quasar | 4d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205

Resubmissions

07/08/2024, 00:14

240807-ajameavelq 10

07/08/2024, 00:10

240807-agetcaycqd 10

Analysis

max time kernel
125s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
07/08/2024, 00:14

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General

Target

Client-built.exe
Size

3.1MB
MD5

6f2f7543e46ca0cd1eecf947d68b0ec8
SHA1

7cf099fee562af351bebcea654e660fb05a5e736
SHA256

4d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205
SHA512

5851ea5dc7f9160256fb28fb89784fbbe40e244b55f083175382464eafa6c39d8b0c88aead34812c7c9f1abb6ccc1db84f65d379b4e1e6b65f65dc1a1902117c
SSDEEP

49152:ivyI22SsaNYfdPBldt698dBcjHh/RJ6EbR3LoGdf41THHB72eh2NT:ivf22SsaNYfdPBldt6+dBcjHh/RJ6O

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.85:4782

Mutex

d31c90bf-6e6a-483d-9f59-e618a1e6c7c9

Attributes

encryption_key
705FA42F7E103298DD84CEB0EA11F1B6B9143152
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 payload 2 IoCs

resource	yara_rule
behavioral2/memory/3996-1-0x00000000007C0000-0x0000000000AE4000-memory.dmp	family_quasar
behavioral2/files/0x00080000000234d3-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1240	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
2652	schtasks.exe
4048	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3996	Client-built.exe
Token: SeDebugPrivilege	1240	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1240	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3996 wrote to memory of 2652	3996	Client-built.exe	88
PID 3996 wrote to memory of 2652	3996	Client-built.exe	88
PID 3996 wrote to memory of 1240	3996	Client-built.exe	90
PID 3996 wrote to memory of 1240	3996	Client-built.exe	90
PID 1240 wrote to memory of 4048	1240	Client.exe	91
PID 1240 wrote to memory of 4048	1240	Client.exe	91

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-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3996
- 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:2652
- 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:1240
- - 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:4048

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

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
6f2f7543e46ca0cd1eecf947d68b0ec8

SHA1
7cf099fee562af351bebcea654e660fb05a5e736

SHA256
4d9417d9d1f8779020682a3882dc72979a504ea9b71ef51b37084556aa0d7205

SHA512
5851ea5dc7f9160256fb28fb89784fbbe40e244b55f083175382464eafa6c39d8b0c88aead34812c7c9f1abb6ccc1db84f65d379b4e1e6b65f65dc1a1902117c

Download Submit
memory/1240-10-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

Filesize
10.8MB

Download
memory/1240-11-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

Filesize
10.8MB

Download
memory/1240-12-0x000000001B210000-0x000000001B260000-memory.dmp

Filesize
320KB

Download
memory/1240-13-0x000000001BA50000-0x000000001BB02000-memory.dmp

Filesize
712KB

Download
memory/1240-14-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

Filesize
10.8MB

Download
memory/3996-0-0x00007FF8FF573000-0x00007FF8FF575000-memory.dmp

Filesize
8KB

Download
memory/3996-1-0x00000000007C0000-0x0000000000AE4000-memory.dmp

Filesize
3.1MB

Download
memory/3996-2-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

Filesize
10.8MB

Download
memory/3996-9-0x00007FF8FF570000-0x00007FF900031000-memory.dmp

Filesize
10.8MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads