quasar | 71db00e41487326acc2eb737a22faa26011d78ba242c408b108b0f7b8124b9f0

Analysis

max time kernel
149s
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 23:18

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General

Target

Client-built.exe
Size

3.1MB
MD5

00cafff0e897b2ac4d0bb4ea8171f87a
SHA1

fa6224090a7a53f328f7bf74072776ce991f01bb
SHA256

71db00e41487326acc2eb737a22faa26011d78ba242c408b108b0f7b8124b9f0
SHA512

d4fb8277d5b48176542f318eaf9f202a12cc8a3a3bc825245bcda73ea78c6e4c2d6be2013901e5cb1c369f8eb86934bb4990781fd7b60681928e447761cc6979
SSDEEP

49152:7v3lL26AaNeWgPhlmVqvMQ7XSKQERJ6BbR3LoGd6THHB72eh2NT:7v1L26AaNeWgPhlmVqkQ7XSKQERJ6j

Score

10^/10

quasar first spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

first

quasartestingxxx.hopto.org: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/4812-1-0x0000000000F40000-0x0000000001264000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cd5-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3664	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
2380	schtasks.exe
928	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4812	Client-built.exe
Token: SeDebugPrivilege	3664	Calculator.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3664	Calculator.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3664	Calculator.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4812 wrote to memory of 2380	4812	Client-built.exe	83
PID 4812 wrote to memory of 2380	4812	Client-built.exe	83
PID 4812 wrote to memory of 3664	4812	Client-built.exe	85
PID 4812 wrote to memory of 3664	4812	Client-built.exe	85
PID 3664 wrote to memory of 928	3664	Calculator.exe	86
PID 3664 wrote to memory of 928	3664	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:4812
- 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:2380
- 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:3664
- - 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:928

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
00cafff0e897b2ac4d0bb4ea8171f87a

SHA1
fa6224090a7a53f328f7bf74072776ce991f01bb

SHA256
71db00e41487326acc2eb737a22faa26011d78ba242c408b108b0f7b8124b9f0

SHA512
d4fb8277d5b48176542f318eaf9f202a12cc8a3a3bc825245bcda73ea78c6e4c2d6be2013901e5cb1c369f8eb86934bb4990781fd7b60681928e447761cc6979

Download Submit
memory/3664-8-0x00007FFECECA0000-0x00007FFECF761000-memory.dmp

Filesize
10.8MB

Download
memory/3664-10-0x00007FFECECA0000-0x00007FFECF761000-memory.dmp

Filesize
10.8MB

Download
memory/3664-11-0x000000001C6B0000-0x000000001C700000-memory.dmp

Filesize
320KB

Download
memory/3664-12-0x000000001C7C0000-0x000000001C872000-memory.dmp

Filesize
712KB

Download
memory/3664-13-0x00007FFECECA0000-0x00007FFECF761000-memory.dmp

Filesize
10.8MB

Download
memory/4812-0-0x00007FFECECA3000-0x00007FFECECA5000-memory.dmp

Filesize
8KB

Download
memory/4812-1-0x0000000000F40000-0x0000000001264000-memory.dmp

Filesize
3.1MB

Download
memory/4812-2-0x00007FFECECA0000-0x00007FFECF761000-memory.dmp

Filesize
10.8MB

Download
memory/4812-9-0x00007FFECECA0000-0x00007FFECF761000-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