quasar | 5fccda50065844a012e1425d3d9d60b608c6d5dc07514d32d04b1c55a1eade36

General

Target

PC_Booster.exe
Size

3.1MB
MD5

81d8571af28e42e2bbe60b5118173da6
SHA1

a826876a268bb7ebcf67b050707ff8a8e05ee6ef
SHA256

5fccda50065844a012e1425d3d9d60b608c6d5dc07514d32d04b1c55a1eade36
SHA512

b6f2dc77b046e4577a996495a6a5589f6ea263e61570ff362f2fb3386dc2b5c80c63ee6ab0678b36e1e11f7a3e46a9c5ed2cf33a5fb523e6afaed0f5a38da347
SSDEEP

49152:KvyI22SsaNYfdPBldt698dBcjHF9rwmCPLoGZB3voTHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHF9rQ

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.18:4782

Mutex

4d099eab-30e3-4c3b-bf50-bf77e2e70e0f

Attributes

encryption_key
04E6B8EB331AA0F74187E430ADEDBC1B79B631E4
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/2260-1-0x0000000001250000-0x0000000001574000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2208-9-0x0000000000950000-0x0000000000C74000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2208 Client.exe
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

2536 schtasks.exe
2888 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

PC_Booster.exeClient.exe

description pid process

Token: SeDebugPrivilege 2260 PC_Booster.exe
Token: SeDebugPrivilege 2208 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2208 Client.exe

pid	process
2208	Client.exe

pid	process
2536	schtasks.exe
2888	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2260	PC_Booster.exe
Token: SeDebugPrivilege	2208	Client.exe

pid	process
2208	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

PC_Booster.exeClient.exe

description	pid	process	target process
PID 2260 wrote to memory of 2536	2260	PC_Booster.exe	schtasks.exe
PID 2260 wrote to memory of 2536	2260	PC_Booster.exe	schtasks.exe
PID 2260 wrote to memory of 2536	2260	PC_Booster.exe	schtasks.exe
PID 2260 wrote to memory of 2208	2260	PC_Booster.exe	Client.exe
PID 2260 wrote to memory of 2208	2260	PC_Booster.exe	Client.exe
PID 2260 wrote to memory of 2208	2260	PC_Booster.exe	Client.exe
PID 2208 wrote to memory of 2888	2208	Client.exe	schtasks.exe
PID 2208 wrote to memory of 2888	2208	Client.exe	schtasks.exe
PID 2208 wrote to memory of 2888	2208	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\PC_Booster.exe
"C:\Users\Admin\AppData\Local\Temp\PC_Booster.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2260
- 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:2536
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2208
- - 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:2888

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

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
81d8571af28e42e2bbe60b5118173da6

SHA1
a826876a268bb7ebcf67b050707ff8a8e05ee6ef

SHA256
5fccda50065844a012e1425d3d9d60b608c6d5dc07514d32d04b1c55a1eade36

SHA512
b6f2dc77b046e4577a996495a6a5589f6ea263e61570ff362f2fb3386dc2b5c80c63ee6ab0678b36e1e11f7a3e46a9c5ed2cf33a5fb523e6afaed0f5a38da347

Download Submit
memory/2208-10-0x000007FEF58E0000-0x000007FEF62CC000-memory.dmp

Filesize
9.9MB

Download
memory/2208-9-0x0000000000950000-0x0000000000C74000-memory.dmp

Filesize
3.1MB

Download
memory/2208-11-0x000007FEF58E0000-0x000007FEF62CC000-memory.dmp

Filesize
9.9MB

Download
memory/2208-12-0x000007FEF58E0000-0x000007FEF62CC000-memory.dmp

Filesize
9.9MB

Download
memory/2260-0-0x000007FEF58E3000-0x000007FEF58E4000-memory.dmp

Filesize
4KB

Download
memory/2260-1-0x0000000001250000-0x0000000001574000-memory.dmp

Filesize
3.1MB

Download
memory/2260-2-0x000007FEF58E0000-0x000007FEF62CC000-memory.dmp

Filesize
9.9MB

Download
memory/2260-8-0x000007FEF58E0000-0x000007FEF62CC000-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