quasar | e041e66e2ae3d5f3788712173628f211d4ac597071a9724035655e3d5812f632

General

Target

Client-built.exe
Size

3.1MB
MD5

afbe43a1d3e9986c5a72a9d7dc2db574
SHA1

21ef2f45fd401a680094ee78d4429338aebd53fa
SHA256

e041e66e2ae3d5f3788712173628f211d4ac597071a9724035655e3d5812f632
SHA512

03d734318c8fff5a3a6d30601bcfd35f6ce95f8a32f7f095f103464551b7afdaf22f3a98aaa1ac7c35a53058db85455250d9ecfcb65521de138f88377c80b5a4
SSDEEP

49152:/vblL26AaNeWgPhlmVqvMQ7XSKCkbQMoGdv5THHB72eh2NT:/vBL26AaNeWgPhlmVqkQ7XSKCkbd

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

traffic-appointed.gl.at.ply.gg:15980

Mutex

a1cf046f-88d0-4438-ba9e-206f45ca6749

Attributes

encryption_key
F426A0AAE097F6C161D9B012687B93AED480E211
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 3 IoCs

resource	yara_rule
behavioral1/memory/2364-1-0x0000000000BE0000-0x0000000000F04000-memory.dmp	family_quasar
behavioral1/files/0x003600000001706d-5.dat	family_quasar
behavioral1/memory/2916-8-0x0000000000CD0000-0x0000000000FF4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2916	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
2756	schtasks.exe
2796	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2364	Client-built.exe
Token: SeDebugPrivilege	2916	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2916	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2916	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2916	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2364 wrote to memory of 2756	2364	Client-built.exe	30
PID 2364 wrote to memory of 2756	2364	Client-built.exe	30
PID 2364 wrote to memory of 2756	2364	Client-built.exe	30
PID 2364 wrote to memory of 2916	2364	Client-built.exe	32
PID 2364 wrote to memory of 2916	2364	Client-built.exe	32
PID 2364 wrote to memory of 2916	2364	Client-built.exe	32
PID 2916 wrote to memory of 2796	2916	Client.exe	33
PID 2916 wrote to memory of 2796	2916	Client.exe	33
PID 2916 wrote to memory of 2796	2916	Client.exe	33

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:2364
- 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:2756
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2916
- - 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:2796

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:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
afbe43a1d3e9986c5a72a9d7dc2db574

SHA1
21ef2f45fd401a680094ee78d4429338aebd53fa

SHA256
e041e66e2ae3d5f3788712173628f211d4ac597071a9724035655e3d5812f632

SHA512
03d734318c8fff5a3a6d30601bcfd35f6ce95f8a32f7f095f103464551b7afdaf22f3a98aaa1ac7c35a53058db85455250d9ecfcb65521de138f88377c80b5a4

Download Submit
memory/2364-0-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

Filesize
4KB

Download
memory/2364-1-0x0000000000BE0000-0x0000000000F04000-memory.dmp

Filesize
3.1MB

Download
memory/2364-2-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2364-9-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2916-7-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2916-8-0x0000000000CD0000-0x0000000000FF4000-memory.dmp

Filesize
3.1MB

Download
memory/2916-10-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2916-11-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads