quasar | 48d94bfa639ca4fd947e3fda203ccc16e3bb85761e11a0428f563753374de0ff

Analysis

max time kernel
624s
max time network
628s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
06/11/2024, 07:37

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General

Target

Probemos.exe
Size

3.1MB
MD5

b4710cbc23ac3cca2e21b2d28e7c91c7
SHA1

0fdfaa530d55fab75c9dbb4452ace1c1f31deda0
SHA256

48d94bfa639ca4fd947e3fda203ccc16e3bb85761e11a0428f563753374de0ff
SHA512

c6663f8dca6cf42364b7ba711355b714423ee52635754a5ab8f8973cf6edefb0e2fcd9ed83299dc036fa4b6514ec4233a52c887b98b1c9bbbf0c837a258f7535
SSDEEP

49152:Dv+lL26AaNeWgPhlmVqvMQ7XSKWMYoybRALoGdeXTHHB72eh2NT:DvuL26AaNeWgPhlmVqkQ7XSKWXoNu

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

AdanFlores3912-54860.portmap.host:54860

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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
behavioral1/memory/2776-1-0x0000000000A90000-0x0000000000DB4000-memory.dmp	family_quasar
behavioral1/files/0x00280000000450a1-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
32	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
2940	schtasks.exe
4328	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2776	Probemos.exe
Token: SeDebugPrivilege	32	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
32	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2776 wrote to memory of 2940	2776	Probemos.exe	82
PID 2776 wrote to memory of 2940	2776	Probemos.exe	82
PID 2776 wrote to memory of 32	2776	Probemos.exe	84
PID 2776 wrote to memory of 32	2776	Probemos.exe	84
PID 32 wrote to memory of 4328	32	Client.exe	85
PID 32 wrote to memory of 4328	32	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\Probemos.exe
"C:\Users\Admin\AppData\Local\Temp\Probemos.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2776
- 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:2940
- 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:32
- - 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:4328

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
b4710cbc23ac3cca2e21b2d28e7c91c7

SHA1
0fdfaa530d55fab75c9dbb4452ace1c1f31deda0

SHA256
48d94bfa639ca4fd947e3fda203ccc16e3bb85761e11a0428f563753374de0ff

SHA512
c6663f8dca6cf42364b7ba711355b714423ee52635754a5ab8f8973cf6edefb0e2fcd9ed83299dc036fa4b6514ec4233a52c887b98b1c9bbbf0c837a258f7535

Download Submit
memory/32-6-0x00007FFBE4530000-0x00007FFBE4FF2000-memory.dmp

Filesize
10.8MB

Download
memory/32-7-0x00007FFBE4530000-0x00007FFBE4FF2000-memory.dmp

Filesize
10.8MB

Download
memory/32-8-0x000000001C4F0000-0x000000001C540000-memory.dmp

Filesize
320KB

Download
memory/32-9-0x000000001C600000-0x000000001C6B2000-memory.dmp

Filesize
712KB

Download
memory/32-12-0x000000001C5A0000-0x000000001C5B2000-memory.dmp

Filesize
72KB

Download
memory/32-13-0x000000001D200000-0x000000001D23C000-memory.dmp

Filesize
240KB

Download
memory/32-14-0x00007FFBE4530000-0x00007FFBE4FF2000-memory.dmp

Filesize
10.8MB

Download
memory/2776-0-0x00007FFBE4533000-0x00007FFBE4535000-memory.dmp

Filesize
8KB

Download
memory/2776-1-0x0000000000A90000-0x0000000000DB4000-memory.dmp

Filesize
3.1MB

Download
memory/2776-2-0x00007FFBE4530000-0x00007FFBE4FF2000-memory.dmp

Filesize
10.8MB

Download
memory/2776-5-0x00007FFBE4530000-0x00007FFBE4FF2000-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