quasar | f8f2be9448bb64d2d67b6b9f724e5668a1584831aece7d49f9956b283aca77be

General

Target

Client-built3.exe
Size

3.1MB
MD5

0ba12b4cf0e785325ef57b8addc70899
SHA1

6ebc9ef072f738e0d89a286f08e359ceacff0095
SHA256

f8f2be9448bb64d2d67b6b9f724e5668a1584831aece7d49f9956b283aca77be
SHA512

5badb694a5318058f8d016258bc8c50886e8ebf753b97a95116dfb66e39061297ede0228aa9fa95b3f0614d70326aafb0f8bad4318993ef05f288e4a249a6889
SSDEEP

49152:WvcG42pda6D+/PjlLOlg6yQipVnVmcmzgHoGdMTHHB72eh2NT:Wvn42pda6D+/PjlLOlZyQipVnVm2

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.127.0.200:4782

Mutex

fffe048b-d25a-4851-bd46-4583f63bcae9

Attributes

encryption_key
433895AE7B4C5D8EF94D36D167293A1C1914DBFB
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

Processes:

resource	yara_rule
behavioral1/memory/2132-1-0x0000000000390000-0x00000000006B4000-memory.dmp	family_quasar
behavioral1/files/0x000700000001867d-5.dat	family_quasar
behavioral1/memory/1704-8-0x0000000000F00000-0x0000000001224000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
1704	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

Processes:

schtasks.exeschtasks.exe

pid	Process
2420	schtasks.exe
1692	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built3.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2132	Client-built3.exe
Token: SeDebugPrivilege	1704	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid	Process
1704	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid	Process
1704	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built3.exeClient.exe

description	pid	Process	procid_target
PID 2132 wrote to memory of 2420	2132	Client-built3.exe	30
PID 2132 wrote to memory of 2420	2132	Client-built3.exe	30
PID 2132 wrote to memory of 2420	2132	Client-built3.exe	30
PID 2132 wrote to memory of 1704	2132	Client-built3.exe	32
PID 2132 wrote to memory of 1704	2132	Client-built3.exe	32
PID 2132 wrote to memory of 1704	2132	Client-built3.exe	32
PID 1704 wrote to memory of 1692	1704	Client.exe	33
PID 1704 wrote to memory of 1692	1704	Client.exe	33
PID 1704 wrote to memory of 1692	1704	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-built3.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built3.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2132
- 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:2420
- 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:1704
- - 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:1692

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
0ba12b4cf0e785325ef57b8addc70899

SHA1
6ebc9ef072f738e0d89a286f08e359ceacff0095

SHA256
f8f2be9448bb64d2d67b6b9f724e5668a1584831aece7d49f9956b283aca77be

SHA512
5badb694a5318058f8d016258bc8c50886e8ebf753b97a95116dfb66e39061297ede0228aa9fa95b3f0614d70326aafb0f8bad4318993ef05f288e4a249a6889

Download Submit
memory/1704-8-0x0000000000F00000-0x0000000001224000-memory.dmp

Filesize
3.1MB

Download
memory/1704-10-0x000007FEF5190000-0x000007FEF5B7C000-memory.dmp

Filesize
9.9MB

Download
memory/1704-9-0x000007FEF5190000-0x000007FEF5B7C000-memory.dmp

Filesize
9.9MB

Download
memory/1704-11-0x000007FEF5190000-0x000007FEF5B7C000-memory.dmp

Filesize
9.9MB

Download
memory/2132-0-0x000007FEF5193000-0x000007FEF5194000-memory.dmp

Filesize
4KB

Download
memory/2132-1-0x0000000000390000-0x00000000006B4000-memory.dmp

Filesize
3.1MB

Download
memory/2132-2-0x000007FEF5190000-0x000007FEF5B7C000-memory.dmp

Filesize
9.9MB

Download
memory/2132-7-0x000007FEF5190000-0x000007FEF5B7C000-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