quasar | c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
29-05-2024 16:34

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General

Target

KR6nDu9fLhop1bFe.exe
Size

3.1MB
MD5

e3d628461d24faf2ad61e1305ed99542
SHA1

aefcdd93114397de51ce8f63e9ef96b65a5b5c11
SHA256

c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2
SHA512

20d47ef82c1dde83325d088c69ff9ae6f968b0a19d652f5ed2f21b1531c86fbf0b49e9df0d524c1333001c7565a8a56039aa31bb82ceba63c41b989dc8fcc991
SSDEEP

49152:xvSlL26AaNeWgPhlmVqvMQ7XSK0bLimzCCoGdITHHB72eh2NT:xvKL26AaNeWgPhlmVqkQ7XSK0bLz

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

31.177.108.29:4782

Mutex

553dcf2c-4c70-4c0c-935a-2e078a46f03e

Attributes

encryption_key
DAFF70D249B4EC619D5A052FDD3418E3549FF268
install_name
KR6nDu9fLhop1bFe.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Defender.Process
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/1544-1-0x0000000000390000-0x00000000006B4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1388 KR6nDu9fLhop1bFe.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

4732 schtasks.exe
2264 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

KR6nDu9fLhop1bFe.exeKR6nDu9fLhop1bFe.exe

description pid process

Token: SeDebugPrivilege 1544 KR6nDu9fLhop1bFe.exe
Token: SeDebugPrivilege 1388 KR6nDu9fLhop1bFe.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

KR6nDu9fLhop1bFe.exe

pid process

1388 KR6nDu9fLhop1bFe.exe

pid	process
1388	KR6nDu9fLhop1bFe.exe

pid	process
4732	schtasks.exe
2264	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1544	KR6nDu9fLhop1bFe.exe
Token: SeDebugPrivilege	1388	KR6nDu9fLhop1bFe.exe

pid	process
1388	KR6nDu9fLhop1bFe.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

KR6nDu9fLhop1bFe.exeKR6nDu9fLhop1bFe.exe

description	pid	process	target process
PID 1544 wrote to memory of 4732	1544	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1544 wrote to memory of 4732	1544	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1544 wrote to memory of 1388	1544	KR6nDu9fLhop1bFe.exe	KR6nDu9fLhop1bFe.exe
PID 1544 wrote to memory of 1388	1544	KR6nDu9fLhop1bFe.exe	KR6nDu9fLhop1bFe.exe
PID 1388 wrote to memory of 2264	1388	KR6nDu9fLhop1bFe.exe	schtasks.exe
PID 1388 wrote to memory of 2264	1388	KR6nDu9fLhop1bFe.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\KR6nDu9fLhop1bFe.exe
"C:\Users\Admin\AppData\Local\Temp\KR6nDu9fLhop1bFe.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1544

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4732

C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
"C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1388

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2264

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe

Filesize
3.1MB

MD5
e3d628461d24faf2ad61e1305ed99542

SHA1
aefcdd93114397de51ce8f63e9ef96b65a5b5c11

SHA256
c509ea51e44a654f104ab9fb8e5d681a871159c73fcf3f666245e303387329b2

SHA512
20d47ef82c1dde83325d088c69ff9ae6f968b0a19d652f5ed2f21b1531c86fbf0b49e9df0d524c1333001c7565a8a56039aa31bb82ceba63c41b989dc8fcc991

Download Submit
memory/1388-9-0x00007FFC9B8F0000-0x00007FFC9C3B1000-memory.dmp

Filesize
10.8MB

Download
memory/1388-11-0x00007FFC9B8F0000-0x00007FFC9C3B1000-memory.dmp

Filesize
10.8MB

Download
memory/1388-12-0x000000001B9C0000-0x000000001BA10000-memory.dmp

Filesize
320KB

Download
memory/1388-13-0x000000001BAD0000-0x000000001BB82000-memory.dmp

Filesize
712KB

Download
memory/1388-16-0x000000001BA70000-0x000000001BA82000-memory.dmp

Filesize
72KB

Download
memory/1388-17-0x000000001C5D0000-0x000000001C60C000-memory.dmp

Filesize
240KB

Download
memory/1388-18-0x00007FFC9B8F0000-0x00007FFC9C3B1000-memory.dmp

Filesize
10.8MB

Download
memory/1544-0-0x00007FFC9B8F3000-0x00007FFC9B8F5000-memory.dmp

Filesize
8KB

Download
memory/1544-1-0x0000000000390000-0x00000000006B4000-memory.dmp

Filesize
3.1MB

Download
memory/1544-2-0x00007FFC9B8F0000-0x00007FFC9C3B1000-memory.dmp

Filesize
10.8MB

Download
memory/1544-10-0x00007FFC9B8F0000-0x00007FFC9C3B1000-memory.dmp

Filesize
10.8MB

Download