quasar | 77c7a5365e87eb2bb21ab93df1c0c126c5eeac7d252b7a82ea3a0c3c72696d28

Analysis

max time kernel
101s
max time network
101s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250128-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250128-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
31/01/2025, 19:31

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General

Target

Client-built.exe
Size

3.1MB
MD5

8e3d793135c7bbcd500a9898f9bf87f9
SHA1

c49bd760c70c65ae8c6988eb6e07e4d1e034b0d4
SHA256

77c7a5365e87eb2bb21ab93df1c0c126c5eeac7d252b7a82ea3a0c3c72696d28
SHA512

a64b7d682d78e1a268d8c0e6b0e323919687ca604ff6905aaac7af6184825c8389c57acdae653a8f3f09f71c672768ce2b0538eba5dc71eca42411cbfe9be7c1
SSDEEP

49152:LvzlL26AaNeWgPhlmVqvMQ7XSKtsRJ6vbR3LoGdXTHHB72eh2NT:LvpL26AaNeWgPhlmVqkQ7XSKtsRJ6B

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.31.81:4782

Mutex

eeab585f-b0d1-4116-86bf-2dd9d4212cc5

Attributes

encryption_key
554C6E8AB4C4203FCE94ABDFD5608449D2385C7B
install_name
WindowsSecurity.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Security Notifications
subdirectory
Windows Files

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/3524-1-0x0000000000F20000-0x0000000001244000-memory.dmp	family_quasar
behavioral2/files/0x000b000000027cd1-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3988	WindowsSecurity.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
2984	schtasks.exe
4884	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3524	Client-built.exe
Token: SeDebugPrivilege	3988	WindowsSecurity.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3988	WindowsSecurity.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3524 wrote to memory of 2984	3524	Client-built.exe	83
PID 3524 wrote to memory of 2984	3524	Client-built.exe	83
PID 3524 wrote to memory of 3988	3524	Client-built.exe	85
PID 3524 wrote to memory of 3988	3524	Client-built.exe	85
PID 3988 wrote to memory of 4884	3988	WindowsSecurity.exe	86
PID 3988 wrote to memory of 4884	3988	WindowsSecurity.exe	86

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:3524
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Security Notifications" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2984
- C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe
  "C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3988
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Security Notifications" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Files\WindowsSecurity.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4884

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\Windows Files\WindowsSecurity.exe

Filesize
3.1MB

MD5
8e3d793135c7bbcd500a9898f9bf87f9

SHA1
c49bd760c70c65ae8c6988eb6e07e4d1e034b0d4

SHA256
77c7a5365e87eb2bb21ab93df1c0c126c5eeac7d252b7a82ea3a0c3c72696d28

SHA512
a64b7d682d78e1a268d8c0e6b0e323919687ca604ff6905aaac7af6184825c8389c57acdae653a8f3f09f71c672768ce2b0538eba5dc71eca42411cbfe9be7c1

Download Submit
memory/3524-0-0x00007FF9BCF13000-0x00007FF9BCF15000-memory.dmp

Filesize
8KB

Download
memory/3524-1-0x0000000000F20000-0x0000000001244000-memory.dmp

Filesize
3.1MB

Download
memory/3524-2-0x00007FF9BCF10000-0x00007FF9BD9D2000-memory.dmp

Filesize
10.8MB

Download
memory/3524-5-0x00007FF9BCF10000-0x00007FF9BD9D2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-6-0x00007FF9BCF10000-0x00007FF9BD9D2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-7-0x00007FF9BCF10000-0x00007FF9BD9D2000-memory.dmp

Filesize
10.8MB

Download
memory/3988-8-0x000000001C8D0000-0x000000001C920000-memory.dmp

Filesize
320KB

Download
memory/3988-9-0x000000001C9E0000-0x000000001CA92000-memory.dmp

Filesize
712KB

Download
memory/3988-10-0x00007FF9BCF10000-0x00007FF9BD9D2000-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