quasar | 6681cb73deb0effc4f44f704c6bddb07e98c1f8da4c8478cca7ddd49abdb0c3f

Analysis

max time kernel
149s
max time network
168s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:08

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General

Target

1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe
Size

3.1MB
MD5

35110eedb3518d1905b88025bf11b77d
SHA1

c39e96cc0dcb14065984c3d3fbff331070e37feb
SHA256

1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd
SHA512

08a3db05d373eb18f9b86fcea5b4338bd4cf3ca60df9906873bc0eb4d2dd6bc544890d23543df9be0848647d89a14d51010a7498bf8041c6872d8af768e035d2
SSDEEP

49152:DvDI22SsaNYfdPBldt698dBcjHEhE3uarOLoGdtTHHB72eh2NT:Dv822SsaNYfdPBldt6+dBcjHZ3I

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.55:4782

Mutex

87124d35-b950-4c06-bdf9-de6bd7aaa9ef

Attributes

encryption_key
CF3A949D653E8E253D64DB361EE16669CD9DE402
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
behavioral28/memory/2512-1-0x00000000003B0000-0x00000000006D4000-memory.dmp	family_quasar
behavioral28/files/0x000b00000002414b-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3364	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
4776	schtasks.exe
5852	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2512	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe
Token: SeDebugPrivilege	3364	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3364	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2512 wrote to memory of 4776	2512	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	88
PID 2512 wrote to memory of 4776	2512	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	88
PID 2512 wrote to memory of 3364	2512	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	90
PID 2512 wrote to memory of 3364	2512	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	90
PID 3364 wrote to memory of 5852	3364	Client.exe	91
PID 3364 wrote to memory of 5852	3364	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\1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe
"C:\Users\Admin\AppData\Local\Temp\1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2512
- 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:4776
- 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:3364
- - 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:5852

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
35110eedb3518d1905b88025bf11b77d

SHA1
c39e96cc0dcb14065984c3d3fbff331070e37feb

SHA256
1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd

SHA512
08a3db05d373eb18f9b86fcea5b4338bd4cf3ca60df9906873bc0eb4d2dd6bc544890d23543df9be0848647d89a14d51010a7498bf8041c6872d8af768e035d2

Download Submit
memory/2512-1-0x00000000003B0000-0x00000000006D4000-memory.dmp

Filesize
3.1MB

Download
memory/2512-0-0x00007FFDD8543000-0x00007FFDD8545000-memory.dmp

Filesize
8KB

Download
memory/2512-2-0x00007FFDD8540000-0x00007FFDD9001000-memory.dmp

Filesize
10.8MB

Download
memory/2512-13-0x00007FFDD8540000-0x00007FFDD9001000-memory.dmp

Filesize
10.8MB

Download
memory/3364-9-0x00007FFDD8540000-0x00007FFDD9001000-memory.dmp

Filesize
10.8MB

Download
memory/3364-10-0x00007FFDD8540000-0x00007FFDD9001000-memory.dmp

Filesize
10.8MB

Download
memory/3364-11-0x000000001B040000-0x000000001B090000-memory.dmp

Filesize
320KB

Download
memory/3364-12-0x000000001D140000-0x000000001D1F2000-memory.dmp

Filesize
712KB

Download
memory/3364-14-0x00007FFDD8540000-0x00007FFDD9001000-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