quasar | 0b0f5f4a1afe5fc657325c8286e311c4b81a5ce7a516486b36ef7e5980dd120e

Analysis

max time kernel
591s
max time network
601s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
30-06-2024 14:27

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General

Target

DriverInstall.exe
Size

3.1MB
MD5

2428d390c58c3ce2390bf4f6a00f27f2
SHA1

525322b7d43603e80d9d5c062baa9a1c4eb8c66f
SHA256

0b0f5f4a1afe5fc657325c8286e311c4b81a5ce7a516486b36ef7e5980dd120e
SHA512

d0a682e2b529e48b9f28fbef6d56c850c7a21ce03858755b28f4abe7ced2af6337f7b45e83f081faa37627f2e3d8a1dac46c3b75624478ed5f4ab33219e484b6
SSDEEP

49152:GvUt62XlaSFNWPjljiFa2RoUYIi3xh1v4LoGf7mTHHB72eh2NT:GvI62XlaSFNWPjljiFXRoUYIi3xK

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.178.86:4782

Mutex

bcb4ded3-f479-4472-930f-985b13a156fc

Attributes

encryption_key
E65A63C5070648ABDC8CAD5F2CB118AA164CFD24
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Driver.exe
subdirectory
WOW646464

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar payload 2 IoCs

Processes:

resource yara_rule

behavioral1/memory/3932-1-0x0000000000E50000-0x0000000001174000-memory.dmp family_quasar
C:\Windows\system32\WOW646464\Client.exe family_quasar
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

3540 Client.exe

resource	yara_rule
behavioral1/memory/3932-1-0x0000000000E50000-0x0000000001174000-memory.dmp	family_quasar
C:\Windows\system32\WOW646464\Client.exe	family_quasar

pid	process
3540	Client.exe

Drops file in System32 directory 5 IoCs

Processes:

DriverInstall.exeClient.exe

description	ioc	process
File opened for modification	C:\Windows\system32\WOW646464	DriverInstall.exe
File opened for modification	C:\Windows\system32\WOW646464\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\WOW646464	Client.exe
File created	C:\Windows\system32\WOW646464\Client.exe	DriverInstall.exe
File opened for modification	C:\Windows\system32\WOW646464\Client.exe	DriverInstall.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

1464 schtasks.exe
4436 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

DriverInstall.exeClient.exe

description pid process

Token: SeDebugPrivilege 3932 DriverInstall.exe
Token: SeDebugPrivilege 3540 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

3540 Client.exe

pid	process
1464	schtasks.exe
4436	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3932	DriverInstall.exe
Token: SeDebugPrivilege	3540	Client.exe

pid	process
3540	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

DriverInstall.exeClient.exe

description	pid	process	target process
PID 3932 wrote to memory of 1464	3932	DriverInstall.exe	schtasks.exe
PID 3932 wrote to memory of 1464	3932	DriverInstall.exe	schtasks.exe
PID 3932 wrote to memory of 3540	3932	DriverInstall.exe	Client.exe
PID 3932 wrote to memory of 3540	3932	DriverInstall.exe	Client.exe
PID 3540 wrote to memory of 4436	3540	Client.exe	schtasks.exe
PID 3540 wrote to memory of 4436	3540	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\DriverInstall.exe
"C:\Users\Admin\AppData\Local\Temp\DriverInstall.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3932

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Driver.exe" /sc ONLOGON /tr "C:\Windows\system32\WOW646464\Client.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:1464

C:\Windows\system32\WOW646464\Client.exe
"C:\Windows\system32\WOW646464\Client.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3540

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Driver.exe" /sc ONLOGON /tr "C:\Windows\system32\WOW646464\Client.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:4436

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads

C:\Windows\system32\WOW646464\Client.exe
Filesize
3.1MB

MD5
2428d390c58c3ce2390bf4f6a00f27f2

SHA1
525322b7d43603e80d9d5c062baa9a1c4eb8c66f

SHA256
0b0f5f4a1afe5fc657325c8286e311c4b81a5ce7a516486b36ef7e5980dd120e

SHA512
d0a682e2b529e48b9f28fbef6d56c850c7a21ce03858755b28f4abe7ced2af6337f7b45e83f081faa37627f2e3d8a1dac46c3b75624478ed5f4ab33219e484b6

Download Submit
memory/3540-10-0x00007FFB360B0000-0x00007FFB36B72000-memory.dmp

Filesize
10.8MB

Download
memory/3540-11-0x00007FFB360B0000-0x00007FFB36B72000-memory.dmp

Filesize
10.8MB

Download
memory/3540-12-0x00000000027A0000-0x00000000027F0000-memory.dmp

Filesize
320KB

Download
memory/3540-13-0x000000001B910000-0x000000001B9C2000-memory.dmp

Filesize
712KB

Download
memory/3540-14-0x000000001C100000-0x000000001C628000-memory.dmp

Filesize
5.2MB

Download
memory/3540-15-0x00007FFB360B0000-0x00007FFB36B72000-memory.dmp

Filesize
10.8MB

Download
memory/3540-16-0x00007FFB360B0000-0x00007FFB36B72000-memory.dmp

Filesize
10.8MB

Download
memory/3932-0-0x00007FFB360B3000-0x00007FFB360B5000-memory.dmp

Filesize
8KB

Download
memory/3932-1-0x0000000000E50000-0x0000000001174000-memory.dmp

Filesize
3.1MB

Download
memory/3932-2-0x00007FFB360B0000-0x00007FFB36B72000-memory.dmp

Filesize
10.8MB

Download
memory/3932-9-0x00007FFB360B0000-0x00007FFB36B72000-memory.dmp

Filesize
10.8MB

Download