quasar | 9b906e8b6e09cdb3ad9d100dcb77df6f30e0a88c1fb164ea491a9e6fdd823083

Resubmissions

29-05-2024 04:02

240529-el419aaf63 10

29-05-2024 03:57

240529-eh157aae65 10

Analysis

max time kernel
147s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
29-05-2024 04:02

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General

Target

Client-built.exe
Size

3.1MB
MD5

edd373e0c5b33b63857417fe30229b22
SHA1

fd1834882a6c411b97a51f2e1ddb57058465fdc3
SHA256

9b906e8b6e09cdb3ad9d100dcb77df6f30e0a88c1fb164ea491a9e6fdd823083
SHA512

80ffb0dfe71ca3bc6e7b414d2ba8924a99e481e36aadbc9a176571d121556637fa50621509886030959dd48e6419d0fe4f3c20ce56a304912c5259d8fd0dd9d5
SSDEEP

49152:+vSI22SsaNYfdPBldt698dBcjHdExk1v4LoG+8GQ0THHB72eh2NT:+v/22SsaNYfdPBldt6+dBcjHdExnG

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.0.5:55976

127.0.0.1:12995

Mutex

fd7766f9-01b8-4f7d-9510-71226643b102

Attributes

encryption_key
1A0BB6F7E6C51A39D122080A266E59E4C6D10FA8
install_name
Centixwareinstaller.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows 11 Dir
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4864-1-0x0000000000A40000-0x0000000000D64000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Centixwareinstaller.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Centixwareinstaller.exe

pid process

4452 Centixwareinstaller.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

1484 schtasks.exe
1508 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeCentixwareinstaller.exe

description pid process

Token: SeDebugPrivilege 4864 Client-built.exe
Token: SeDebugPrivilege 4452 Centixwareinstaller.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Centixwareinstaller.exe

pid process

4452 Centixwareinstaller.exe

pid	process
4452	Centixwareinstaller.exe

pid	process
1484	schtasks.exe
1508	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4864	Client-built.exe
Token: SeDebugPrivilege	4452	Centixwareinstaller.exe

pid	process
4452	Centixwareinstaller.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeCentixwareinstaller.exe

description	pid	process	target process
PID 4864 wrote to memory of 1484	4864	Client-built.exe	schtasks.exe
PID 4864 wrote to memory of 1484	4864	Client-built.exe	schtasks.exe
PID 4864 wrote to memory of 4452	4864	Client-built.exe	Centixwareinstaller.exe
PID 4864 wrote to memory of 4452	4864	Client-built.exe	Centixwareinstaller.exe
PID 4452 wrote to memory of 1508	4452	Centixwareinstaller.exe	schtasks.exe
PID 4452 wrote to memory of 1508	4452	Centixwareinstaller.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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4864

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows 11 Dir" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Centixwareinstaller.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1484

C:\Users\Admin\AppData\Roaming\SubDir\Centixwareinstaller.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Centixwareinstaller.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4452

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows 11 Dir" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Centixwareinstaller.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:1508

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:\Users\Admin\AppData\Roaming\SubDir\Centixwareinstaller.exe
Filesize
3.1MB

MD5
edd373e0c5b33b63857417fe30229b22

SHA1
fd1834882a6c411b97a51f2e1ddb57058465fdc3

SHA256
9b906e8b6e09cdb3ad9d100dcb77df6f30e0a88c1fb164ea491a9e6fdd823083

SHA512
80ffb0dfe71ca3bc6e7b414d2ba8924a99e481e36aadbc9a176571d121556637fa50621509886030959dd48e6419d0fe4f3c20ce56a304912c5259d8fd0dd9d5

Download Submit
memory/4452-10-0x00007FFDEFC30000-0x00007FFDF06F2000-memory.dmp

Filesize
10.8MB

Download
memory/4452-11-0x00007FFDEFC30000-0x00007FFDF06F2000-memory.dmp

Filesize
10.8MB

Download
memory/4452-12-0x000000001CAB0000-0x000000001CB00000-memory.dmp

Filesize
320KB

Download
memory/4452-13-0x000000001CBC0000-0x000000001CC72000-memory.dmp

Filesize
712KB

Download
memory/4452-14-0x00007FFDEFC30000-0x00007FFDF06F2000-memory.dmp

Filesize
10.8MB

Download
memory/4452-15-0x00007FFDEFC30000-0x00007FFDF06F2000-memory.dmp

Filesize
10.8MB

Download
memory/4864-0-0x00007FFDEFC33000-0x00007FFDEFC35000-memory.dmp

Filesize
8KB

Download
memory/4864-1-0x0000000000A40000-0x0000000000D64000-memory.dmp

Filesize
3.1MB

Download
memory/4864-2-0x00007FFDEFC30000-0x00007FFDF06F2000-memory.dmp

Filesize
10.8MB

Download
memory/4864-9-0x00007FFDEFC30000-0x00007FFDF06F2000-memory.dmp

Filesize
10.8MB

Download