quasar | e352a653ea9ba91b1d3d6c3c71695c27b4c0fa0ab90ed1c23cbbd2a22b9efece

Analysis

max time kernel
126s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
14/11/2024, 23:55

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General

Target

Client-built.exe
Size

502KB
MD5

9df20812514dfcb87a556a5ef71d72bc
SHA1

798340d0ab815844690c29db3e791537690b752a
SHA256

e352a653ea9ba91b1d3d6c3c71695c27b4c0fa0ab90ed1c23cbbd2a22b9efece
SHA512

784f850c7abfb9d8d128cfdd906f7d1856898b6ffb58d9a6e86bd1ea629f2574f683f3cd60d0defdd8eea244705f81248f55d27827271f34a26e77250be64398
SSDEEP

12288:RTEgdfYnxUjmOad344ywgmpaO+gQvcdS:SUwMAd/ywgmpaO+gQvcdS

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

192.168.56.1:4782

Mutex

0623266f-d360-4056-9f63-ed81b7a11fdf

Attributes

encryption_key
CAC47E124130EBD3A11EBA5B8DAA79439482A0B5
install_name
Broker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Broker
subdirectory
Broker

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/3388-1-0x0000000000B50000-0x0000000000BD4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c9e-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1604	Broker.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
3800	schtasks.exe
928	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3388	Client-built.exe
Token: SeDebugPrivilege	1604	Broker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1604	Broker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3388 wrote to memory of 3800	3388	Client-built.exe	86
PID 3388 wrote to memory of 3800	3388	Client-built.exe	86
PID 3388 wrote to memory of 1604	3388	Client-built.exe	88
PID 3388 wrote to memory of 1604	3388	Client-built.exe	88
PID 1604 wrote to memory of 928	1604	Broker.exe	89
PID 1604 wrote to memory of 928	1604	Broker.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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3388
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Broker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3800
- C:\Users\Admin\AppData\Roaming\Broker\Broker.exe
  "C:\Users\Admin\AppData\Roaming\Broker\Broker.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1604
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Broker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Broker\Broker.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:928

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\Broker\Broker.exe

Filesize
502KB

MD5
9df20812514dfcb87a556a5ef71d72bc

SHA1
798340d0ab815844690c29db3e791537690b752a

SHA256
e352a653ea9ba91b1d3d6c3c71695c27b4c0fa0ab90ed1c23cbbd2a22b9efece

SHA512
784f850c7abfb9d8d128cfdd906f7d1856898b6ffb58d9a6e86bd1ea629f2574f683f3cd60d0defdd8eea244705f81248f55d27827271f34a26e77250be64398

Download Submit
memory/1604-8-0x00007FFEAEFA0000-0x00007FFEAFA61000-memory.dmp

Filesize
10.8MB

Download
memory/1604-10-0x00007FFEAEFA0000-0x00007FFEAFA61000-memory.dmp

Filesize
10.8MB

Download
memory/1604-11-0x00000000016E0000-0x0000000001730000-memory.dmp

Filesize
320KB

Download
memory/1604-12-0x000000001C300000-0x000000001C3B2000-memory.dmp

Filesize
712KB

Download
memory/1604-13-0x00007FFEAEFA0000-0x00007FFEAFA61000-memory.dmp

Filesize
10.8MB

Download
memory/3388-0-0x00007FFEAEFA3000-0x00007FFEAEFA5000-memory.dmp

Filesize
8KB

Download
memory/3388-1-0x0000000000B50000-0x0000000000BD4000-memory.dmp

Filesize
528KB

Download
memory/3388-2-0x00007FFEAEFA0000-0x00007FFEAFA61000-memory.dmp

Filesize
10.8MB

Download
memory/3388-9-0x00007FFEAEFA0000-0x00007FFEAFA61000-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