quasar | fd5b712e067c1089aed9df7588844adef501a2c9742107a564a408965fb87c12

Analysis

max time kernel
3s
max time network
8s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
20-11-2024 15:17

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General

Target

Client.exe
Size

3.1MB
MD5

d1675434eee067b0a023a3c31cf7ba75
SHA1

baf38fe44bfea1a3f4ef5c387b71d2e08e7edc29
SHA256

fd5b712e067c1089aed9df7588844adef501a2c9742107a564a408965fb87c12
SHA512

2316bc1b93a8b816963c5199f2fecaabaaef355bd8047af3c3b432250ae92e3010db45887a57176d1a639849f70c9c16fdec5b28c3f9ab9a166456fb003657ec
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjH7CD2a95fQ7k/PLoGdNTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjHe6aD

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.83:4782

Mutex

20eb3b08-32c9-45df-9d5a-fb58af454c08

Attributes

encryption_key
22C1A62E3E9EE906C0C8F9D30DA34D63B8A197BA
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 3 IoCs

resource	yara_rule
behavioral1/memory/1920-1-0x0000000000D20000-0x0000000001044000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016d3f-6.dat	family_quasar
behavioral1/memory/768-9-0x0000000000D50000-0x0000000001074000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
768	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
2332	schtasks.exe
1784	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1920	Client.exe
Token: SeDebugPrivilege	768	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
768	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1920 wrote to memory of 2332	1920	Client.exe	31
PID 1920 wrote to memory of 2332	1920	Client.exe	31
PID 1920 wrote to memory of 2332	1920	Client.exe	31
PID 1920 wrote to memory of 768	1920	Client.exe	33
PID 1920 wrote to memory of 768	1920	Client.exe	33
PID 1920 wrote to memory of 768	1920	Client.exe	33
PID 768 wrote to memory of 1784	768	Client.exe	34
PID 768 wrote to memory of 1784	768	Client.exe	34
PID 768 wrote to memory of 1784	768	Client.exe	34

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.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1920
- 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:2332
- 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:768
- - 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:1784

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
d1675434eee067b0a023a3c31cf7ba75

SHA1
baf38fe44bfea1a3f4ef5c387b71d2e08e7edc29

SHA256
fd5b712e067c1089aed9df7588844adef501a2c9742107a564a408965fb87c12

SHA512
2316bc1b93a8b816963c5199f2fecaabaaef355bd8047af3c3b432250ae92e3010db45887a57176d1a639849f70c9c16fdec5b28c3f9ab9a166456fb003657ec

Download Submit
memory/768-10-0x000007FEF5EE0000-0x000007FEF68CC000-memory.dmp

Filesize
9.9MB

Download
memory/768-11-0x000007FEF5EE0000-0x000007FEF68CC000-memory.dmp

Filesize
9.9MB

Download
memory/768-9-0x0000000000D50000-0x0000000001074000-memory.dmp

Filesize
3.1MB

Download
memory/1920-0-0x000007FEF5EE3000-0x000007FEF5EE4000-memory.dmp

Filesize
4KB

Download
memory/1920-1-0x0000000000D20000-0x0000000001044000-memory.dmp

Filesize
3.1MB

Download
memory/1920-2-0x000007FEF5EE0000-0x000007FEF68CC000-memory.dmp

Filesize
9.9MB

Download
memory/1920-8-0x000007FEF5EE0000-0x000007FEF68CC000-memory.dmp

Filesize
9.9MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads