quasar | 4406fc9a225a2f82d1fbb49d68bf6c37699acaa67606dbe6c9f87387f1f98522

Analysis

max time kernel
1036s
max time network
1044s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
09/11/2024, 05:47

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General

Target

Client-built2.exe
Size

3.1MB
MD5

153e0586ce82c8d58861ee71ccfd5709
SHA1

6144cf2b6591e81d7bb1e427864ad5b2cec25655
SHA256

4406fc9a225a2f82d1fbb49d68bf6c37699acaa67606dbe6c9f87387f1f98522
SHA512

3e4e6f1b4278dd08eb1b3ea2fe66ab7674815500658c5d01ba353b679d0895fb852148527a5f622f2e484d2e9e335033d00b8c49673545bb2daecae73b435ca5
SSDEEP

49152:PvyI22SsaNYfdPBldt698dBcjH8VPhb1JpjoGdKTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjH8VPhd

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

190.104.116.8:4782

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/2280-1-0x0000000000550000-0x0000000000874000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045050-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1436	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
216	schtasks.exe
1428	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2280	Client-built2.exe
Token: SeDebugPrivilege	1436	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1436	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 216	2280	Client-built2.exe	84
PID 2280 wrote to memory of 216	2280	Client-built2.exe	84
PID 2280 wrote to memory of 1436	2280	Client-built2.exe	86
PID 2280 wrote to memory of 1436	2280	Client-built2.exe	86
PID 1436 wrote to memory of 1428	1436	Client.exe	87
PID 1436 wrote to memory of 1428	1436	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:2280
- 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:216
- 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:1436
- - 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:1428

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
153e0586ce82c8d58861ee71ccfd5709

SHA1
6144cf2b6591e81d7bb1e427864ad5b2cec25655

SHA256
4406fc9a225a2f82d1fbb49d68bf6c37699acaa67606dbe6c9f87387f1f98522

SHA512
3e4e6f1b4278dd08eb1b3ea2fe66ab7674815500658c5d01ba353b679d0895fb852148527a5f622f2e484d2e9e335033d00b8c49673545bb2daecae73b435ca5

Download Submit
memory/1436-5-0x00007FF925CE0000-0x00007FF9267A2000-memory.dmp

Filesize
10.8MB

Download
memory/1436-6-0x00007FF925CE0000-0x00007FF9267A2000-memory.dmp

Filesize
10.8MB

Download
memory/1436-7-0x0000000003480000-0x00000000034D0000-memory.dmp

Filesize
320KB

Download
memory/1436-8-0x000000001D4B0000-0x000000001D562000-memory.dmp

Filesize
712KB

Download
memory/1436-10-0x00007FF925CE0000-0x00007FF9267A2000-memory.dmp

Filesize
10.8MB

Download
memory/2280-0-0x00007FF925CE3000-0x00007FF925CE5000-memory.dmp

Filesize
8KB

Download
memory/2280-1-0x0000000000550000-0x0000000000874000-memory.dmp

Filesize
3.1MB

Download
memory/2280-2-0x00007FF925CE0000-0x00007FF9267A2000-memory.dmp

Filesize
10.8MB

Download
memory/2280-9-0x00007FF925CE0000-0x00007FF9267A2000-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