quasar | 0b77aec2b160e1f0923ff76418957b6c8fd5a7fde0b05a646ea7f490d38952fa

Analysis

max time kernel
127s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08-12-2024 10:23

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General

Target

Installer.exe
Size

3.1MB
MD5

2a7c50b498cf2eee0087b6de22b4418e
SHA1

6b4bece2654caa22ef1971ee741a8171dddb235f
SHA256

0b77aec2b160e1f0923ff76418957b6c8fd5a7fde0b05a646ea7f490d38952fa
SHA512

75c6c5557cc64afef8d2ac00b2e5311150db7eb116f18d938bcf7f9eaaeb7eb6d9f8154c65e37aa491ff2da93ae0b2fc1fcc9603008c894a6985908750a6f279
SSDEEP

49152:yvyI22SsaNYfdPBldt698dBcjHUhO9Z22pjk/ZLoGd9THHB72eh2NT:yvf22SsaNYfdPBldt6+dBcjHsO9k

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

169.254.206.74:4782

Mutex

b8cc8406-b5a4-4490-93df-e418a88c060c

Attributes

encryption_key
3D90BE0A223C8097DFDC3ED53A2C96D99F6FCD41
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

resource	yara_rule
behavioral2/memory/1732-1-0x0000000000570000-0x0000000000894000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b80-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1960	Client.exe

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
3084	schtasks.exe
1480	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1732	Installer.exe
Token: SeDebugPrivilege	1960	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1960	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 3084	1732	Installer.exe	82
PID 1732 wrote to memory of 3084	1732	Installer.exe	82
PID 1732 wrote to memory of 1960	1732	Installer.exe	84
PID 1732 wrote to memory of 1960	1732	Installer.exe	84
PID 1960 wrote to memory of 1480	1960	Client.exe	85
PID 1960 wrote to memory of 1480	1960	Client.exe	85

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\Installer.exe
"C:\Users\Admin\AppData\Local\Temp\Installer.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1732
- 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:3084
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1960
- - 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:1480

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

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
2a7c50b498cf2eee0087b6de22b4418e

SHA1
6b4bece2654caa22ef1971ee741a8171dddb235f

SHA256
0b77aec2b160e1f0923ff76418957b6c8fd5a7fde0b05a646ea7f490d38952fa

SHA512
75c6c5557cc64afef8d2ac00b2e5311150db7eb116f18d938bcf7f9eaaeb7eb6d9f8154c65e37aa491ff2da93ae0b2fc1fcc9603008c894a6985908750a6f279

Download Submit
memory/1732-0-0x00007FFD55DD3000-0x00007FFD55DD5000-memory.dmp

Filesize
8KB

Download
memory/1732-1-0x0000000000570000-0x0000000000894000-memory.dmp

Filesize
3.1MB

Download
memory/1732-2-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

Filesize
10.8MB

Download
memory/1732-9-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

Filesize
10.8MB

Download
memory/1960-10-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

Filesize
10.8MB

Download
memory/1960-11-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

Filesize
10.8MB

Download
memory/1960-12-0x000000001BD40000-0x000000001BD90000-memory.dmp

Filesize
320KB

Download
memory/1960-13-0x000000001DBC0000-0x000000001DC72000-memory.dmp

Filesize
712KB

Download
memory/1960-14-0x00007FFD55DD0000-0x00007FFD56891000-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