quasar | 5c2a95b717e2cd4da5422896a80f33bd27521083fbbdea08e6d6b6d4c6f81abd

Analysis

max time kernel
154s
max time network
160s
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 02:39

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General

Target

AFAYHFuwgf}.exe
Size

3.1MB
MD5

f7ee5f7fcc03f3f38f0a544cdcabd2ac
SHA1

dceada30e23a8b964b73076c39576fc79b661c40
SHA256

5c2a95b717e2cd4da5422896a80f33bd27521083fbbdea08e6d6b6d4c6f81abd
SHA512

fe0b66fe73aef87b7110d82b75e19f4dcbd83dc8847530a7ad9ea791a396cdd58ebdc4f5e15142c1783f5ba7c8744d6ff1b540ad0c873f73d8b95d30c1a3ff91
SSDEEP

49152:bvyI22SsaNYfdPBldt698dBcjHYU/89mzlDoGdOATHHB72eh2NT:bvf22SsaNYfdPBldt6+dBcjHZ/8M

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.9:4782

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/4720-1-0x0000000000E40000-0x0000000001164000-memory.dmp	family_quasar
behavioral1/files/0x00280000000450a6-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3920	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
4800	schtasks.exe
1660	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4720	AFAYHFuwgf}.exe
Token: SeDebugPrivilege	3920	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3920	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4720 wrote to memory of 4800	4720	AFAYHFuwgf}.exe	84
PID 4720 wrote to memory of 4800	4720	AFAYHFuwgf}.exe	84
PID 4720 wrote to memory of 3920	4720	AFAYHFuwgf}.exe	86
PID 4720 wrote to memory of 3920	4720	AFAYHFuwgf}.exe	86
PID 3920 wrote to memory of 1660	3920	Client.exe	87
PID 3920 wrote to memory of 1660	3920	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\AFAYHFuwgf}.exe
"C:\Users\Admin\AppData\Local\Temp\AFAYHFuwgf}.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4720
- 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:4800
- 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:3920
- - 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:1660

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
f7ee5f7fcc03f3f38f0a544cdcabd2ac

SHA1
dceada30e23a8b964b73076c39576fc79b661c40

SHA256
5c2a95b717e2cd4da5422896a80f33bd27521083fbbdea08e6d6b6d4c6f81abd

SHA512
fe0b66fe73aef87b7110d82b75e19f4dcbd83dc8847530a7ad9ea791a396cdd58ebdc4f5e15142c1783f5ba7c8744d6ff1b540ad0c873f73d8b95d30c1a3ff91

Download Submit
memory/3920-6-0x00007FFC69E50000-0x00007FFC6A912000-memory.dmp

Filesize
10.8MB

Download
memory/3920-7-0x00007FFC69E50000-0x00007FFC6A912000-memory.dmp

Filesize
10.8MB

Download
memory/3920-8-0x000000001C880000-0x000000001C8D0000-memory.dmp

Filesize
320KB

Download
memory/3920-9-0x000000001C990000-0x000000001CA42000-memory.dmp

Filesize
712KB

Download
memory/3920-10-0x00007FFC69E50000-0x00007FFC6A912000-memory.dmp

Filesize
10.8MB

Download
memory/4720-0-0x00007FFC69E53000-0x00007FFC69E55000-memory.dmp

Filesize
8KB

Download
memory/4720-1-0x0000000000E40000-0x0000000001164000-memory.dmp

Filesize
3.1MB

Download
memory/4720-2-0x00007FFC69E50000-0x00007FFC6A912000-memory.dmp

Filesize
10.8MB

Download
memory/4720-5-0x00007FFC69E50000-0x00007FFC6A912000-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