quasar | 8f00cd6fa542c1847aa45bc2447421adcbdd0b2d8d5ab6de9b92f20ca14aae37

Analysis

max time kernel
886s
max time network
899s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
17-01-2025 14:05

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General

Target

loader.exe
Size

3.1MB
MD5

f8005ed6248fe1b06c0b17b6e22d25a7
SHA1

905d315d3a227248b89ad1a0389051e8351a6235
SHA256

8f00cd6fa542c1847aa45bc2447421adcbdd0b2d8d5ab6de9b92f20ca14aae37
SHA512

8eb5092b6b28f2651ecf8318535e42606f1fc585b089928ca519a1ce3f7a087755fde07078b0ef9109e8081d78805e339e77bf23e10b79c8ffe040bde6ceaddb
SSDEEP

49152:HvyI22SsaNYfdPBldt698dBcjHb5xNESEJk/ilLoGdzTHHB72eh2NT:Hvf22SsaNYfdPBldt6+dBcjH1xE9

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

26.160.231.118:4782

Mutex

029aecb2-1011-46ca-b46a-5adb92b6bd76

Attributes

encryption_key
446E052D4DC2A4CD1DC163FE5FE65B68BD5EF859
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
behavioral2/memory/5012-1-0x00000000004E0000-0x0000000000804000-memory.dmp	family_quasar
behavioral2/files/0x001b00000002aaee-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2168	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
3520	schtasks.exe
3812	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5012	loader.exe
Token: SeDebugPrivilege	2168	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2168	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5012 wrote to memory of 3520	5012	loader.exe	78
PID 5012 wrote to memory of 3520	5012	loader.exe	78
PID 5012 wrote to memory of 2168	5012	loader.exe	80
PID 5012 wrote to memory of 2168	5012	loader.exe	80
PID 2168 wrote to memory of 3812	2168	Client.exe	81
PID 2168 wrote to memory of 3812	2168	Client.exe	81

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\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5012
- 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:3520
- 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:2168
- - 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:3812

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
f8005ed6248fe1b06c0b17b6e22d25a7

SHA1
905d315d3a227248b89ad1a0389051e8351a6235

SHA256
8f00cd6fa542c1847aa45bc2447421adcbdd0b2d8d5ab6de9b92f20ca14aae37

SHA512
8eb5092b6b28f2651ecf8318535e42606f1fc585b089928ca519a1ce3f7a087755fde07078b0ef9109e8081d78805e339e77bf23e10b79c8ffe040bde6ceaddb

Download Submit
memory/2168-10-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download
memory/2168-11-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download
memory/2168-12-0x000000001C5D0000-0x000000001C620000-memory.dmp

Filesize
320KB

Download
memory/2168-13-0x000000001C6E0000-0x000000001C792000-memory.dmp

Filesize
712KB

Download
memory/2168-14-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download
memory/5012-0-0x00007FFB50323000-0x00007FFB50325000-memory.dmp

Filesize
8KB

Download
memory/5012-1-0x00000000004E0000-0x0000000000804000-memory.dmp

Filesize
3.1MB

Download
memory/5012-2-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download
memory/5012-9-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads