quasar | 515cf47c5e3294404633bb98b2f50b615af7ab0cf2c3ff1f6675d5d59911e45d

Analysis

max time kernel
1793s
max time network
1798s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
20-05-2024 10:35

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General

Target

Solara.exe
Size

3.1MB
MD5

547f1ce058f078b8a71b2480908efc86
SHA1

8672c0cb7fadabddac6b785dc6a3b6ca801e43f8
SHA256

515cf47c5e3294404633bb98b2f50b615af7ab0cf2c3ff1f6675d5d59911e45d
SHA512

22a47ed6393c3102c78ae259954c3fef3b2ea94ab721c3d2184f9775102d22f81d6893b677e1cd9b10d7e4533ce99a3fc9efd28f2e0c203c2aefa52574bd64c7
SSDEEP

49152:DvnI22SsaNYfdPBldt698dBcjHV7xe1v1LoGlMTHHB72eh2NT:DvI22SsaNYfdPBldt6+dBcjHV7xS

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.178.104:4782

Mutex

e891c020-455f-4321-953c-920a855946ba

Attributes

encryption_key
183636CA2E363ADC2283216B0F563CCDFFEDBD78
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 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4300-1-0x0000000000AD0000-0x0000000000DF4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

924 Client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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

4308 schtasks.exe
3044 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Solara.exeClient.exe

description pid process

Token: SeDebugPrivilege 4300 Solara.exe
Token: SeDebugPrivilege 924 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

924 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

924 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

924 Client.exe

pid	process
924	Client.exe

pid	process
4308	schtasks.exe
3044	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4300	Solara.exe
Token: SeDebugPrivilege	924	Client.exe

pid	process
924	Client.exe

pid	process
924	Client.exe

pid	process
924	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Solara.exeClient.exe

description	pid	process	target process
PID 4300 wrote to memory of 4308	4300	Solara.exe	schtasks.exe
PID 4300 wrote to memory of 4308	4300	Solara.exe	schtasks.exe
PID 4300 wrote to memory of 924	4300	Solara.exe	Client.exe
PID 4300 wrote to memory of 924	4300	Solara.exe	Client.exe
PID 924 wrote to memory of 3044	924	Client.exe	schtasks.exe
PID 924 wrote to memory of 3044	924	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\Solara.exe
"C:\Users\Admin\AppData\Local\Temp\Solara.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4300

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:4308

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 FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:924

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:3044

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

System Information Discovery

T1082

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

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

MD5
547f1ce058f078b8a71b2480908efc86

SHA1
8672c0cb7fadabddac6b785dc6a3b6ca801e43f8

SHA256
515cf47c5e3294404633bb98b2f50b615af7ab0cf2c3ff1f6675d5d59911e45d

SHA512
22a47ed6393c3102c78ae259954c3fef3b2ea94ab721c3d2184f9775102d22f81d6893b677e1cd9b10d7e4533ce99a3fc9efd28f2e0c203c2aefa52574bd64c7

Download Submit
memory/924-9-0x00007FFB82F30000-0x00007FFB839F2000-memory.dmp

Filesize
10.8MB

Download
memory/924-11-0x00007FFB82F30000-0x00007FFB839F2000-memory.dmp

Filesize
10.8MB

Download
memory/924-12-0x000000001CA70000-0x000000001CAC0000-memory.dmp

Filesize
320KB

Download
memory/924-13-0x000000001CB80000-0x000000001CC32000-memory.dmp

Filesize
712KB

Download
memory/924-14-0x00007FFB82F30000-0x00007FFB839F2000-memory.dmp

Filesize
10.8MB

Download
memory/4300-0-0x00007FFB82F33000-0x00007FFB82F35000-memory.dmp

Filesize
8KB

Download
memory/4300-1-0x0000000000AD0000-0x0000000000DF4000-memory.dmp

Filesize
3.1MB

Download
memory/4300-2-0x00007FFB82F30000-0x00007FFB839F2000-memory.dmp

Filesize
10.8MB

Download
memory/4300-10-0x00007FFB82F30000-0x00007FFB839F2000-memory.dmp

Filesize
10.8MB

Download