quasar | a9c9bd256079b877e5b3f85d26312900ce865127e7d91e809ad745b306ab6a76

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01-01-2025 23:15

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General

Target

Client-built.exe
Size

3.1MB
MD5

351640042c68134bc37147809e764934
SHA1

d56befbdb75ad0592151d38ff5c9dc746ec4e22f
SHA256

a9c9bd256079b877e5b3f85d26312900ce865127e7d91e809ad745b306ab6a76
SHA512

250caa5035b6283e6ddabb4b37a73c127266864913d98a271d5800327cd83817fb0cdbc52723e78e69f04b6f4e9aa5f4d477c173a3021bcc7ddec8fd3b6ff532
SSDEEP

49152:Dv3I22SsaNYfdPBldt698dBcjHhiukDvJ9IoGdS1THHB72eh2NT:Dv422SsaNYfdPBldt6+dBcjHXkgC

Score

10^/10

quasar first spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

first

ZyloX-52247.portmap.host:4782

Mutex

44382739-6e8e-4a03-b838-6ed9f8f4bf36

Attributes

encryption_key
59DD70006F5E5424ACBA442199524AA9815F439E
install_name
Calculator.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RtkAudUService86
subdirectory
Calculator_UWP

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/2140-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b93-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1552	Calculator.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

pid	Process
3188	schtasks.exe
4464	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2140	Client-built.exe
Token: SeDebugPrivilege	1552	Calculator.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1552	Calculator.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1552	Calculator.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2140 wrote to memory of 4464	2140	Client-built.exe	83
PID 2140 wrote to memory of 4464	2140	Client-built.exe	83
PID 2140 wrote to memory of 1552	2140	Client-built.exe	85
PID 2140 wrote to memory of 1552	2140	Client-built.exe	85
PID 1552 wrote to memory of 3188	1552	Calculator.exe	86
PID 1552 wrote to memory of 3188	1552	Calculator.exe	86

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:2140
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4464
- C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe
  "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:1552
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "RtkAudUService86" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Calculator_UWP\Calculator.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3188

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\Calculator_UWP\Calculator.exe

Filesize
3.1MB

MD5
351640042c68134bc37147809e764934

SHA1
d56befbdb75ad0592151d38ff5c9dc746ec4e22f

SHA256
a9c9bd256079b877e5b3f85d26312900ce865127e7d91e809ad745b306ab6a76

SHA512
250caa5035b6283e6ddabb4b37a73c127266864913d98a271d5800327cd83817fb0cdbc52723e78e69f04b6f4e9aa5f4d477c173a3021bcc7ddec8fd3b6ff532

Download Submit
memory/1552-9-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/1552-10-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/1552-11-0x000000001C390000-0x000000001C3E0000-memory.dmp

Filesize
320KB

Download
memory/1552-12-0x000000001C4A0000-0x000000001C552000-memory.dmp

Filesize
712KB

Download
memory/1552-13-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/2140-0-0x00007FFA81103000-0x00007FFA81105000-memory.dmp

Filesize
8KB

Download
memory/2140-1-0x0000000000EA0000-0x00000000011C4000-memory.dmp

Filesize
3.1MB

Download
memory/2140-2-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/2140-8-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads