quasar | 98b29ab07038ed53a9842ae6d9cf0991f0ce4ac54036ce5b703ef441be70b797

Analysis

max time kernel
127s
max time network
144s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
31-10-2024 06:43

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General

Target

Client-built2.exe
Size

3.1MB
MD5

600063adc2e3df654e26b40d7fcd5252
SHA1

03abd84e486da6ecdcc9f1acd5f89f0c5026daab
SHA256

98b29ab07038ed53a9842ae6d9cf0991f0ce4ac54036ce5b703ef441be70b797
SHA512

f4075584ec0a4ba56d4292b3f7d80ed6f4fc02c143a7e521e0c1838e1115870ca1e5f1ec2f6948d18c914da0ea5ed9dcac765382943a74683eed2deed57365ac
SSDEEP

49152:bv3lL26AaNeWgPhlmVqvMQ7XSKTlRJ6QbR3LoGdydyTHHB72eh2NT:bv1L26AaNeWgPhlmVqkQ7XSKTlRJ6qA

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.127.0.200:4782

Mutex

fffe048b-d25a-4851-bd46-4583f63bcae9

Attributes

encryption_key
433895AE7B4C5D8EF94D36D167293A1C1914DBFB
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 family
quasar

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/3172-1-0x0000000000A90000-0x0000000000DB4000-memory.dmp	family_quasar
behavioral1/files/0x002900000004504c-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
1124	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
744	schtasks.exe
1284	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built2.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	3172	Client-built2.exe
Token: SeDebugPrivilege	1124	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
1124	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
1124	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built2.exeClient.exe

description	pid	Process	procid_target
PID 3172 wrote to memory of 744	3172	Client-built2.exe	82
PID 3172 wrote to memory of 744	3172	Client-built2.exe	82
PID 3172 wrote to memory of 1124	3172	Client-built2.exe	84
PID 3172 wrote to memory of 1124	3172	Client-built2.exe	84
PID 1124 wrote to memory of 1284	1124	Client.exe	87
PID 1124 wrote to memory of 1284	1124	Client.exe	87

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-built2.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built2.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3172
- 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:744
- 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 WriteProcessMemory
  PID:1124
- - 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:1284

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
600063adc2e3df654e26b40d7fcd5252

SHA1
03abd84e486da6ecdcc9f1acd5f89f0c5026daab

SHA256
98b29ab07038ed53a9842ae6d9cf0991f0ce4ac54036ce5b703ef441be70b797

SHA512
f4075584ec0a4ba56d4292b3f7d80ed6f4fc02c143a7e521e0c1838e1115870ca1e5f1ec2f6948d18c914da0ea5ed9dcac765382943a74683eed2deed57365ac

Download Submit
memory/1124-6-0x00007FF8F12D0000-0x00007FF8F1D92000-memory.dmp

Filesize
10.8MB

Download
memory/1124-7-0x00007FF8F12D0000-0x00007FF8F1D92000-memory.dmp

Filesize
10.8MB

Download
memory/1124-8-0x000000001CBE0000-0x000000001CC30000-memory.dmp

Filesize
320KB

Download
memory/1124-9-0x000000001CCF0000-0x000000001CDA2000-memory.dmp

Filesize
712KB

Download
memory/1124-10-0x00007FF8F12D0000-0x00007FF8F1D92000-memory.dmp

Filesize
10.8MB

Download
memory/3172-0-0x00007FF8F12D3000-0x00007FF8F12D5000-memory.dmp

Filesize
8KB

Download
memory/3172-1-0x0000000000A90000-0x0000000000DB4000-memory.dmp

Filesize
3.1MB

Download
memory/3172-2-0x00007FF8F12D0000-0x00007FF8F1D92000-memory.dmp

Filesize
10.8MB

Download
memory/3172-5-0x00007FF8F12D0000-0x00007FF8F1D92000-memory.dmp

Filesize
10.8MB

Download