quasar | 566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
15-05-2024 17:34

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General

Target

client.exe
Size

3.1MB
MD5

4a603ec4e3c5a21400eaabac7c6401c6
SHA1

23b446721eacd0b6796407ca20bd1e01355ab41f
SHA256

566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c
SHA512

070a5dd14bce16ba58eb65f3b3143fc7890f0e34f2ed7f3a1930e3fa8454ebcf615b43c819f16f4fc494676443bd409a3a57e8fe6e8f39ab02df5ace497eaea0
SSDEEP

49152:rvrI22SsaNYfdPBldt698dBcjHLCc1J2LoGdcTHHB72eh2NT:rvU22SsaNYfdPBldt6+dBcjHLCn

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

79.132.193.215:4782

Mutex

f99ccef5-65c4-4972-adf2-fb38921cc9fc

Attributes

encryption_key
1C15E91ACCFAC60B043A1336CF6912EA8572BA83
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2336-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp	family_quasar
C:\Windows\system32\Client.exe	family_quasar
behavioral2/memory/2024-8-0x0000000000E20000-0x0000000001144000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2024 Client.exe
Drops file in System32 directory 2 IoCs

Processes:

client.exe

description ioc process

File created C:\Windows\system32\Client.exe client.exe
File opened for modification C:\Windows\system32\Client.exe client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

client.exeClient.exe

description pid process

Token: SeDebugPrivilege 2336 client.exe
Token: SeDebugPrivilege 2024 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

2024 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

2024 Client.exe

pid	process
2024	Client.exe

description	ioc	process
File created	C:\Windows\system32\Client.exe	client.exe
File opened for modification	C:\Windows\system32\Client.exe	client.exe

description	pid	process
Token: SeDebugPrivilege	2336	client.exe
Token: SeDebugPrivilege	2024	Client.exe

pid	process
2024	Client.exe

pid	process
2024	Client.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

client.exe

description	pid	process	target process
PID 2336 wrote to memory of 2024	2336	client.exe	Client.exe
PID 2336 wrote to memory of 2024	2336	client.exe	Client.exe
PID 2336 wrote to memory of 2024	2336	client.exe	Client.exe

C:\Users\Admin\AppData\Local\Temp\client.exe
"C:\Users\Admin\AppData\Local\Temp\client.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2336

C:\Windows\system32\Client.exe
"C:\Windows\system32\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:2024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\system32\Client.exe

Filesize
3.1MB

MD5
4a603ec4e3c5a21400eaabac7c6401c6

SHA1
23b446721eacd0b6796407ca20bd1e01355ab41f

SHA256
566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c

SHA512
070a5dd14bce16ba58eb65f3b3143fc7890f0e34f2ed7f3a1930e3fa8454ebcf615b43c819f16f4fc494676443bd409a3a57e8fe6e8f39ab02df5ace497eaea0

Download Submit
memory/2024-8-0x0000000000E20000-0x0000000001144000-memory.dmp

Filesize
3.1MB

Download
memory/2024-7-0x000007FEF54C0000-0x000007FEF5EAC000-memory.dmp

Filesize
9.9MB

Download
memory/2024-10-0x000007FEF54C0000-0x000007FEF5EAC000-memory.dmp

Filesize
9.9MB

Download
memory/2024-11-0x000007FEF54C0000-0x000007FEF5EAC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-0-0x000007FEF54C3000-0x000007FEF54C4000-memory.dmp

Filesize
4KB

Download
memory/2336-1-0x00000000009B0000-0x0000000000CD4000-memory.dmp

Filesize
3.1MB

Download
memory/2336-2-0x000007FEF54C0000-0x000007FEF5EAC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-9-0x000007FEF54C0000-0x000007FEF5EAC000-memory.dmp

Filesize
9.9MB

Download