quasar | b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62

Analysis

max time kernel
150s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20240730-en
resource tags

arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
submitted
31/07/2024, 23:29

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General

Target
b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe
Size 3.1MB
Sample240731-3gh5zstfnc
SHA256 b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62
MD5 7c57eda4bef5b6a6f5ca084dde31deb7
SHA1 8ed5f1f48691e8d3d5e910b1fd46d0ce0d30eb1e
SHA512 22d5be1c470f673b7a89ccb972c9b907eb76a070246d071550d891d52d2e4eba2a14df6924b98e1d866ad216e02e3a7cc368f545a578dfe6eaffec461abefe5d
SSDEEP 49152:ivjI22SsaNYfdPBldt698dBcjHHAek9hBvJGLoGdkTHHB72eh2NT:ivc22SsaNYfdPBldt6+dBcjH2h8
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.28:4782

Mutex

180b92ba-98f1-484b-b54f-264758c8d7f4

Attributes

encryption_key
E2AD968D101B25448614267CCA174D53CE1050BA
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
BootstrapperV1.11
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1212-1-0x0000000000C30000-0x0000000000F54000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023452-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4224	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
2308	schtasks.exe
2372	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1212	b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe
Token: SeDebugPrivilege	4224	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4224	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1212 wrote to memory of 2308	1212	b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe	86
PID 1212 wrote to memory of 2308	1212	b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe	86
PID 1212 wrote to memory of 4224	1212	b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe	88
PID 1212 wrote to memory of 4224	1212	b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe	88
PID 4224 wrote to memory of 2372	4224	Client.exe	89
PID 4224 wrote to memory of 2372	4224	Client.exe	89

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\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe
"C:\Users\Admin\AppData\Local\Temp\b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1212
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2308
- 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:4224
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "BootstrapperV1.11" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2372

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

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 b8d24236cb542dd0358707623e485d1f8f5b917103f88e7de9d81356a8bd0a62
MD5 7c57eda4bef5b6a6f5ca084dde31deb7
SHA1 8ed5f1f48691e8d3d5e910b1fd46d0ce0d30eb1e
SHA512 22d5be1c470f673b7a89ccb972c9b907eb76a070246d071550d891d52d2e4eba2a14df6924b98e1d866ad216e02e3a7cc368f545a578dfe6eaffec461abefe5d
SSDEEP 49152:ivjI22SsaNYfdPBldt698dBcjHHAek9hBvJGLoGdkTHHB72eh2NT:ivc22SsaNYfdPBldt6+dBcjH2h8
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1212-1-0x0000000000C30000-0x0000000000F54000-memory.dmp

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memory/1212-0-0x00007FFCE9D83000-0x00007FFCE9D85000-memory.dmp

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memory/1212-2-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

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memory/1212-9-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

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memory/4224-8-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

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memory/4224-10-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

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memory/4224-11-0x000000001C630000-0x000000001C680000-memory.dmp

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memory/4224-12-0x000000001C740000-0x000000001C7F2000-memory.dmp

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memory/4224-13-0x00007FFCE9D80000-0x00007FFCEA841000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads