quasar | e358e8eff32f6c6ec1e95e04e0573023856c6e2625dd4b0aa28739a49c4f9e17

General

Target

Client-built.exe
Size

3.1MB
MD5

b1c7e0c32b9e9daf61e6cafc7e983379
SHA1

3a6c799ce6fcf5d6c3e72ebabdc2ad37b1c7fcde
SHA256

e358e8eff32f6c6ec1e95e04e0573023856c6e2625dd4b0aa28739a49c4f9e17
SHA512

452a26a27327082764fb3d0b31412686e59429742a0ea6b7be4762d41e19abcc330c675a4fae143c295cd9796b9a612521c96244cef0442fa9ae4722c08dca20
SSDEEP

49152:rv3I22SsaNYfdPBldt698dBcjHWQxNESEyk/icLoGd9THHB72eh2NT:rv422SsaNYfdPBldt6+dBcjHpxRi

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

ubxn6j9dc.localto.net:2424

Mutex

7a517489-e7aa-4d3a-8bac-14c016a258fe

Attributes

encryption_key
A896862809BEA850DB21D754E127B53DD347664D
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/1836-1-0x0000000000290000-0x00000000005B4000-memory.dmp	family_quasar
behavioral1/files/0x000f000000018683-6.dat	family_quasar
behavioral1/memory/2860-7-0x0000000001160000-0x0000000001484000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2860	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
1892	schtasks.exe
2520	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1836	Client-built.exe
Token: SeDebugPrivilege	2860	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2860	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2860	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1836 wrote to memory of 1892	1836	Client-built.exe	30
PID 1836 wrote to memory of 1892	1836	Client-built.exe	30
PID 1836 wrote to memory of 1892	1836	Client-built.exe	30
PID 1836 wrote to memory of 2860	1836	Client-built.exe	32
PID 1836 wrote to memory of 2860	1836	Client-built.exe	32
PID 1836 wrote to memory of 2860	1836	Client-built.exe	32
PID 2860 wrote to memory of 2520	2860	Client.exe	34
PID 2860 wrote to memory of 2520	2860	Client.exe	34
PID 2860 wrote to memory of 2520	2860	Client.exe	34

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:1836
- 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:1892
- 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 WriteProcessMemory
  PID:2860
- - 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:2520

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
b1c7e0c32b9e9daf61e6cafc7e983379

SHA1
3a6c799ce6fcf5d6c3e72ebabdc2ad37b1c7fcde

SHA256
e358e8eff32f6c6ec1e95e04e0573023856c6e2625dd4b0aa28739a49c4f9e17

SHA512
452a26a27327082764fb3d0b31412686e59429742a0ea6b7be4762d41e19abcc330c675a4fae143c295cd9796b9a612521c96244cef0442fa9ae4722c08dca20

Download Submit
memory/1836-0-0x000007FEF57B3000-0x000007FEF57B4000-memory.dmp

Filesize
4KB

Download
memory/1836-1-0x0000000000290000-0x00000000005B4000-memory.dmp

Filesize
3.1MB

Download
memory/1836-2-0x000007FEF57B0000-0x000007FEF619C000-memory.dmp

Filesize
9.9MB

Download
memory/1836-8-0x000007FEF57B0000-0x000007FEF619C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-7-0x0000000001160000-0x0000000001484000-memory.dmp

Filesize
3.1MB

Download
memory/2860-9-0x000007FEF57B0000-0x000007FEF619C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-10-0x000007FEF57B0000-0x000007FEF619C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-11-0x000007FEF57B0000-0x000007FEF619C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads