quasar | 2848ac271c559c6fae6e1ed2ab87b6c78b1eea35945c6f0457872804077ce3a4

Analysis

max time kernel
127s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-11-2024 23:01

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General

Target

antivairus.exe
Size

3.1MB
MD5

2477f49a356c0698fc601aef9ed64d08
SHA1

56eb441feffcac5f7a8889f16c8cbc9255d25979
SHA256

2848ac271c559c6fae6e1ed2ab87b6c78b1eea35945c6f0457872804077ce3a4
SHA512

6f091994efffb7a0b2ac90ce61c5050da2be48abd33060b3461539ecfedee72a691142899c3f2b9fe4678f0ae2c7b1b16aeb1b91932b3c0a785b0625105659a8
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjH7sRJ6BbR3LoGdXTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjH7sRJ6j

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

190.104.116.8:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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

Processes:

resource	yara_rule
behavioral2/memory/4140-1-0x0000000000420000-0x0000000000744000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1556 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

Processes:

schtasks.exeschtasks.exe

pid process

3100 schtasks.exe
2476 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

antivairus.exeClient.exe

description pid process

Token: SeDebugPrivilege 4140 antivairus.exe
Token: SeDebugPrivilege 1556 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1556 Client.exe

pid	process
1556	Client.exe

pid	process
3100	schtasks.exe
2476	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4140	antivairus.exe
Token: SeDebugPrivilege	1556	Client.exe

pid	process
1556	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

antivairus.exeClient.exe

description	pid	process	target process
PID 4140 wrote to memory of 3100	4140	antivairus.exe	schtasks.exe
PID 4140 wrote to memory of 3100	4140	antivairus.exe	schtasks.exe
PID 4140 wrote to memory of 1556	4140	antivairus.exe	Client.exe
PID 4140 wrote to memory of 1556	4140	antivairus.exe	Client.exe
PID 1556 wrote to memory of 2476	1556	Client.exe	schtasks.exe
PID 1556 wrote to memory of 2476	1556	Client.exe	schtasks.exe

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\antivairus.exe
"C:\Users\Admin\AppData\Local\Temp\antivairus.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4140
- 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:3100
- 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:1556
- - 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:2476

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
2477f49a356c0698fc601aef9ed64d08

SHA1
56eb441feffcac5f7a8889f16c8cbc9255d25979

SHA256
2848ac271c559c6fae6e1ed2ab87b6c78b1eea35945c6f0457872804077ce3a4

SHA512
6f091994efffb7a0b2ac90ce61c5050da2be48abd33060b3461539ecfedee72a691142899c3f2b9fe4678f0ae2c7b1b16aeb1b91932b3c0a785b0625105659a8

Download Submit
memory/1556-9-0x00007FFEB07D0000-0x00007FFEB1291000-memory.dmp

Filesize
10.8MB

Download
memory/1556-11-0x00007FFEB07D0000-0x00007FFEB1291000-memory.dmp

Filesize
10.8MB

Download
memory/1556-12-0x0000000003110000-0x0000000003160000-memory.dmp

Filesize
320KB

Download
memory/1556-13-0x000000001C410000-0x000000001C4C2000-memory.dmp

Filesize
712KB

Download
memory/1556-14-0x00007FFEB07D0000-0x00007FFEB1291000-memory.dmp

Filesize
10.8MB

Download
memory/4140-0-0x00007FFEB07D3000-0x00007FFEB07D5000-memory.dmp

Filesize
8KB

Download
memory/4140-1-0x0000000000420000-0x0000000000744000-memory.dmp

Filesize
3.1MB

Download
memory/4140-2-0x00007FFEB07D0000-0x00007FFEB1291000-memory.dmp

Filesize
10.8MB

Download
memory/4140-10-0x00007FFEB07D0000-0x00007FFEB1291000-memory.dmp

Filesize
10.8MB

Download