quasar | ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d

General

Target

Client-buailt.exe
Size

3.3MB
MD5

67058a89ce6f3786bc28af9962d6202d
SHA1

57b66752526058f244ed0802d771b0b4d70432a9
SHA256

ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d
SHA512

98a0cc78d49cba94cc5edd2804697391861cd0192ce10aeb93223ad05046a1418d1380c3a3cd7a1e17f0ab290e0a10cd60d3f0e8959ca4783d2eef7460a8ce62
SSDEEP

49152:qv+I22SsaNYfdPBldt698dBcjHQfnk9hbvJULoGdP7bTHHB72eh2NT/ZqS:qvz22SsaNYfdPBldt6+dBcjHBhA

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

198.7.62.204:4782

192.168.1.1:4782

Mutex

02b9c972-8b55-4d55-b7c4-09a1f00ff400

Attributes

encryption_key
5BF0703F288C43118835CAF4D1A6879C29016FB3
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/2156-0-0x0000000000DE0000-0x0000000001128000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\Client.exe	family_quasar
behavioral1/memory/2812-8-0x0000000001070000-0x00000000013B8000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2812 Client.exe

pid	process
2812	Client.exe

Drops file in System32 directory 5 IoCs

Processes:

Client-buailt.exeClient.exe

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

2572 schtasks.exe
2824 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-buailt.exeClient.exe

description pid process

Token: SeDebugPrivilege 2156 Client-buailt.exe
Token: SeDebugPrivilege 2812 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2812 Client.exe

pid	process
2572	schtasks.exe
2824	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2156	Client-buailt.exe
Token: SeDebugPrivilege	2812	Client.exe

pid	process
2812	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-buailt.exeClient.exe

description	pid	process	target process
PID 2156 wrote to memory of 2572	2156	Client-buailt.exe	schtasks.exe
PID 2156 wrote to memory of 2572	2156	Client-buailt.exe	schtasks.exe
PID 2156 wrote to memory of 2572	2156	Client-buailt.exe	schtasks.exe
PID 2156 wrote to memory of 2812	2156	Client-buailt.exe	Client.exe
PID 2156 wrote to memory of 2812	2156	Client-buailt.exe	Client.exe
PID 2156 wrote to memory of 2812	2156	Client-buailt.exe	Client.exe
PID 2812 wrote to memory of 2824	2812	Client.exe	schtasks.exe
PID 2812 wrote to memory of 2824	2812	Client.exe	schtasks.exe
PID 2812 wrote to memory of 2824	2812	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-buailt.exe
"C:\Users\Admin\AppData\Local\Temp\Client-buailt.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2156

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2572

C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2812

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2824

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:\Windows\System32\SubDir\Client.exe
Filesize
3.3MB

MD5
67058a89ce6f3786bc28af9962d6202d

SHA1
57b66752526058f244ed0802d771b0b4d70432a9

SHA256
ee1544b6bb0a35c74391f821b94208443754ac5f7e01f03bc369eac3dd70b32d

SHA512
98a0cc78d49cba94cc5edd2804697391861cd0192ce10aeb93223ad05046a1418d1380c3a3cd7a1e17f0ab290e0a10cd60d3f0e8959ca4783d2eef7460a8ce62

Download Submit
memory/2156-0-0x0000000000DE0000-0x0000000001128000-memory.dmp

Filesize
3.3MB

Download
memory/2156-1-0x000007FEF5BE0000-0x000007FEF65CC000-memory.dmp

Filesize
9.9MB

Download
memory/2156-2-0x000000001B2C0000-0x000000001B340000-memory.dmp

Filesize
512KB

Download
memory/2156-11-0x000007FEF5BE0000-0x000007FEF65CC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-9-0x000007FEF5BE0000-0x000007FEF65CC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-8-0x0000000001070000-0x00000000013B8000-memory.dmp

Filesize
3.3MB

Download
memory/2812-10-0x000000001B330000-0x000000001B3B0000-memory.dmp

Filesize
512KB

Download
memory/2812-12-0x000007FEF5BE0000-0x000007FEF65CC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-13-0x000000001B330000-0x000000001B3B0000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads