quasar | f41729681dcb0b5aa76c5d0d339c47df4fd7bdf120c64616c0851dd16d68ab9f

Analysis

max time kernel
149s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
04-02-2025 04:09

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General

Target

Client-built.exe
Size

3.1MB
MD5

68a376fc7e9f5b9e51f152e9782f4431
SHA1

876a1e862414cf310f9fda1c8728ce4c68c0b616
SHA256

f41729681dcb0b5aa76c5d0d339c47df4fd7bdf120c64616c0851dd16d68ab9f
SHA512

46a74afc0c8350690d0e8ef460b183848fe62ba389162476c6632afe1e93bc1b674dd00efab0fb2811acaf9b3cec18895fc498f063463b1f5a500911e6858ed1
SSDEEP

49152:evaY52fyaSZOrPWluWBuGG5g5hHMkaC4npoGda0BTHHB72eh2NT:evv52fyaSZOrPWluWBDG5g5hHMk2

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.0.34:4800

Mutex

366cc5a6-9875-43f5-b406-b422373aa69b

Attributes

encryption_key
13765B0E8E4F6CB0053DA8B5123C9FA10F47987B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
bob
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/1388-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar
behavioral1/files/0x001c00000002aaf5-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
640	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
2812	schtasks.exe
1208	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1388	Client-built.exe
Token: SeDebugPrivilege	640	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
640	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1388 wrote to memory of 2812	1388	Client-built.exe	77
PID 1388 wrote to memory of 2812	1388	Client-built.exe	77
PID 1388 wrote to memory of 640	1388	Client-built.exe	79
PID 1388 wrote to memory of 640	1388	Client-built.exe	79
PID 640 wrote to memory of 1208	640	Client.exe	80
PID 640 wrote to memory of 1208	640	Client.exe	80

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:1388
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2812
- 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:640
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1208

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
68a376fc7e9f5b9e51f152e9782f4431

SHA1
876a1e862414cf310f9fda1c8728ce4c68c0b616

SHA256
f41729681dcb0b5aa76c5d0d339c47df4fd7bdf120c64616c0851dd16d68ab9f

SHA512
46a74afc0c8350690d0e8ef460b183848fe62ba389162476c6632afe1e93bc1b674dd00efab0fb2811acaf9b3cec18895fc498f063463b1f5a500911e6858ed1

Download Submit
memory/640-10-0x00007FF8289D0000-0x00007FF829492000-memory.dmp

Filesize
10.8MB

Download
memory/640-11-0x00007FF8289D0000-0x00007FF829492000-memory.dmp

Filesize
10.8MB

Download
memory/640-12-0x0000000002C60000-0x0000000002CB0000-memory.dmp

Filesize
320KB

Download
memory/640-13-0x000000001BF50000-0x000000001C002000-memory.dmp

Filesize
712KB

Download
memory/640-14-0x00007FF8289D0000-0x00007FF829492000-memory.dmp

Filesize
10.8MB

Download
memory/1388-0-0x00007FF8289D3000-0x00007FF8289D5000-memory.dmp

Filesize
8KB

Download
memory/1388-1-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/1388-2-0x00007FF8289D0000-0x00007FF829492000-memory.dmp

Filesize
10.8MB

Download
memory/1388-9-0x00007FF8289D0000-0x00007FF829492000-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