quasar | 31ea3fc3712ff925dc56d07e2cae38724e16acd8c1ac719cb5704b4f40da7e55

General

Target

Client-built(1).exe
Size

3.1MB
MD5

ef3e3811d92c8c39a9dbfa1b3d0dcece
SHA1

8238396252ae7c164c0bca49163040f236fd5148
SHA256

31ea3fc3712ff925dc56d07e2cae38724e16acd8c1ac719cb5704b4f40da7e55
SHA512

f9941d6b7680bac92de5c5af99ccbd4fca77e207330ec918a5a6c4b73a17ae228f4a53a21f33e5491e591ccd970fa0a0a82abacb926c235650c7702555a20a46
SSDEEP

49152:PvjI22SsaNYfdPBldt698dBcjHZGSxNESEjk/iGLoGd6CTHHB72eh2NT:Pvc22SsaNYfdPBldt6+dBcjH9x6I

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

146.0.191.34:4782

Mutex

89ec14d4-c260-40fa-a167-34d2cb269530

Attributes

encryption_key
55CC02601E58E75BE97D8FB498B201E77070B65F
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/3920-1-0x0000000000D70000-0x0000000001094000-memory.dmp	family_quasar
C:\Program Files\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

4360 Client.exe

pid	process
4360	Client.exe

Drops file in Program Files directory 2 IoCs

Processes:

Client-built(1).exe

description	ioc	process
File created	C:\Program Files\SubDir\Client.exe	Client-built(1).exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built(1).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

Processes:

schtasks.exeschtasks.exe

pid process

4288 schtasks.exe
2036 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built(1).exeClient.exe

description pid process

Token: SeDebugPrivilege 3920 Client-built(1).exe
Token: SeDebugPrivilege 4360 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

4360 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

4360 Client.exe

pid	process
4288	schtasks.exe
2036	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3920	Client-built(1).exe
Token: SeDebugPrivilege	4360	Client.exe

pid	process
4360	Client.exe

pid	process
4360	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built(1).exeClient.exe

description	pid	process	target process
PID 3920 wrote to memory of 4288	3920	Client-built(1).exe	schtasks.exe
PID 3920 wrote to memory of 4288	3920	Client-built(1).exe	schtasks.exe
PID 3920 wrote to memory of 4360	3920	Client-built(1).exe	Client.exe
PID 3920 wrote to memory of 4360	3920	Client-built(1).exe	Client.exe
PID 4360 wrote to memory of 2036	4360	Client.exe	schtasks.exe
PID 4360 wrote to memory of 2036	4360	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\Client-built(1).exe
"C:\Users\Admin\AppData\Local\Temp\Client-built(1).exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3920
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4288
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4360
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2036

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4908

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

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
ef3e3811d92c8c39a9dbfa1b3d0dcece

SHA1
8238396252ae7c164c0bca49163040f236fd5148

SHA256
31ea3fc3712ff925dc56d07e2cae38724e16acd8c1ac719cb5704b4f40da7e55

SHA512
f9941d6b7680bac92de5c5af99ccbd4fca77e207330ec918a5a6c4b73a17ae228f4a53a21f33e5491e591ccd970fa0a0a82abacb926c235650c7702555a20a46

Download Submit
memory/3920-0-0x00007FFBFD203000-0x00007FFBFD205000-memory.dmp

Filesize
8KB

Download
memory/3920-1-0x0000000000D70000-0x0000000001094000-memory.dmp

Filesize
3.1MB

Download
memory/3920-2-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

Filesize
10.8MB

Download
memory/3920-9-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

Filesize
10.8MB

Download
memory/4360-8-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

Filesize
10.8MB

Download
memory/4360-10-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

Filesize
10.8MB

Download
memory/4360-11-0x000000001BD10000-0x000000001BD60000-memory.dmp

Filesize
320KB

Download
memory/4360-12-0x000000001BE20000-0x000000001BED2000-memory.dmp

Filesize
712KB

Download
memory/4360-13-0x00007FFBFD200000-0x00007FFBFDCC1000-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