quasar | af454978c652f9acb95b7c2f45d41ee0ba7923d6e3b3f554af853ef9efff9440

General

Target

Celestial.exe
Size

3.1MB
MD5

12bdd4b4c107fc3ffec7f9b29d7d6a93
SHA1

04bb395848578e22cef0c90215463e4efe4965c3
SHA256

af454978c652f9acb95b7c2f45d41ee0ba7923d6e3b3f554af853ef9efff9440
SHA512

ff4a2c42ac1fed5421955a949cf28c9abb714484bb68259f160516d10a7a179cc6e6327ab2fc2f099ba51a98b25fa5f41ea2af4f3815159e1ce7f75a698b8251
SSDEEP

49152:nv6lL26AaNeWgPhlmVqvMQ7XSKZkxNESElk/iULoGdldTHHB72eh2NT:nviL26AaNeWgPhlmVqkQ7XSKGxsa

Score

10^/10

quasar office04 spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

147.185.221.19:33365

Mutex

ba5220e2-c4e8-4381-aad8-a85115ef955e

Attributes

encryption_key
67C139F3E9A16FF8132A3DCF42197B8BA3C38609
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Miicrosoft Securiity
subdirectory
Miicrosoft Securiity

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/3344-1-0x0000000000AC0000-0x0000000000DE4000-memory.dmp	family_quasar
behavioral1/files/0x0007000000023548-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4764	Client.exe

Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files\Miicrosoft Securiity\Client.exe	Celestial.exe
File opened for modification	C:\Program Files\Miicrosoft Securiity\Client.exe	Celestial.exe
File opened for modification	C:\Program Files\Miicrosoft Securiity	Celestial.exe
File opened for modification	C:\Program Files\Miicrosoft Securiity	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
3428	schtasks.exe
2804	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3344	Celestial.exe
Token: SeDebugPrivilege	4764	Client.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
4764	Client.exe
4764	Client.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
4764	Client.exe
4764	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4764	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3344 wrote to memory of 3428	3344	Celestial.exe	84
PID 3344 wrote to memory of 3428	3344	Celestial.exe	84
PID 3344 wrote to memory of 4764	3344	Celestial.exe	86
PID 3344 wrote to memory of 4764	3344	Celestial.exe	86
PID 4764 wrote to memory of 2804	4764	Client.exe	89
PID 4764 wrote to memory of 2804	4764	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\Celestial.exe
"C:\Users\Admin\AppData\Local\Temp\Celestial.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3344
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Miicrosoft Securiity" /sc ONLOGON /tr "C:\Program Files\Miicrosoft Securiity\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3428
- C:\Program Files\Miicrosoft Securiity\Client.exe
  "C:\Program Files\Miicrosoft Securiity\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4764
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Miicrosoft Securiity" /sc ONLOGON /tr "C:\Program Files\Miicrosoft Securiity\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2804

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Unsecured Credentials

2

T1552

Credentials In Files

1

T1552.001

Credentials in Registry

1

T1552.002

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\Miicrosoft Securiity\Client.exe

Filesize
3.1MB

MD5
12bdd4b4c107fc3ffec7f9b29d7d6a93

SHA1
04bb395848578e22cef0c90215463e4efe4965c3

SHA256
af454978c652f9acb95b7c2f45d41ee0ba7923d6e3b3f554af853ef9efff9440

SHA512
ff4a2c42ac1fed5421955a949cf28c9abb714484bb68259f160516d10a7a179cc6e6327ab2fc2f099ba51a98b25fa5f41ea2af4f3815159e1ce7f75a698b8251

Download Submit
memory/3344-0-0x00007FFB832B3000-0x00007FFB832B5000-memory.dmp

Filesize
8KB

Download
memory/3344-1-0x0000000000AC0000-0x0000000000DE4000-memory.dmp

Filesize
3.1MB

Download
memory/3344-2-0x00007FFB832B0000-0x00007FFB83D71000-memory.dmp

Filesize
10.8MB

Download
memory/3344-8-0x00007FFB832B0000-0x00007FFB83D71000-memory.dmp

Filesize
10.8MB

Download
memory/4764-10-0x00007FFB832B0000-0x00007FFB83D71000-memory.dmp

Filesize
10.8MB

Download
memory/4764-9-0x00007FFB832B0000-0x00007FFB83D71000-memory.dmp

Filesize
10.8MB

Download
memory/4764-11-0x000000001CCF0000-0x000000001CD40000-memory.dmp

Filesize
320KB

Download
memory/4764-12-0x000000001CE00000-0x000000001CEB2000-memory.dmp

Filesize
712KB

Download
memory/4764-15-0x000000001CD80000-0x000000001CD92000-memory.dmp

Filesize
72KB

Download
memory/4764-16-0x000000001D500000-0x000000001D53C000-memory.dmp

Filesize
240KB

Download
memory/4764-17-0x000000001DF70000-0x000000001E498000-memory.dmp

Filesize
5.2MB

Download
memory/4764-18-0x00007FFB832B0000-0x00007FFB83D71000-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