b876f8e591fdfd0b662878a86546e0

SHA512
9e36a35d7c96f78401331d47f17a7dc127ffcf254c748f93f1fba41c91aa8886dd305a97d54acf743576659143b534af174adcd0625f10e03b931ba42c234604

Download Submit
memory/560-10-0x00007FFF4ABA0000-0x00007FFF4B661000-memory.dmp

Filesize
10.8MB

Download
memory/560-11-0x00007FFF4ABA0000-0x00007FFF4B661000-memory.dmp

Filesize
10.8MB

Download
memory/560-12-0x000000001B0A0000-0x000000001B0F0000-memory.dmp

Filesize
320KB

Download
memory/560-13-0x000000001B9B0000-0x000000001BA62000-memory.dmp

Filesize
712KB

Download
memory/560-14-0x00007FFF4ABA0000-0x00007FFF4B661000-memory.dmp

Filesize
10.8MB

Download
memory/3568-0-0x00007FFF4ABA3000-0x00007FFF4ABA5000-memory.dmp

Filesize
8KB

Download
memory/3568-1-0x00000000001F0000-0x0000000000514000-memory.dmp

Filesize
3.1MB

Download
memory/3568-2-0x00007FFF4ABA0000-0x00007FFF4B661000-memory.dmp

Filesize
10.8MB

Download
memory/3568-9-0x00007FFF4ABA0000-0x00007FFF4B661000-memory.dmp

Filesize
10.8MB

Download