quasar | 27a22a9fb85f83dbb20e7092149972adbc51a4dd15e044d6e020fe8da782fca6

Analysis

max time kernel
126s
max time network
135s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
23-06-2024 02:53

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General

Target

Client-built.exe
Size

3.1MB
MD5

0a9c32e636ea546c60b8af765bce1f80
SHA1

8597de6e52628bb8817c25214c5a025e8d35d43e
SHA256

27a22a9fb85f83dbb20e7092149972adbc51a4dd15e044d6e020fe8da782fca6
SHA512

74b624d1bd21b4d8df5295eec7b8f9b0b535362ceb28f91c557c4fc218de904ed6541a17ff990e36cc28d7283fce525bccb49ecbc26f932bd53ebe3e767a5a7c
SSDEEP

49152:rvbI22SsaNYfdPBldt698dBcjH8Pe2EGaBk/uhNoGdIgTHHB72eh2NT:rvk22SsaNYfdPBldt6+dBcjH8PePL

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.1:8096

Mutex

a63960a8-6945-4928-849a-0eae3d19431a

Attributes

encryption_key
1E5FEC53491F397A647C164995877CF2E1897DD5
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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2864-1-0x0000000000250000-0x0000000000574000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2532-8-0x0000000000840000-0x0000000000B64000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2532 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

Processes:

schtasks.exeschtasks.exe

pid process

1768 schtasks.exe
2888 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2864 Client-built.exe
Token: SeDebugPrivilege 2532 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

2532 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

2532 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2532 Client.exe

pid	process
2532	Client.exe

pid	process
1768	schtasks.exe
2888	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2864	Client-built.exe
Token: SeDebugPrivilege	2532	Client.exe

pid	process
2532	Client.exe

pid	process
2532	Client.exe

pid	process
2532	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2864 wrote to memory of 1768	2864	Client-built.exe	schtasks.exe
PID 2864 wrote to memory of 1768	2864	Client-built.exe	schtasks.exe
PID 2864 wrote to memory of 1768	2864	Client-built.exe	schtasks.exe
PID 2864 wrote to memory of 2532	2864	Client-built.exe	Client.exe
PID 2864 wrote to memory of 2532	2864	Client-built.exe	Client.exe
PID 2864 wrote to memory of 2532	2864	Client-built.exe	Client.exe
PID 2532 wrote to memory of 2888	2532	Client.exe	schtasks.exe
PID 2532 wrote to memory of 2888	2532	Client.exe	schtasks.exe
PID 2532 wrote to memory of 2888	2532	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2864

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:1768

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:2532

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2888

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

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

MD5
0a9c32e636ea546c60b8af765bce1f80

SHA1
8597de6e52628bb8817c25214c5a025e8d35d43e

SHA256
27a22a9fb85f83dbb20e7092149972adbc51a4dd15e044d6e020fe8da782fca6

SHA512
74b624d1bd21b4d8df5295eec7b8f9b0b535362ceb28f91c557c4fc218de904ed6541a17ff990e36cc28d7283fce525bccb49ecbc26f932bd53ebe3e767a5a7c

Download Submit
memory/2532-7-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2532-10-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2532-8-0x0000000000840000-0x0000000000B64000-memory.dmp

Filesize
3.1MB

Download
memory/2532-11-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2864-0-0x000007FEF5A53000-0x000007FEF5A54000-memory.dmp

Filesize
4KB

Download
memory/2864-1-0x0000000000250000-0x0000000000574000-memory.dmp

Filesize
3.1MB

Download
memory/2864-2-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2864-9-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download