quasar | 3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515b

Analysis

max time kernel
102s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
06/12/2024, 10:57

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General

Target
3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe
Size 3.1MB
Sample241206-m2e13atpcz
SHA256 3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515b
MD5 ab02937fb8fc8ccce7853d22fe9ff280
SHA1 cf180eba95b42bcf3ff80ed3e2922d7805ec1f72
SHA512 7fd897a2f658181fd68cc036069c20f7a25afb92d07684005085b68d1f7e96dcb84688f0b8132ca0c200c2d0ac698e6a52014a0b8c8ea2bfe4b314c4756ee1b5
SSDEEP 49152:Vvht62XlaSFNWPjljiFa2RoUYIdqWhybRjPLoGddJfTHHB72eh2NT:VvL62XlaSFNWPjljiFXRoUYIdqWhWT
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.17:5555

Mutex

3b1732e2-6a81-44bb-8d99-4472451b1cf3

Attributes

encryption_key
871AD53C1EE1C8F197D53D3E1DCA45CC62B82B8D
install_name
javaconfig.exe
log_directory
Logs
reconnect_delay
3000
startup_key
JavaUpdater
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/548-1-0x00000000007A0000-0x0000000000AC6000-memory.dmp	family_quasar
behavioral2/files/0x000d000000023a69-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
932	javaconfig.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

pid	Process
4676	schtasks.exe
3452	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	548	3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe
Token: SeDebugPrivilege	932	javaconfig.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
932	javaconfig.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
932	javaconfig.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
932	javaconfig.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 548 wrote to memory of 4676	548	3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe	84
PID 548 wrote to memory of 4676	548	3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe	84
PID 548 wrote to memory of 932	548	3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe	86
PID 548 wrote to memory of 932	548	3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe	86
PID 932 wrote to memory of 3452	932	javaconfig.exe	87
PID 932 wrote to memory of 3452	932	javaconfig.exe	87

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\3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe
"C:\Users\Admin\AppData\Local\Temp\3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515bN.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:548
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "JavaUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4676
- C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.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:932
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "JavaUpdater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3452

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

javaconfig.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\javaconfig.exe
Size 3.1MB
SHA256 3a3a281e6488b98895402f29a3756463f018ca96b4ebfcfee43e6e7d71e1515b
MD5 ab02937fb8fc8ccce7853d22fe9ff280
SHA1 cf180eba95b42bcf3ff80ed3e2922d7805ec1f72
SHA512 7fd897a2f658181fd68cc036069c20f7a25afb92d07684005085b68d1f7e96dcb84688f0b8132ca0c200c2d0ac698e6a52014a0b8c8ea2bfe4b314c4756ee1b5
SSDEEP 49152:Vvht62XlaSFNWPjljiFa2RoUYIdqWhybRjPLoGddJfTHHB72eh2NT:VvL62XlaSFNWPjljiFXRoUYIdqWhWT
MD5 SHA1 SHA512 SSDEEP

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memory/548-0-0x00007FF9F5A73000-0x00007FF9F5A75000-memory.dmp

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memory/548-1-0x00000000007A0000-0x0000000000AC6000-memory.dmp

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memory/548-2-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

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memory/548-9-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

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memory/932-10-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

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memory/932-11-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

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memory/932-12-0x000000001B2A0000-0x000000001B2F0000-memory.dmp

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memory/932-13-0x000000001BC20000-0x000000001BCD2000-memory.dmp

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memory/932-14-0x00007FF9F5A70000-0x00007FF9F6531000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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