quasar | 56a35f9bcb582449d44a4bed4fa36dcb140f04961f0f1fec1d96385569f72cac

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-12-2024 06:44

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General

Target

client.exe
Size

3.1MB
MD5

29de30606fa3cd9024d87066016d0351
SHA1

32af15b435a5f26655947612fe30da89b5a29370
SHA256

56a35f9bcb582449d44a4bed4fa36dcb140f04961f0f1fec1d96385569f72cac
SHA512

6fbe73cddab8a943d1ce060da1a3d26832616aefad76fe3b1dbd71991e4412a591133aee34df6a467a15acce8c587ea1420ca2f0dc4c8c77d54b8712a00a9355
SSDEEP

49152:KvyI22SsaNYfdPBldt698dBcjHwCV1JupoGdaELTHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHwC8

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.100.18:4782

Mutex

2cbe985c-9a4f-4f1f-a761-cd05d5feff4b

Attributes

encryption_key
9493303F9F1D303190787B3D987F2DCB2BAF3CFD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client 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/2148-1-0x0000000000780000-0x0000000000AA4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c98-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3884	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
4640	schtasks.exe
4496	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2148	client.exe
Token: SeDebugPrivilege	3884	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3884	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2148 wrote to memory of 4640	2148	client.exe	83
PID 2148 wrote to memory of 4640	2148	client.exe	83
PID 2148 wrote to memory of 3884	2148	client.exe	85
PID 2148 wrote to memory of 3884	2148	client.exe	85
PID 3884 wrote to memory of 4496	3884	Client.exe	86
PID 3884 wrote to memory of 4496	3884	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\client.exe
"C:\Users\Admin\AppData\Local\Temp\client.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2148
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4640
- 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:3884
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4496

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\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
29de30606fa3cd9024d87066016d0351

SHA1
32af15b435a5f26655947612fe30da89b5a29370

SHA256
56a35f9bcb582449d44a4bed4fa36dcb140f04961f0f1fec1d96385569f72cac

SHA512
6fbe73cddab8a943d1ce060da1a3d26832616aefad76fe3b1dbd71991e4412a591133aee34df6a467a15acce8c587ea1420ca2f0dc4c8c77d54b8712a00a9355

Download Submit
memory/2148-0-0x00007FFAD9D83000-0x00007FFAD9D85000-memory.dmp

Filesize
8KB

Download
memory/2148-1-0x0000000000780000-0x0000000000AA4000-memory.dmp

Filesize
3.1MB

Download
memory/2148-2-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/2148-10-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/3884-11-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/3884-12-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/3884-13-0x000000001B1A0000-0x000000001B1F0000-memory.dmp

Filesize
320KB

Download
memory/3884-14-0x000000001B7F0000-0x000000001B8A2000-memory.dmp

Filesize
712KB

Download
memory/3884-15-0x00007FFAD9D80000-0x00007FFADA841000-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