quasar | d91cfd3cae8c9fe75b7756d1fd986c1f952fbde751e2005cd8a1b44feec18100

Analysis

max time kernel
149s
max time network
135s
platform
windows7_x64
resource
win7-20240215-en
resource tags

arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
submitted
02-06-2024 23:23

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General

Target

e/Client-built.exe
Size

3.1MB
MD5

aa577b65aef014d53b006d781d104ef6
SHA1

318e06013bbfcfdd14f4e21aa2540f1f1dfe0039
SHA256

242351aa410188e74858d60f04973bf05071b98e82f6494d2ba1851d23fdf178
SHA512

45649bade97928524c7b1e6d456f7abe2036fe33775ac4308c786bd3a8d1ce68ce7ff12dbddb4c80b8d3c28324b13ec37e0ec72c856ce15c32e0724952deace5
SSDEEP

49152:Hv+lL26AaNeWgPhlmVqvMQ7XSKXXxNESEdk/iKLoGdYTHHB72eh2NT:HvuL26AaNeWgPhlmVqkQ7XSKnx80

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.1:4782

88.98.207.207:4782

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/1268-1-0x0000000000D90000-0x00000000010B4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/3060-9-0x0000000000830000-0x0000000000B54000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

3060 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

2244 schtasks.exe
2664 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 1268 Client-built.exe
Token: SeDebugPrivilege 3060 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

3060 Client.exe

pid	process
3060	Client.exe

pid	process
2244	schtasks.exe
2664	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1268	Client-built.exe
Token: SeDebugPrivilege	3060	Client.exe

pid	process
3060	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 1268 wrote to memory of 2244	1268	Client-built.exe	schtasks.exe
PID 1268 wrote to memory of 2244	1268	Client-built.exe	schtasks.exe
PID 1268 wrote to memory of 2244	1268	Client-built.exe	schtasks.exe
PID 1268 wrote to memory of 3060	1268	Client-built.exe	Client.exe
PID 1268 wrote to memory of 3060	1268	Client-built.exe	Client.exe
PID 1268 wrote to memory of 3060	1268	Client-built.exe	Client.exe
PID 3060 wrote to memory of 2664	3060	Client.exe	schtasks.exe
PID 3060 wrote to memory of 2664	3060	Client.exe	schtasks.exe
PID 3060 wrote to memory of 2664	3060	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\e\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\e\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1268

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:2244

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:3060

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:2664

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

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
aa577b65aef014d53b006d781d104ef6

SHA1
318e06013bbfcfdd14f4e21aa2540f1f1dfe0039

SHA256
242351aa410188e74858d60f04973bf05071b98e82f6494d2ba1851d23fdf178

SHA512
45649bade97928524c7b1e6d456f7abe2036fe33775ac4308c786bd3a8d1ce68ce7ff12dbddb4c80b8d3c28324b13ec37e0ec72c856ce15c32e0724952deace5

Download Submit
memory/1268-0-0x000007FEF5883000-0x000007FEF5884000-memory.dmp

Filesize
4KB

Download
memory/1268-1-0x0000000000D90000-0x00000000010B4000-memory.dmp

Filesize
3.1MB

Download
memory/1268-2-0x000007FEF5880000-0x000007FEF626C000-memory.dmp

Filesize
9.9MB

Download
memory/1268-10-0x000007FEF5880000-0x000007FEF626C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-8-0x000007FEF5880000-0x000007FEF626C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-9-0x0000000000830000-0x0000000000B54000-memory.dmp

Filesize
3.1MB

Download
memory/3060-11-0x000007FEF5880000-0x000007FEF626C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-12-0x000007FEF5880000-0x000007FEF626C000-memory.dmp

Filesize
9.9MB

Download