quasar | f8b020a7d73dd702f0be5c3b77c4de8ee142bd5a3aac3f4ebc64f16fa9715985

General

Target

Client-built.exe
Size

3.1MB
MD5

87c807da5b4a2a646390105dac94bc61
SHA1

597d80ed4349e431c5c059ee655c93a0c68e6528
SHA256

459c4c1fbef1557b5f4ead03465530713785c9cb48e2b365f5affe8e93dbec5f
SHA512

825df40a735987d48d328193260f885294c683c12cbb18ae5d07b889c3b7482a90cd02f05aac2d3c362fa817b6502cbec2ae6f0a6378477a9663ef477408ee9f
SSDEEP

49152:uvtG42pda6D+/PjlLOlg6yQipVAQRJ6abR3LoGdfTHHB72eh2NT:uvE42pda6D+/PjlLOlZyQipVAQRJ60

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.1:4782

88.98.207.207:4782

192.168.1.211:4782

Mutex

6d19d2f9-1235-4b10-a1dd-486dc3edd052

Attributes

encryption_key
12AE26995FE0F312DC3ADA3C8CD142053AD088CA
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 payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2812-1-0x0000000000930000-0x0000000000C54000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/1324-10-0x0000000000D60000-0x0000000001084000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1324 Client.exe
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1496 schtasks.exe
2536 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2812 Client-built.exe
Token: SeDebugPrivilege 1324 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1324 Client.exe

pid	process
1324	Client.exe

pid	process
1496	schtasks.exe
2536	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2812	Client-built.exe
Token: SeDebugPrivilege	1324	Client.exe

pid	process
1324	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2812 wrote to memory of 1496	2812	Client-built.exe	schtasks.exe
PID 2812 wrote to memory of 1496	2812	Client-built.exe	schtasks.exe
PID 2812 wrote to memory of 1496	2812	Client-built.exe	schtasks.exe
PID 2812 wrote to memory of 1324	2812	Client-built.exe	Client.exe
PID 2812 wrote to memory of 1324	2812	Client-built.exe	Client.exe
PID 2812 wrote to memory of 1324	2812	Client-built.exe	Client.exe
PID 1324 wrote to memory of 2536	1324	Client.exe	schtasks.exe
PID 1324 wrote to memory of 2536	1324	Client.exe	schtasks.exe
PID 1324 wrote to memory of 2536	1324	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.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2812

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⤵
- Creates scheduled task(s)
PID:1496

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:1324

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⤵
- Creates scheduled task(s)
PID:2536

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
3.1MB

MD5
87c807da5b4a2a646390105dac94bc61

SHA1
597d80ed4349e431c5c059ee655c93a0c68e6528

SHA256
459c4c1fbef1557b5f4ead03465530713785c9cb48e2b365f5affe8e93dbec5f

SHA512
825df40a735987d48d328193260f885294c683c12cbb18ae5d07b889c3b7482a90cd02f05aac2d3c362fa817b6502cbec2ae6f0a6378477a9663ef477408ee9f

Download Submit
memory/1324-9-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Filesize
9.9MB

Download
memory/1324-10-0x0000000000D60000-0x0000000001084000-memory.dmp

Filesize
3.1MB

Download
memory/1324-11-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Filesize
9.9MB

Download
memory/1324-12-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Filesize
9.9MB

Download
memory/1324-13-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-0-0x000007FEF53D3000-0x000007FEF53D4000-memory.dmp

Filesize
4KB

Download
memory/2812-1-0x0000000000930000-0x0000000000C54000-memory.dmp

Filesize
3.1MB

Download
memory/2812-2-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-8-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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