quasar | 4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521

Analysis

max time kernel
146s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
18-12-2024 02:28

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General

Target

4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe
Size

3.1MB
MD5

5c585cd5a2d292a0cb0be6b10cace921
SHA1

84b90137c36d741a4291aa22f4450c470ed9bd89
SHA256

4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521
SHA512

958c91d84c7e163fd473caf91363680347aa452aebdae76a4c01b39da790d003c20af6462bec3663c0208e8680ae2a9042fbc2c8ed8960e062dd51070fa39b27
SSDEEP

49152:avCI22SsaNYfdPBldt698dBcjHQCv1JSpoGdTvTHHB72eh2NT:avP22SsaNYfdPBldt6+dBcjHQCa

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

tieumao1995-51127.portmap.io:51127

Mutex

4119a2e0-4ae4-4843-8534-99af91a2475d

Attributes

encryption_key
DF6316067206E09C1F85138FCEBD56F5D94BF6AE
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/3152-1-0x00000000003D0000-0x00000000006F6000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c92-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3340	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
4004	schtasks.exe
4592	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3152	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe
Token: SeDebugPrivilege	3340	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3340	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3340	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3340	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3152 wrote to memory of 4004	3152	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	82
PID 3152 wrote to memory of 4004	3152	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	82
PID 3152 wrote to memory of 3340	3152	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	84
PID 3152 wrote to memory of 3340	3152	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	84
PID 3340 wrote to memory of 4592	3340	Client.exe	86
PID 3340 wrote to memory of 4592	3340	Client.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\4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe
"C:\Users\Admin\AppData\Local\Temp\4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3152
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4004
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3340
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4592

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
5c585cd5a2d292a0cb0be6b10cace921

SHA1
84b90137c36d741a4291aa22f4450c470ed9bd89

SHA256
4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521

SHA512
958c91d84c7e163fd473caf91363680347aa452aebdae76a4c01b39da790d003c20af6462bec3663c0208e8680ae2a9042fbc2c8ed8960e062dd51070fa39b27

Download Submit
memory/3152-0-0x00007FF8563B3000-0x00007FF8563B5000-memory.dmp

Filesize
8KB

Download
memory/3152-1-0x00000000003D0000-0x00000000006F6000-memory.dmp

Filesize
3.1MB

Download
memory/3152-2-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3152-9-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3340-8-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3340-10-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3340-11-0x000000001B930000-0x000000001B980000-memory.dmp

Filesize
320KB

Download
memory/3340-12-0x000000001C290000-0x000000001C342000-memory.dmp

Filesize
712KB

Download
memory/3340-13-0x00007FF8563B0000-0x00007FF856E71000-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