quasar | f8f2be9448bb64d2d67b6b9f724e5668a1584831aece7d49f9956b283aca77be

Analysis

max time kernel
126s
max time network
146s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
31-10-2024 06:47

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General

Target

Client-built3.exe
Size

3.1MB
MD5

0ba12b4cf0e785325ef57b8addc70899
SHA1

6ebc9ef072f738e0d89a286f08e359ceacff0095
SHA256

f8f2be9448bb64d2d67b6b9f724e5668a1584831aece7d49f9956b283aca77be
SHA512

5badb694a5318058f8d016258bc8c50886e8ebf753b97a95116dfb66e39061297ede0228aa9fa95b3f0614d70326aafb0f8bad4318993ef05f288e4a249a6889
SSDEEP

49152:WvcG42pda6D+/PjlLOlg6yQipVnVmcmzgHoGdMTHHB72eh2NT:Wvn42pda6D+/PjlLOlZyQipVnVm2

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.127.0.200:4782

Mutex

fffe048b-d25a-4851-bd46-4583f63bcae9

Attributes

encryption_key
433895AE7B4C5D8EF94D36D167293A1C1914DBFB
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

Processes:

resource	yara_rule
behavioral1/memory/2156-1-0x00000000007C0000-0x0000000000AE4000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045039-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
2260	Client.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

Processes:

schtasks.exeschtasks.exe

pid	Process
788	schtasks.exe
2288	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built3.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2156	Client-built3.exe
Token: SeDebugPrivilege	2260	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
2260	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
2260	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built3.exeClient.exe

description	pid	Process	procid_target
PID 2156 wrote to memory of 788	2156	Client-built3.exe	85
PID 2156 wrote to memory of 788	2156	Client-built3.exe	85
PID 2156 wrote to memory of 2260	2156	Client-built3.exe	87
PID 2156 wrote to memory of 2260	2156	Client-built3.exe	87
PID 2260 wrote to memory of 2288	2260	Client.exe	88
PID 2260 wrote to memory of 2288	2260	Client.exe	88

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-built3.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built3.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2156
- 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:788
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2260
- - 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:2288

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
0ba12b4cf0e785325ef57b8addc70899

SHA1
6ebc9ef072f738e0d89a286f08e359ceacff0095

SHA256
f8f2be9448bb64d2d67b6b9f724e5668a1584831aece7d49f9956b283aca77be

SHA512
5badb694a5318058f8d016258bc8c50886e8ebf753b97a95116dfb66e39061297ede0228aa9fa95b3f0614d70326aafb0f8bad4318993ef05f288e4a249a6889

Download Submit
memory/2156-0-0x00007FFB52CA3000-0x00007FFB52CA5000-memory.dmp

Filesize
8KB

Download
memory/2156-1-0x00000000007C0000-0x0000000000AE4000-memory.dmp

Filesize
3.1MB

Download
memory/2156-2-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/2156-5-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/2260-6-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/2260-7-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/2260-8-0x000000001D0C0000-0x000000001D110000-memory.dmp

Filesize
320KB

Download
memory/2260-9-0x000000001D1D0000-0x000000001D282000-memory.dmp

Filesize
712KB

Download
memory/2260-10-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download